drivers/usb/core/devio.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*****************************************************************************/
   3
   4 /*
   5  *      devio.c  --  User space communication with USB devices.
   6  *
   7  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   8  *
   9  *  This file implements the usbfs/x/y files, where
  10  *  x is the bus number and y the device number.
  11  *
  12  *  It allows user space programs/"drivers" to communicate directly
  13  *  with USB devices without intervening kernel driver.
  14  *
  15  *  Revision history
  16  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  17  *    04.01.2000   0.2   Turned into its own filesystem
  18  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  19  *                       (CAN-2005-3055)
  20  */
  21
  22 /*****************************************************************************/
  23
  24 #include <linux/fs.h>
  25 #include <linux/mm.h>
  26 #include <linux/sched/signal.h>
  27 #include <linux/slab.h>
  28 #include <linux/signal.h>
  29 #include <linux/poll.h>
  30 #include <linux/module.h>
  31 #include <linux/string.h>
  32 #include <linux/usb.h>
  33 #include <linux/usbdevice_fs.h>
  34 #include <linux/usb/hcd.h>      /* for usbcore internals */
  35 #include <linux/cdev.h>
  36 #include <linux/notifier.h>
  37 #include <linux/security.h>
  38 #include <linux/user_namespace.h>
  39 #include <linux/scatterlist.h>
  40 #include <linux/uaccess.h>
  41 #include <linux/dma-mapping.h>
  42 #include <asm/byteorder.h>
  43 #include <linux/moduleparam.h>
  44
  45 #include "usb.h"
  46
  47 #define USB_MAXBUS                      64
  48 #define USB_DEVICE_MAX                  (USB_MAXBUS * 128)
  49 #define USB_SG_SIZE                     16384 /* split-size for large txs */
  50
  51 struct usb_dev_state {
  52         struct list_head list;      /* state list */
  53         struct usb_device *dev;
  54         struct file *file;
  55         spinlock_t lock;            /* protects the async urb lists */
  56         struct list_head async_pending;
  57         struct list_head async_completed;
  58         struct list_head memory_list;
  59         wait_queue_head_t wait;     /* wake up if a request completed */
  60         unsigned int discsignr;
  61         struct pid *disc_pid;
  62         const struct cred *cred;
  63         void __user *disccontext;
  64         unsigned long ifclaimed;
  65         u32 disabled_bulk_eps;
  66         bool privileges_dropped;
  67         unsigned long interface_allowed_mask;
  68 };
  69
  70 struct usb_memory {
  71         struct list_head memlist;
  72         int vma_use_count;
  73         int urb_use_count;
  74         u32 size;
  75         void *mem;
  76         dma_addr_t dma_handle;
  77         unsigned long vm_start;
  78         struct usb_dev_state *ps;
  79 };
  80
  81 struct async {
  82         struct list_head asynclist;
  83         struct usb_dev_state *ps;
  84         struct pid *pid;
  85         const struct cred *cred;
  86         unsigned int signr;
  87         unsigned int ifnum;
  88         void __user *userbuffer;
  89         void __user *userurb;
  90         struct urb *urb;
  91         struct usb_memory *usbm;
  92         unsigned int mem_usage;
  93         int status;
  94         u8 bulk_addr;
  95         u8 bulk_status;
  96 };
  97
  98 static bool usbfs_snoop;
  99 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
 100 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
 101
 102 static unsigned usbfs_snoop_max = 65536;
 103 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
 104 MODULE_PARM_DESC(usbfs_snoop_max,
 105                 "maximum number of bytes to print while snooping");
 106
 107 #define snoop(dev, format, arg...)                              \
 108         do {                                                    \
 109                 if (usbfs_snoop)                                \
 110                         dev_info(dev, format, ## arg);          \
 111         } while (0)
 112
 113 enum snoop_when {
 114         SUBMIT, COMPLETE
 115 };
 116
 117 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 118
 119 /* Limit on the total amount of memory we can allocate for transfers */
 120 static u32 usbfs_memory_mb = 16;
 121 module_param(usbfs_memory_mb, uint, 0644);
 122 MODULE_PARM_DESC(usbfs_memory_mb,
 123                 "maximum MB allowed for usbfs buffers (0 = no limit)");
 124
 125 /* Hard limit, necessary to avoid arithmetic overflow */
 126 #define USBFS_XFER_MAX         (UINT_MAX / 2 - 1000000)
 127
 128 static atomic64_t usbfs_memory_usage;   /* Total memory currently allocated */
 129
 130 /* Check whether it's okay to allocate more memory for a transfer */
 131 static int usbfs_increase_memory_usage(u64 amount)
 132 {
 133         u64 lim;
 134
 135         lim = READ_ONCE(usbfs_memory_mb);
 136         lim <<= 20;
 137
 138         atomic64_add(amount, &usbfs_memory_usage);
 139
 140         if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) {
 141                 atomic64_sub(amount, &usbfs_memory_usage);
 142                 return -ENOMEM;
 143         }
 144
 145         return 0;
 146 }
 147
 148 /* Memory for a transfer is being deallocated */
 149 static void usbfs_decrease_memory_usage(u64 amount)
 150 {
 151         atomic64_sub(amount, &usbfs_memory_usage);
 152 }
 153
 154 static int connected(struct usb_dev_state *ps)
 155 {
 156         return (!list_empty(&ps->list) &&
 157                         ps->dev->state != USB_STATE_NOTATTACHED);
 158 }
 159
 160 static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
 161 {
 162         struct usb_dev_state *ps = usbm->ps;
 163         unsigned long flags;
 164
 165         spin_lock_irqsave(&ps->lock, flags);
 166         --*count;
 167         if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
 168                 list_del(&usbm->memlist);
 169                 spin_unlock_irqrestore(&ps->lock, flags);
 170
 171                 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
 172                                 usbm->dma_handle);
 173                 usbfs_decrease_memory_usage(
 174                         usbm->size + sizeof(struct usb_memory));
 175                 kfree(usbm);
 176         } else {
 177                 spin_unlock_irqrestore(&ps->lock, flags);
 178         }
 179 }
 180
 181 static void usbdev_vm_open(struct vm_area_struct *vma)
 182 {
 183         struct usb_memory *usbm = vma->vm_private_data;
 184         unsigned long flags;
 185
 186         spin_lock_irqsave(&usbm->ps->lock, flags);
 187         ++usbm->vma_use_count;
 188         spin_unlock_irqrestore(&usbm->ps->lock, flags);
 189 }
 190
 191 static void usbdev_vm_close(struct vm_area_struct *vma)
 192 {
 193         struct usb_memory *usbm = vma->vm_private_data;
 194
 195         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 196 }
 197
 198 static const struct vm_operations_struct usbdev_vm_ops = {
 199         .open = usbdev_vm_open,
 200         .close = usbdev_vm_close
 201 };
 202
 203 static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
 204 {
 205         struct usb_memory *usbm = NULL;
 206         struct usb_dev_state *ps = file->private_data;
 207         size_t size = vma->vm_end - vma->vm_start;
 208         void *mem;
 209         unsigned long flags;
 210         dma_addr_t dma_handle;
 211         int ret;
 212
 213         ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
 214         if (ret)
 215                 goto error;
 216
 217         usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
 218         if (!usbm) {
 219                 ret = -ENOMEM;
 220                 goto error_decrease_mem;
 221         }
 222
 223         mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
 224                         &dma_handle);
 225         if (!mem) {
 226                 ret = -ENOMEM;
 227                 goto error_free_usbm;
 228         }
 229
 230         memset(mem, 0, size);
 231
 232         usbm->mem = mem;
 233         usbm->dma_handle = dma_handle;
 234         usbm->size = size;
 235         usbm->ps = ps;
 236         usbm->vm_start = vma->vm_start;
 237         usbm->vma_use_count = 1;
 238         INIT_LIST_HEAD(&usbm->memlist);
 239
 240         if (remap_pfn_range(vma, vma->vm_start,
 241                         virt_to_phys(usbm->mem) >> PAGE_SHIFT,
 242                         size, vma->vm_page_prot) < 0) {
 243                 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 244                 return -EAGAIN;
 245         }
 246
 247         vma->vm_flags |= VM_IO;
 248         vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
 249         vma->vm_ops = &usbdev_vm_ops;
 250         vma->vm_private_data = usbm;
 251
 252         spin_lock_irqsave(&ps->lock, flags);
 253         list_add_tail(&usbm->memlist, &ps->memory_list);
 254         spin_unlock_irqrestore(&ps->lock, flags);
 255
 256         return 0;
 257
 258 error_free_usbm:
 259         kfree(usbm);
 260 error_decrease_mem:
 261         usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
 262 error:
 263         return ret;
 264 }
 265
 266 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 267                            loff_t *ppos)
 268 {
 269         struct usb_dev_state *ps = file->private_data;
 270         struct usb_device *dev = ps->dev;
 271         ssize_t ret = 0;
 272         unsigned len;
 273         loff_t pos;
 274         int i;
 275
 276         pos = *ppos;
 277         usb_lock_device(dev);
 278         if (!connected(ps)) {
 279                 ret = -ENODEV;
 280                 goto err;
 281         } else if (pos < 0) {
 282                 ret = -EINVAL;
 283                 goto err;
 284         }
 285
 286         if (pos < sizeof(struct usb_device_descriptor)) {
 287                 /* 18 bytes - fits on the stack */
 288                 struct usb_device_descriptor temp_desc;
 289
 290                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 291                 le16_to_cpus(&temp_desc.bcdUSB);
 292                 le16_to_cpus(&temp_desc.idVendor);
 293                 le16_to_cpus(&temp_desc.idProduct);
 294                 le16_to_cpus(&temp_desc.bcdDevice);
 295
 296                 len = sizeof(struct usb_device_descriptor) - pos;
 297                 if (len > nbytes)
 298                         len = nbytes;
 299                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 300                         ret = -EFAULT;
 301                         goto err;
 302                 }
 303
 304                 *ppos += len;
 305                 buf += len;
 306                 nbytes -= len;
 307                 ret += len;
 308         }
 309
 310         pos = sizeof(struct usb_device_descriptor);
 311         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 312                 struct usb_config_descriptor *config =
 313                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 314                 unsigned int length = le16_to_cpu(config->wTotalLength);
 315
 316                 if (*ppos < pos + length) {
 317
 318                         /* The descriptor may claim to be longer than it
 319                          * really is.  Here is the actual allocated length. */
 320                         unsigned alloclen =
 321                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 322
 323                         len = length - (*ppos - pos);
 324                         if (len > nbytes)
 325                                 len = nbytes;
 326
 327                         /* Simply don't write (skip over) unallocated parts */
 328                         if (alloclen > (*ppos - pos)) {
 329                                 alloclen -= (*ppos - pos);
 330                                 if (copy_to_user(buf,
 331                                     dev->rawdescriptors[i] + (*ppos - pos),
 332                                     min(len, alloclen))) {
 333                                         ret = -EFAULT;
 334                                         goto err;
 335                                 }
 336                         }
 337
 338                         *ppos += len;
 339                         buf += len;
 340                         nbytes -= len;
 341                         ret += len;
 342                 }
 343
 344                 pos += length;
 345         }
 346
 347 err:
 348         usb_unlock_device(dev);
 349         return ret;
 350 }
 351
 352 /*
 353  * async list handling
 354  */
 355
 356 static struct async *alloc_async(unsigned int numisoframes)
 357 {
 358         struct async *as;
 359
 360         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 361         if (!as)
 362                 return NULL;
 363         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 364         if (!as->urb) {
 365                 kfree(as);
 366                 return NULL;
 367         }
 368         return as;
 369 }
 370
 371 static void free_async(struct async *as)
 372 {
 373         int i;
 374
 375         put_pid(as->pid);
 376         if (as->cred)
 377                 put_cred(as->cred);
 378         for (i = 0; i < as->urb->num_sgs; i++) {
 379                 if (sg_page(&as->urb->sg[i]))
 380                         kfree(sg_virt(&as->urb->sg[i]));
 381         }
 382
 383         kfree(as->urb->sg);
 384         if (as->usbm == NULL)
 385                 kfree(as->urb->transfer_buffer);
 386         else
 387                 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
 388
 389         kfree(as->urb->setup_packet);
 390         usb_free_urb(as->urb);
 391         usbfs_decrease_memory_usage(as->mem_usage);
 392         kfree(as);
 393 }
 394
 395 static void async_newpending(struct async *as)
 396 {
 397         struct usb_dev_state *ps = as->ps;
 398         unsigned long flags;
 399
 400         spin_lock_irqsave(&ps->lock, flags);
 401         list_add_tail(&as->asynclist, &ps->async_pending);
 402         spin_unlock_irqrestore(&ps->lock, flags);
 403 }
 404
 405 static void async_removepending(struct async *as)
 406 {
 407         struct usb_dev_state *ps = as->ps;
 408         unsigned long flags;
 409
 410         spin_lock_irqsave(&ps->lock, flags);
 411         list_del_init(&as->asynclist);
 412         spin_unlock_irqrestore(&ps->lock, flags);
 413 }
 414
 415 static struct async *async_getcompleted(struct usb_dev_state *ps)
 416 {
 417         unsigned long flags;
 418         struct async *as = NULL;
 419
 420         spin_lock_irqsave(&ps->lock, flags);
 421         if (!list_empty(&ps->async_completed)) {
 422                 as = list_entry(ps->async_completed.next, struct async,
 423                                 asynclist);
 424                 list_del_init(&as->asynclist);
 425         }
 426         spin_unlock_irqrestore(&ps->lock, flags);
 427         return as;
 428 }
 429
 430 static struct async *async_getpending(struct usb_dev_state *ps,
 431                                              void __user *userurb)
 432 {
 433         struct async *as;
 434
 435         list_for_each_entry(as, &ps->async_pending, asynclist)
 436                 if (as->userurb == userurb) {
 437                         list_del_init(&as->asynclist);
 438                         return as;
 439                 }
 440
 441         return NULL;
 442 }
 443
 444 static void snoop_urb(struct usb_device *udev,
 445                 void __user *userurb, int pipe, unsigned length,
 446                 int timeout_or_status, enum snoop_when when,
 447                 unsigned char *data, unsigned data_len)
 448 {
 449         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 450         static const char *dirs[] = {"out", "in"};
 451         int ep;
 452         const char *t, *d;
 453
 454         if (!usbfs_snoop)
 455                 return;
 456
 457         ep = usb_pipeendpoint(pipe);
 458         t = types[usb_pipetype(pipe)];
 459         d = dirs[!!usb_pipein(pipe)];
 460
 461         if (userurb) {          /* Async */
 462                 if (when == SUBMIT)
 463                         dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
 464                                         "length %u\n",
 465                                         userurb, ep, t, d, length);
 466                 else
 467                         dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
 468                                         "actual_length %u status %d\n",
 469                                         userurb, ep, t, d, length,
 470                                         timeout_or_status);
 471         } else {
 472                 if (when == SUBMIT)
 473                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 474                                         "timeout %d\n",
 475                                         ep, t, d, length, timeout_or_status);
 476                 else
 477                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 478                                         "status %d\n",
 479                                         ep, t, d, length, timeout_or_status);
 480         }
 481
 482         data_len = min(data_len, usbfs_snoop_max);
 483         if (data && data_len > 0) {
 484                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 485                         data, data_len, 1);
 486         }
 487 }
 488
 489 static void snoop_urb_data(struct urb *urb, unsigned len)
 490 {
 491         int i, size;
 492
 493         len = min(len, usbfs_snoop_max);
 494         if (!usbfs_snoop || len == 0)
 495                 return;
 496
 497         if (urb->num_sgs == 0) {
 498                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 499                         urb->transfer_buffer, len, 1);
 500                 return;
 501         }
 502
 503         for (i = 0; i < urb->num_sgs && len; i++) {
 504                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 505                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 506                         sg_virt(&urb->sg[i]), size, 1);
 507                 len -= size;
 508         }
 509 }
 510
 511 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
 512 {
 513         unsigned i, len, size;
 514
 515         if (urb->number_of_packets > 0)         /* Isochronous */
 516                 len = urb->transfer_buffer_length;
 517         else                                    /* Non-Isoc */
 518                 len = urb->actual_length;
 519
 520         if (urb->num_sgs == 0) {
 521                 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
 522                         return -EFAULT;
 523                 return 0;
 524         }
 525
 526         for (i = 0; i < urb->num_sgs && len; i++) {
 527                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 528                 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
 529                         return -EFAULT;
 530                 userbuffer += size;
 531                 len -= size;
 532         }
 533
 534         return 0;
 535 }
 536
 537 #define AS_CONTINUATION 1
 538 #define AS_UNLINK       2
 539
 540 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
 541 __releases(ps->lock)
 542 __acquires(ps->lock)
 543 {
 544         struct urb *urb;
 545         struct async *as;
 546
 547         /* Mark all the pending URBs that match bulk_addr, up to but not
 548          * including the first one without AS_CONTINUATION.  If such an
 549          * URB is encountered then a new transfer has already started so
 550          * the endpoint doesn't need to be disabled; otherwise it does.
 551          */
 552         list_for_each_entry(as, &ps->async_pending, asynclist) {
 553                 if (as->bulk_addr == bulk_addr) {
 554                         if (as->bulk_status != AS_CONTINUATION)
 555                                 goto rescan;
 556                         as->bulk_status = AS_UNLINK;
 557                         as->bulk_addr = 0;
 558                 }
 559         }
 560         ps->disabled_bulk_eps |= (1 << bulk_addr);
 561
 562         /* Now carefully unlink all the marked pending URBs */
 563  rescan:
 564         list_for_each_entry(as, &ps->async_pending, asynclist) {
 565                 if (as->bulk_status == AS_UNLINK) {
 566                         as->bulk_status = 0;            /* Only once */
 567                         urb = as->urb;
 568                         usb_get_urb(urb);
 569                         spin_unlock(&ps->lock);         /* Allow completions */
 570                         usb_unlink_urb(urb);
 571                         usb_put_urb(urb);
 572                         spin_lock(&ps->lock);
 573                         goto rescan;
 574                 }
 575         }
 576 }
 577
 578 static void async_completed(struct urb *urb)
 579 {
 580         struct async *as = urb->context;
 581         struct usb_dev_state *ps = as->ps;
 582         struct kernel_siginfo sinfo;
 583         struct pid *pid = NULL;
 584         const struct cred *cred = NULL;
 585         unsigned long flags;
 586         int signr;
 587
 588         spin_lock_irqsave(&ps->lock, flags);
 589         list_move_tail(&as->asynclist, &ps->async_completed);
 590         as->status = urb->status;
 591         signr = as->signr;
 592         if (signr) {
 593                 clear_siginfo(&sinfo);
 594                 sinfo.si_signo = as->signr;
 595                 sinfo.si_errno = as->status;
 596                 sinfo.si_code = SI_ASYNCIO;
 597                 sinfo.si_addr = as->userurb;
 598                 pid = get_pid(as->pid);
 599                 cred = get_cred(as->cred);
 600         }
 601         snoop(&urb->dev->dev, "urb complete\n");
 602         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 603                         as->status, COMPLETE, NULL, 0);
 604         if (usb_urb_dir_in(urb))
 605                 snoop_urb_data(urb, urb->actual_length);
 606
 607         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 608                         as->status != -ENOENT)
 609                 cancel_bulk_urbs(ps, as->bulk_addr);
 610
 611         wake_up(&ps->wait);
 612         spin_unlock_irqrestore(&ps->lock, flags);
 613
 614         if (signr) {
 615                 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred);
 616                 put_pid(pid);
 617                 put_cred(cred);
 618         }
 619 }
 620
 621 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
 622 {
 623         struct urb *urb;
 624         struct async *as;
 625         unsigned long flags;
 626
 627         spin_lock_irqsave(&ps->lock, flags);
 628         while (!list_empty(list)) {
 629                 as = list_entry(list->next, struct async, asynclist);
 630                 list_del_init(&as->asynclist);
 631                 urb = as->urb;
 632                 usb_get_urb(urb);
 633
 634                 /* drop the spinlock so the completion handler can run */
 635                 spin_unlock_irqrestore(&ps->lock, flags);
 636                 usb_kill_urb(urb);
 637                 usb_put_urb(urb);
 638                 spin_lock_irqsave(&ps->lock, flags);
 639         }
 640         spin_unlock_irqrestore(&ps->lock, flags);
 641 }
 642
 643 static void destroy_async_on_interface(struct usb_dev_state *ps,
 644                                        unsigned int ifnum)
 645 {
 646         struct list_head *p, *q, hitlist;
 647         unsigned long flags;
 648
 649         INIT_LIST_HEAD(&hitlist);
 650         spin_lock_irqsave(&ps->lock, flags);
 651         list_for_each_safe(p, q, &ps->async_pending)
 652                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 653                         list_move_tail(p, &hitlist);
 654         spin_unlock_irqrestore(&ps->lock, flags);
 655         destroy_async(ps, &hitlist);
 656 }
 657
 658 static void destroy_all_async(struct usb_dev_state *ps)
 659 {
 660         destroy_async(ps, &ps->async_pending);
 661 }
 662
 663 /*
 664  * interface claims are made only at the request of user level code,
 665  * which can also release them (explicitly or by closing files).
 666  * they're also undone when devices disconnect.
 667  */
 668
 669 static int driver_probe(struct usb_interface *intf,
 670                         const struct usb_device_id *id)
 671 {
 672         return -ENODEV;
 673 }
 674
 675 static void driver_disconnect(struct usb_interface *intf)
 676 {
 677         struct usb_dev_state *ps = usb_get_intfdata(intf);
 678         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 679
 680         if (!ps)
 681                 return;
 682
 683         /* NOTE:  this relies on usbcore having canceled and completed
 684          * all pending I/O requests; 2.6 does that.
 685          */
 686
 687         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 688                 clear_bit(ifnum, &ps->ifclaimed);
 689         else
 690                 dev_warn(&intf->dev, "interface number %u out of range\n",
 691                          ifnum);
 692
 693         usb_set_intfdata(intf, NULL);
 694
 695         /* force async requests to complete */
 696         destroy_async_on_interface(ps, ifnum);
 697 }
 698
 699 /* The following routines are merely placeholders.  There is no way
 700  * to inform a user task about suspend or resumes.
 701  */
 702 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 703 {
 704         return 0;
 705 }
 706
 707 static int driver_resume(struct usb_interface *intf)
 708 {
 709         return 0;
 710 }
 711
 712 struct usb_driver usbfs_driver = {
 713         .name =         "usbfs",
 714         .probe =        driver_probe,
 715         .disconnect =   driver_disconnect,
 716         .suspend =      driver_suspend,
 717         .resume =       driver_resume,
 718 };
 719
 720 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
 721 {
 722         struct usb_device *dev = ps->dev;
 723         struct usb_interface *intf;
 724         int err;
 725
 726         if (ifnum >= 8*sizeof(ps->ifclaimed))
 727                 return -EINVAL;
 728         /* already claimed */
 729         if (test_bit(ifnum, &ps->ifclaimed))
 730                 return 0;
 731
 732         if (ps->privileges_dropped &&
 733                         !test_bit(ifnum, &ps->interface_allowed_mask))
 734                 return -EACCES;
 735
 736         intf = usb_ifnum_to_if(dev, ifnum);
 737         if (!intf)
 738                 err = -ENOENT;
 739         else
 740                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 741         if (err == 0)
 742                 set_bit(ifnum, &ps->ifclaimed);
 743         return err;
 744 }
 745
 746 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
 747 {
 748         struct usb_device *dev;
 749         struct usb_interface *intf;
 750         int err;
 751
 752         err = -EINVAL;
 753         if (ifnum >= 8*sizeof(ps->ifclaimed))
 754                 return err;
 755         dev = ps->dev;
 756         intf = usb_ifnum_to_if(dev, ifnum);
 757         if (!intf)
 758                 err = -ENOENT;
 759         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 760                 usb_driver_release_interface(&usbfs_driver, intf);
 761                 err = 0;
 762         }
 763         return err;
 764 }
 765
 766 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
 767 {
 768         if (ps->dev->state != USB_STATE_CONFIGURED)
 769                 return -EHOSTUNREACH;
 770         if (ifnum >= 8*sizeof(ps->ifclaimed))
 771                 return -EINVAL;
 772         if (test_bit(ifnum, &ps->ifclaimed))
 773                 return 0;
 774         /* if not yet claimed, claim it for the driver */
 775         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 776                  "interface %u before use\n", task_pid_nr(current),
 777                  current->comm, ifnum);
 778         return claimintf(ps, ifnum);
 779 }
 780
 781 static int findintfep(struct usb_device *dev, unsigned int ep)
 782 {
 783         unsigned int i, j, e;
 784         struct usb_interface *intf;
 785         struct usb_host_interface *alts;
 786         struct usb_endpoint_descriptor *endpt;
 787
 788         if (ep & ~(USB_DIR_IN|0xf))
 789                 return -EINVAL;
 790         if (!dev->actconfig)
 791                 return -ESRCH;
 792         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 793                 intf = dev->actconfig->interface[i];
 794                 for (j = 0; j < intf->num_altsetting; j++) {
 795                         alts = &intf->altsetting[j];
 796                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 797                                 endpt = &alts->endpoint[e].desc;
 798                                 if (endpt->bEndpointAddress == ep)
 799                                         return alts->desc.bInterfaceNumber;
 800                         }
 801                 }
 802         }
 803         return -ENOENT;
 804 }
 805
 806 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
 807                            unsigned int request, unsigned int index)
 808 {
 809         int ret = 0;
 810         struct usb_host_interface *alt_setting;
 811
 812         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 813          && ps->dev->state != USB_STATE_ADDRESS
 814          && ps->dev->state != USB_STATE_CONFIGURED)
 815                 return -EHOSTUNREACH;
 816         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 817                 return 0;
 818
 819         /*
 820          * check for the special corner case 'get_device_id' in the printer
 821          * class specification, which we always want to allow as it is used
 822          * to query things like ink level, etc.
 823          */
 824         if (requesttype == 0xa1 && request == 0) {
 825                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
 826                                                    index >> 8, index & 0xff);
 827                 if (alt_setting
 828                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
 829                         return 0;
 830         }
 831
 832         index &= 0xff;
 833         switch (requesttype & USB_RECIP_MASK) {
 834         case USB_RECIP_ENDPOINT:
 835                 if ((index & ~USB_DIR_IN) == 0)
 836                         return 0;
 837                 ret = findintfep(ps->dev, index);
 838                 if (ret < 0) {
 839                         /*
 840                          * Some not fully compliant Win apps seem to get
 841                          * index wrong and have the endpoint number here
 842                          * rather than the endpoint address (with the
 843                          * correct direction). Win does let this through,
 844                          * so we'll not reject it here but leave it to
 845                          * the device to not break KVM. But we warn.
 846                          */
 847                         ret = findintfep(ps->dev, index ^ 0x80);
 848                         if (ret >= 0)
 849                                 dev_info(&ps->dev->dev,
 850                                         "%s: process %i (%s) requesting ep %02x but needs %02x\n",
 851                                         __func__, task_pid_nr(current),
 852                                         current->comm, index, index ^ 0x80);
 853                 }
 854                 if (ret >= 0)
 855                         ret = checkintf(ps, ret);
 856                 break;
 857
 858         case USB_RECIP_INTERFACE:
 859                 ret = checkintf(ps, index);
 860                 break;
 861         }
 862         return ret;
 863 }
 864
 865 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
 866                                                      unsigned char ep)
 867 {
 868         if (ep & USB_ENDPOINT_DIR_MASK)
 869                 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
 870         else
 871                 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
 872 }
 873
 874 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
 875                                   struct usbdevfs_streams __user *streams,
 876                                   unsigned int *num_streams_ret,
 877                                   unsigned int *num_eps_ret,
 878                                   struct usb_host_endpoint ***eps_ret,
 879                                   struct usb_interface **intf_ret)
 880 {
 881         unsigned int i, num_streams, num_eps;
 882         struct usb_host_endpoint **eps;
 883         struct usb_interface *intf = NULL;
 884         unsigned char ep;
 885         int ifnum, ret;
 886
 887         if (get_user(num_streams, &streams->num_streams) ||
 888             get_user(num_eps, &streams->num_eps))
 889                 return -EFAULT;
 890
 891         if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
 892                 return -EINVAL;
 893
 894         /* The XHCI controller allows max 2 ^ 16 streams */
 895         if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
 896                 return -EINVAL;
 897
 898         eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
 899         if (!eps)
 900                 return -ENOMEM;
 901
 902         for (i = 0; i < num_eps; i++) {
 903                 if (get_user(ep, &streams->eps[i])) {
 904                         ret = -EFAULT;
 905                         goto error;
 906                 }
 907                 eps[i] = ep_to_host_endpoint(ps->dev, ep);
 908                 if (!eps[i]) {
 909                         ret = -EINVAL;
 910                         goto error;
 911                 }
 912
 913                 /* usb_alloc/free_streams operate on an usb_interface */
 914                 ifnum = findintfep(ps->dev, ep);
 915                 if (ifnum < 0) {
 916                         ret = ifnum;
 917                         goto error;
 918                 }
 919
 920                 if (i == 0) {
 921                         ret = checkintf(ps, ifnum);
 922                         if (ret < 0)
 923                                 goto error;
 924                         intf = usb_ifnum_to_if(ps->dev, ifnum);
 925                 } else {
 926                         /* Verify all eps belong to the same interface */
 927                         if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
 928                                 ret = -EINVAL;
 929                                 goto error;
 930                         }
 931                 }
 932         }
 933
 934         if (num_streams_ret)
 935                 *num_streams_ret = num_streams;
 936         *num_eps_ret = num_eps;
 937         *eps_ret = eps;
 938         *intf_ret = intf;
 939
 940         return 0;
 941
 942 error:
 943         kfree(eps);
 944         return ret;
 945 }
 946
 947 static int match_devt(struct device *dev, void *data)
 948 {
 949         return dev->devt == (dev_t) (unsigned long) data;
 950 }
 951
 952 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 953 {
 954         struct device *dev;
 955
 956         dev = bus_find_device(&usb_bus_type, NULL,
 957                               (void *) (unsigned long) devt, match_devt);
 958         if (!dev)
 959                 return NULL;
 960         return to_usb_device(dev);
 961 }
 962
 963 /*
 964  * file operations
 965  */
 966 static int usbdev_open(struct inode *inode, struct file *file)
 967 {
 968         struct usb_device *dev = NULL;
 969         struct usb_dev_state *ps;
 970         int ret;
 971
 972         ret = -ENOMEM;
 973         ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
 974         if (!ps)
 975                 goto out_free_ps;
 976
 977         ret = -ENODEV;
 978
 979         /* usbdev device-node */
 980         if (imajor(inode) == USB_DEVICE_MAJOR)
 981                 dev = usbdev_lookup_by_devt(inode->i_rdev);
 982         if (!dev)
 983                 goto out_free_ps;
 984
 985         usb_lock_device(dev);
 986         if (dev->state == USB_STATE_NOTATTACHED)
 987                 goto out_unlock_device;
 988
 989         ret = usb_autoresume_device(dev);
 990         if (ret)
 991                 goto out_unlock_device;
 992
 993         ps->dev = dev;
 994         ps->file = file;
 995         ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
 996         spin_lock_init(&ps->lock);
 997         INIT_LIST_HEAD(&ps->list);
 998         INIT_LIST_HEAD(&ps->async_pending);
 999         INIT_LIST_HEAD(&ps->async_completed);
1000         INIT_LIST_HEAD(&ps->memory_list);
1001         init_waitqueue_head(&ps->wait);
1002         ps->disc_pid = get_pid(task_pid(current));
1003         ps->cred = get_current_cred();
1004         smp_wmb();
1005         list_add_tail(&ps->list, &dev->filelist);
1006         file->private_data = ps;
1007         usb_unlock_device(dev);
1008         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1009                         current->comm);
1010         return ret;
1011
1012  out_unlock_device:
1013         usb_unlock_device(dev);
1014         usb_put_dev(dev);
1015  out_free_ps:
1016         kfree(ps);
1017         return ret;
1018 }
1019
1020 static int usbdev_release(struct inode *inode, struct file *file)
1021 {
1022         struct usb_dev_state *ps = file->private_data;
1023         struct usb_device *dev = ps->dev;
1024         unsigned int ifnum;
1025         struct async *as;
1026
1027         usb_lock_device(dev);
1028         usb_hub_release_all_ports(dev, ps);
1029
1030         list_del_init(&ps->list);
1031
1032         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1033                         ifnum++) {
1034                 if (test_bit(ifnum, &ps->ifclaimed))
1035                         releaseintf(ps, ifnum);
1036         }
1037         destroy_all_async(ps);
1038         usb_autosuspend_device(dev);
1039         usb_unlock_device(dev);
1040         usb_put_dev(dev);
1041         put_pid(ps->disc_pid);
1042         put_cred(ps->cred);
1043
1044         as = async_getcompleted(ps);
1045         while (as) {
1046                 free_async(as);
1047                 as = async_getcompleted(ps);
1048         }
1049
1050         kfree(ps);
1051         return 0;
1052 }
1053
1054 static int proc_control(struct usb_dev_state *ps, void __user *arg)
1055 {
1056         struct usb_device *dev = ps->dev;
1057         struct usbdevfs_ctrltransfer ctrl;
1058         unsigned int tmo;
1059         unsigned char *tbuf;
1060         unsigned wLength;
1061         int i, pipe, ret;
1062
1063         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1064                 return -EFAULT;
1065         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
1066                               ctrl.wIndex);
1067         if (ret)
1068                 return ret;
1069         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
1070         if (wLength > PAGE_SIZE)
1071                 return -EINVAL;
1072         ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1073                         sizeof(struct usb_ctrlrequest));
1074         if (ret)
1075                 return ret;
1076         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1077         if (!tbuf) {
1078                 ret = -ENOMEM;
1079                 goto done;
1080         }
1081         tmo = ctrl.timeout;
1082         snoop(&dev->dev, "control urb: bRequestType=%02x "
1083                 "bRequest=%02x wValue=%04x "
1084                 "wIndex=%04x wLength=%04x\n",
1085                 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1086                 ctrl.wIndex, ctrl.wLength);
1087         if (ctrl.bRequestType & 0x80) {
1088                 if (ctrl.wLength && !access_ok(ctrl.data,
1089                                                ctrl.wLength)) {
1090                         ret = -EINVAL;
1091                         goto done;
1092                 }
1093                 pipe = usb_rcvctrlpipe(dev, 0);
1094                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1095
1096                 usb_unlock_device(dev);
1097                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1098                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1099                                     tbuf, ctrl.wLength, tmo);
1100                 usb_lock_device(dev);
1101                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1102                           tbuf, max(i, 0));
1103                 if ((i > 0) && ctrl.wLength) {
1104                         if (copy_to_user(ctrl.data, tbuf, i)) {
1105                                 ret = -EFAULT;
1106                                 goto done;
1107                         }
1108                 }
1109         } else {
1110                 if (ctrl.wLength) {
1111                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1112                                 ret = -EFAULT;
1113                                 goto done;
1114                         }
1115                 }
1116                 pipe = usb_sndctrlpipe(dev, 0);
1117                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1118                         tbuf, ctrl.wLength);
1119
1120                 usb_unlock_device(dev);
1121                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1122                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1123                                     tbuf, ctrl.wLength, tmo);
1124                 usb_lock_device(dev);
1125                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1126         }
1127         if (i < 0 && i != -EPIPE) {
1128                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1129                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
1130                            current->comm, ctrl.bRequestType, ctrl.bRequest,
1131                            ctrl.wLength, i);
1132         }
1133         ret = i;
1134  done:
1135         free_page((unsigned long) tbuf);
1136         usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1137                         sizeof(struct usb_ctrlrequest));
1138         return ret;
1139 }
1140
1141 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1142 {
1143         struct usb_device *dev = ps->dev;
1144         struct usbdevfs_bulktransfer bulk;
1145         unsigned int tmo, len1, pipe;
1146         int len2;
1147         unsigned char *tbuf;
1148         int i, ret;
1149
1150         if (copy_from_user(&bulk, arg, sizeof(bulk)))
1151                 return -EFAULT;
1152         ret = findintfep(ps->dev, bulk.ep);
1153         if (ret < 0)
1154                 return ret;
1155         ret = checkintf(ps, ret);
1156         if (ret)
1157                 return ret;
1158         if (bulk.ep & USB_DIR_IN)
1159                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1160         else
1161                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1162         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1163                 return -EINVAL;
1164         len1 = bulk.len;
1165         if (len1 >= (INT_MAX - sizeof(struct urb)))
1166                 return -EINVAL;
1167         ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1168         if (ret)
1169                 return ret;
1170         tbuf = kmalloc(len1, GFP_KERNEL);
1171         if (!tbuf) {
1172                 ret = -ENOMEM;
1173                 goto done;
1174         }
1175         tmo = bulk.timeout;
1176         if (bulk.ep & 0x80) {
1177                 if (len1 && !access_ok(bulk.data, len1)) {
1178                         ret = -EINVAL;
1179                         goto done;
1180                 }
1181                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1182
1183                 usb_unlock_device(dev);
1184                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1185                 usb_lock_device(dev);
1186                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1187
1188                 if (!i && len2) {
1189                         if (copy_to_user(bulk.data, tbuf, len2)) {
1190                                 ret = -EFAULT;
1191                                 goto done;
1192                         }
1193                 }
1194         } else {
1195                 if (len1) {
1196                         if (copy_from_user(tbuf, bulk.data, len1)) {
1197                                 ret = -EFAULT;
1198                                 goto done;
1199                         }
1200                 }
1201                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1202
1203                 usb_unlock_device(dev);
1204                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1205                 usb_lock_device(dev);
1206                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1207         }
1208         ret = (i < 0 ? i : len2);
1209  done:
1210         kfree(tbuf);
1211         usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1212         return ret;
1213 }
1214
1215 static void check_reset_of_active_ep(struct usb_device *udev,
1216                 unsigned int epnum, char *ioctl_name)
1217 {
1218         struct usb_host_endpoint **eps;
1219         struct usb_host_endpoint *ep;
1220
1221         eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1222         ep = eps[epnum & 0x0f];
1223         if (ep && !list_empty(&ep->urb_list))
1224                 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1225                                 task_pid_nr(current), current->comm,
1226                                 ioctl_name, epnum);
1227 }
1228
1229 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1230 {
1231         unsigned int ep;
1232         int ret;
1233
1234         if (get_user(ep, (unsigned int __user *)arg))
1235                 return -EFAULT;
1236         ret = findintfep(ps->dev, ep);
1237         if (ret < 0)
1238                 return ret;
1239         ret = checkintf(ps, ret);
1240         if (ret)
1241                 return ret;
1242         check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1243         usb_reset_endpoint(ps->dev, ep);
1244         return 0;
1245 }
1246
1247 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1248 {
1249         unsigned int ep;
1250         int pipe;
1251         int ret;
1252
1253         if (get_user(ep, (unsigned int __user *)arg))
1254                 return -EFAULT;
1255         ret = findintfep(ps->dev, ep);
1256         if (ret < 0)
1257                 return ret;
1258         ret = checkintf(ps, ret);
1259         if (ret)
1260                 return ret;
1261         check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1262         if (ep & USB_DIR_IN)
1263                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1264         else
1265                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1266
1267         return usb_clear_halt(ps->dev, pipe);
1268 }
1269
1270 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1271 {
1272         struct usbdevfs_getdriver gd;
1273         struct usb_interface *intf;
1274         int ret;
1275
1276         if (copy_from_user(&gd, arg, sizeof(gd)))
1277                 return -EFAULT;
1278         intf = usb_ifnum_to_if(ps->dev, gd.interface);
1279         if (!intf || !intf->dev.driver)
1280                 ret = -ENODATA;
1281         else {
1282                 strlcpy(gd.driver, intf->dev.driver->name,
1283                                 sizeof(gd.driver));
1284                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1285         }
1286         return ret;
1287 }
1288
1289 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1290 {
1291         struct usbdevfs_connectinfo ci;
1292
1293         memset(&ci, 0, sizeof(ci));
1294         ci.devnum = ps->dev->devnum;
1295         ci.slow = ps->dev->speed == USB_SPEED_LOW;
1296
1297         if (copy_to_user(arg, &ci, sizeof(ci)))
1298                 return -EFAULT;
1299         return 0;
1300 }
1301
1302 static int proc_conninfo_ex(struct usb_dev_state *ps,
1303                             void __user *arg, size_t size)
1304 {
1305         struct usbdevfs_conninfo_ex ci;
1306         struct usb_device *udev = ps->dev;
1307
1308         if (size < sizeof(ci.size))
1309                 return -EINVAL;
1310
1311         memset(&ci, 0, sizeof(ci));
1312         ci.size = sizeof(ci);
1313         ci.busnum = udev->bus->busnum;
1314         ci.devnum = udev->devnum;
1315         ci.speed = udev->speed;
1316
1317         while (udev && udev->portnum != 0) {
1318                 if (++ci.num_ports <= ARRAY_SIZE(ci.ports))
1319                         ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports] =
1320                                         udev->portnum;
1321                 udev = udev->parent;
1322         }
1323
1324         if (ci.num_ports < ARRAY_SIZE(ci.ports))
1325                 memmove(&ci.ports[0],
1326                         &ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports],
1327                         ci.num_ports);
1328
1329         if (copy_to_user(arg, &ci, min(sizeof(ci), size)))
1330                 return -EFAULT;
1331
1332         return 0;
1333 }
1334
1335 static int proc_resetdevice(struct usb_dev_state *ps)
1336 {
1337         struct usb_host_config *actconfig = ps->dev->actconfig;
1338         struct usb_interface *interface;
1339         int i, number;
1340
1341         /* Don't allow a device reset if the process has dropped the
1342          * privilege to do such things and any of the interfaces are
1343          * currently claimed.
1344          */
1345         if (ps->privileges_dropped && actconfig) {
1346                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1347                         interface = actconfig->interface[i];
1348                         number = interface->cur_altsetting->desc.bInterfaceNumber;
1349                         if (usb_interface_claimed(interface) &&
1350                                         !test_bit(number, &ps->ifclaimed)) {
1351                                 dev_warn(&ps->dev->dev,
1352                                         "usbfs: interface %d claimed by %s while '%s' resets device\n",
1353                                         number, interface->dev.driver->name, current->comm);
1354                                 return -EACCES;
1355                         }
1356                 }
1357         }
1358
1359         return usb_reset_device(ps->dev);
1360 }
1361
1362 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1363 {
1364         struct usbdevfs_setinterface setintf;
1365         int ret;
1366
1367         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1368                 return -EFAULT;
1369         ret = checkintf(ps, setintf.interface);
1370         if (ret)
1371                 return ret;
1372
1373         destroy_async_on_interface(ps, setintf.interface);
1374
1375         return usb_set_interface(ps->dev, setintf.interface,
1376                         setintf.altsetting);
1377 }
1378
1379 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1380 {
1381         int u;
1382         int status = 0;
1383         struct usb_host_config *actconfig;
1384
1385         if (get_user(u, (int __user *)arg))
1386                 return -EFAULT;
1387
1388         actconfig = ps->dev->actconfig;
1389
1390         /* Don't touch the device if any interfaces are claimed.
1391          * It could interfere with other drivers' operations, and if
1392          * an interface is claimed by usbfs it could easily deadlock.
1393          */
1394         if (actconfig) {
1395                 int i;
1396
1397                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1398                         if (usb_interface_claimed(actconfig->interface[i])) {
1399                                 dev_warn(&ps->dev->dev,
1400                                         "usbfs: interface %d claimed by %s "
1401                                         "while '%s' sets config #%d\n",
1402                                         actconfig->interface[i]
1403                                                 ->cur_altsetting
1404                                                 ->desc.bInterfaceNumber,
1405                                         actconfig->interface[i]
1406                                                 ->dev.driver->name,
1407                                         current->comm, u);
1408                                 status = -EBUSY;
1409                                 break;
1410                         }
1411                 }
1412         }
1413
1414         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1415          * so avoid usb_set_configuration()'s kick to sysfs
1416          */
1417         if (status == 0) {
1418                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1419                         status = usb_reset_configuration(ps->dev);
1420                 else
1421                         status = usb_set_configuration(ps->dev, u);
1422         }
1423
1424         return status;
1425 }
1426
1427 static struct usb_memory *
1428 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1429 {
1430         struct usb_memory *usbm = NULL, *iter;
1431         unsigned long flags;
1432         unsigned long uurb_start = (unsigned long)uurb->buffer;
1433
1434         spin_lock_irqsave(&ps->lock, flags);
1435         list_for_each_entry(iter, &ps->memory_list, memlist) {
1436                 if (uurb_start >= iter->vm_start &&
1437                                 uurb_start < iter->vm_start + iter->size) {
1438                         if (uurb->buffer_length > iter->vm_start + iter->size -
1439                                         uurb_start) {
1440                                 usbm = ERR_PTR(-EINVAL);
1441                         } else {
1442                                 usbm = iter;
1443                                 usbm->urb_use_count++;
1444                         }
1445                         break;
1446                 }
1447         }
1448         spin_unlock_irqrestore(&ps->lock, flags);
1449         return usbm;
1450 }
1451
1452 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1453                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1454                         void __user *arg)
1455 {
1456         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1457         struct usb_host_endpoint *ep;
1458         struct async *as = NULL;
1459         struct usb_ctrlrequest *dr = NULL;
1460         unsigned int u, totlen, isofrmlen;
1461         int i, ret, num_sgs = 0, ifnum = -1;
1462         int number_of_packets = 0;
1463         unsigned int stream_id = 0;
1464         void *buf;
1465         bool is_in;
1466         bool allow_short = false;
1467         bool allow_zero = false;
1468         unsigned long mask =    USBDEVFS_URB_SHORT_NOT_OK |
1469                                 USBDEVFS_URB_BULK_CONTINUATION |
1470                                 USBDEVFS_URB_NO_FSBR |
1471                                 USBDEVFS_URB_ZERO_PACKET |
1472                                 USBDEVFS_URB_NO_INTERRUPT;
1473         /* USBDEVFS_URB_ISO_ASAP is a special case */
1474         if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1475                 mask |= USBDEVFS_URB_ISO_ASAP;
1476
1477         if (uurb->flags & ~mask)
1478                         return -EINVAL;
1479
1480         if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1481                 return -EINVAL;
1482         if (uurb->buffer_length > 0 && !uurb->buffer)
1483                 return -EINVAL;
1484         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1485             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1486                 ifnum = findintfep(ps->dev, uurb->endpoint);
1487                 if (ifnum < 0)
1488                         return ifnum;
1489                 ret = checkintf(ps, ifnum);
1490                 if (ret)
1491                         return ret;
1492         }
1493         ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1494         if (!ep)
1495                 return -ENOENT;
1496         is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1497
1498         u = 0;
1499         switch (uurb->type) {
1500         case USBDEVFS_URB_TYPE_CONTROL:
1501                 if (!usb_endpoint_xfer_control(&ep->desc))
1502                         return -EINVAL;
1503                 /* min 8 byte setup packet */
1504                 if (uurb->buffer_length < 8)
1505                         return -EINVAL;
1506                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1507                 if (!dr)
1508                         return -ENOMEM;
1509                 if (copy_from_user(dr, uurb->buffer, 8)) {
1510                         ret = -EFAULT;
1511                         goto error;
1512                 }
1513                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1514                         ret = -EINVAL;
1515                         goto error;
1516                 }
1517                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1518                                       le16_to_cpup(&dr->wIndex));
1519                 if (ret)
1520                         goto error;
1521                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1522                 uurb->buffer += 8;
1523                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1524                         is_in = 1;
1525                         uurb->endpoint |= USB_DIR_IN;
1526                 } else {
1527                         is_in = 0;
1528                         uurb->endpoint &= ~USB_DIR_IN;
1529                 }
1530                 if (is_in)
1531                         allow_short = true;
1532                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1533                         "bRequest=%02x wValue=%04x "
1534                         "wIndex=%04x wLength=%04x\n",
1535                         dr->bRequestType, dr->bRequest,
1536                         __le16_to_cpup(&dr->wValue),
1537                         __le16_to_cpup(&dr->wIndex),
1538                         __le16_to_cpup(&dr->wLength));
1539                 u = sizeof(struct usb_ctrlrequest);
1540                 break;
1541
1542         case USBDEVFS_URB_TYPE_BULK:
1543                 if (!is_in)
1544                         allow_zero = true;
1545                 else
1546                         allow_short = true;
1547                 switch (usb_endpoint_type(&ep->desc)) {
1548                 case USB_ENDPOINT_XFER_CONTROL:
1549                 case USB_ENDPOINT_XFER_ISOC:
1550                         return -EINVAL;
1551                 case USB_ENDPOINT_XFER_INT:
1552                         /* allow single-shot interrupt transfers */
1553                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1554                         goto interrupt_urb;
1555                 }
1556                 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1557                 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1558                         num_sgs = 0;
1559                 if (ep->streams)
1560                         stream_id = uurb->stream_id;
1561                 break;
1562
1563         case USBDEVFS_URB_TYPE_INTERRUPT:
1564                 if (!usb_endpoint_xfer_int(&ep->desc))
1565                         return -EINVAL;
1566  interrupt_urb:
1567                 if (!is_in)
1568                         allow_zero = true;
1569                 else
1570                         allow_short = true;
1571                 break;
1572
1573         case USBDEVFS_URB_TYPE_ISO:
1574                 /* arbitrary limit */
1575                 if (uurb->number_of_packets < 1 ||
1576                     uurb->number_of_packets > 128)
1577                         return -EINVAL;
1578                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1579                         return -EINVAL;
1580                 number_of_packets = uurb->number_of_packets;
1581                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1582                                    number_of_packets;
1583                 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1584                 if (IS_ERR(isopkt)) {
1585                         ret = PTR_ERR(isopkt);
1586                         isopkt = NULL;
1587                         goto error;
1588                 }
1589                 for (totlen = u = 0; u < number_of_packets; u++) {
1590                         /*
1591                          * arbitrary limit need for USB 3.1 Gen2
1592                          * sizemax: 96 DPs at SSP, 96 * 1024 = 98304
1593                          */
1594                         if (isopkt[u].length > 98304) {
1595                                 ret = -EINVAL;
1596                                 goto error;
1597                         }
1598                         totlen += isopkt[u].length;
1599                 }
1600                 u *= sizeof(struct usb_iso_packet_descriptor);
1601                 uurb->buffer_length = totlen;
1602                 break;
1603
1604         default:
1605                 return -EINVAL;
1606         }
1607
1608         if (uurb->buffer_length > 0 &&
1609                         !access_ok(uurb->buffer, uurb->buffer_length)) {
1610                 ret = -EFAULT;
1611                 goto error;
1612         }
1613         as = alloc_async(number_of_packets);
1614         if (!as) {
1615                 ret = -ENOMEM;
1616                 goto error;
1617         }
1618
1619         as->usbm = find_memory_area(ps, uurb);
1620         if (IS_ERR(as->usbm)) {
1621                 ret = PTR_ERR(as->usbm);
1622                 as->usbm = NULL;
1623                 goto error;
1624         }
1625
1626         /* do not use SG buffers when memory mapped segments
1627          * are in use
1628          */
1629         if (as->usbm)
1630                 num_sgs = 0;
1631
1632         u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1633              num_sgs * sizeof(struct scatterlist);
1634         ret = usbfs_increase_memory_usage(u);
1635         if (ret)
1636                 goto error;
1637         as->mem_usage = u;
1638
1639         if (num_sgs) {
1640                 as->urb->sg = kmalloc_array(num_sgs,
1641                                             sizeof(struct scatterlist),
1642                                             GFP_KERNEL);
1643                 if (!as->urb->sg) {
1644                         ret = -ENOMEM;
1645                         goto error;
1646                 }
1647                 as->urb->num_sgs = num_sgs;
1648                 sg_init_table(as->urb->sg, as->urb->num_sgs);
1649
1650                 totlen = uurb->buffer_length;
1651                 for (i = 0; i < as->urb->num_sgs; i++) {
1652                         u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1653                         buf = kmalloc(u, GFP_KERNEL);
1654                         if (!buf) {
1655                                 ret = -ENOMEM;
1656                                 goto error;
1657                         }
1658                         sg_set_buf(&as->urb->sg[i], buf, u);
1659
1660                         if (!is_in) {
1661                                 if (copy_from_user(buf, uurb->buffer, u)) {
1662                                         ret = -EFAULT;
1663                                         goto error;
1664                                 }
1665                                 uurb->buffer += u;
1666                         }
1667                         totlen -= u;
1668                 }
1669         } else if (uurb->buffer_length > 0) {
1670                 if (as->usbm) {
1671                         unsigned long uurb_start = (unsigned long)uurb->buffer;
1672
1673                         as->urb->transfer_buffer = as->usbm->mem +
1674                                         (uurb_start - as->usbm->vm_start);
1675                 } else {
1676                         as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1677                                         GFP_KERNEL);
1678                         if (!as->urb->transfer_buffer) {
1679                                 ret = -ENOMEM;
1680                                 goto error;
1681                         }
1682                         if (!is_in) {
1683                                 if (copy_from_user(as->urb->transfer_buffer,
1684                                                    uurb->buffer,
1685                                                    uurb->buffer_length)) {
1686                                         ret = -EFAULT;
1687                                         goto error;
1688                                 }
1689                         } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1690                                 /*
1691                                  * Isochronous input data may end up being
1692                                  * discontiguous if some of the packets are
1693                                  * short. Clear the buffer so that the gaps
1694                                  * don't leak kernel data to userspace.
1695                                  */
1696                                 memset(as->urb->transfer_buffer, 0,
1697                                                 uurb->buffer_length);
1698                         }
1699                 }
1700         }
1701         as->urb->dev = ps->dev;
1702         as->urb->pipe = (uurb->type << 30) |
1703                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1704                         (uurb->endpoint & USB_DIR_IN);
1705
1706         /* This tedious sequence is necessary because the URB_* flags
1707          * are internal to the kernel and subject to change, whereas
1708          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1709          */
1710         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1711         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1712                 u |= URB_ISO_ASAP;
1713         if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1714                 u |= URB_SHORT_NOT_OK;
1715         if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1716                 u |= URB_ZERO_PACKET;
1717         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1718                 u |= URB_NO_INTERRUPT;
1719         as->urb->transfer_flags = u;
1720
1721         if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1722                 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1723         if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1724                 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1725
1726         as->urb->transfer_buffer_length = uurb->buffer_length;
1727         as->urb->setup_packet = (unsigned char *)dr;
1728         dr = NULL;
1729         as->urb->start_frame = uurb->start_frame;
1730         as->urb->number_of_packets = number_of_packets;
1731         as->urb->stream_id = stream_id;
1732
1733         if (ep->desc.bInterval) {
1734                 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1735                                 ps->dev->speed == USB_SPEED_HIGH ||
1736                                 ps->dev->speed >= USB_SPEED_SUPER)
1737                         as->urb->interval = 1 <<
1738                                         min(15, ep->desc.bInterval - 1);
1739                 else
1740                         as->urb->interval = ep->desc.bInterval;
1741         }
1742
1743         as->urb->context = as;
1744         as->urb->complete = async_completed;
1745         for (totlen = u = 0; u < number_of_packets; u++) {
1746                 as->urb->iso_frame_desc[u].offset = totlen;
1747                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1748                 totlen += isopkt[u].length;
1749         }
1750         kfree(isopkt);
1751         isopkt = NULL;
1752         as->ps = ps;
1753         as->userurb = arg;
1754         if (as->usbm) {
1755                 unsigned long uurb_start = (unsigned long)uurb->buffer;
1756
1757                 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1758                 as->urb->transfer_dma = as->usbm->dma_handle +
1759                                 (uurb_start - as->usbm->vm_start);
1760         } else if (is_in && uurb->buffer_length > 0)
1761                 as->userbuffer = uurb->buffer;
1762         as->signr = uurb->signr;
1763         as->ifnum = ifnum;
1764         as->pid = get_pid(task_pid(current));
1765         as->cred = get_current_cred();
1766         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1767                         as->urb->transfer_buffer_length, 0, SUBMIT,
1768                         NULL, 0);
1769         if (!is_in)
1770                 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1771
1772         async_newpending(as);
1773
1774         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1775                 spin_lock_irq(&ps->lock);
1776
1777                 /* Not exactly the endpoint address; the direction bit is
1778                  * shifted to the 0x10 position so that the value will be
1779                  * between 0 and 31.
1780                  */
1781                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1782                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1783                                 >> 3);
1784
1785                 /* If this bulk URB is the start of a new transfer, re-enable
1786                  * the endpoint.  Otherwise mark it as a continuation URB.
1787                  */
1788                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1789                         as->bulk_status = AS_CONTINUATION;
1790                 else
1791                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1792
1793                 /* Don't accept continuation URBs if the endpoint is
1794                  * disabled because of an earlier error.
1795                  */
1796                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1797                         ret = -EREMOTEIO;
1798                 else
1799                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1800                 spin_unlock_irq(&ps->lock);
1801         } else {
1802                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1803         }
1804
1805         if (ret) {
1806                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1807                            "usbfs: usb_submit_urb returned %d\n", ret);
1808                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1809                                 0, ret, COMPLETE, NULL, 0);
1810                 async_removepending(as);
1811                 goto error;
1812         }
1813         return 0;
1814
1815  error:
1816         if (as && as->usbm)
1817                 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
1818         kfree(isopkt);
1819         kfree(dr);
1820         if (as)
1821                 free_async(as);
1822         return ret;
1823 }
1824
1825 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1826 {
1827         struct usbdevfs_urb uurb;
1828
1829         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1830                 return -EFAULT;
1831
1832         return proc_do_submiturb(ps, &uurb,
1833                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1834                         arg);
1835 }
1836
1837 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1838 {
1839         struct urb *urb;
1840         struct async *as;
1841         unsigned long flags;
1842
1843         spin_lock_irqsave(&ps->lock, flags);
1844         as = async_getpending(ps, arg);
1845         if (!as) {
1846                 spin_unlock_irqrestore(&ps->lock, flags);
1847                 return -EINVAL;
1848         }
1849
1850         urb = as->urb;
1851         usb_get_urb(urb);
1852         spin_unlock_irqrestore(&ps->lock, flags);
1853
1854         usb_kill_urb(urb);
1855         usb_put_urb(urb);
1856
1857         return 0;
1858 }
1859
1860 static void compute_isochronous_actual_length(struct urb *urb)
1861 {
1862         unsigned int i;
1863
1864         if (urb->number_of_packets > 0) {
1865                 urb->actual_length = 0;
1866                 for (i = 0; i < urb->number_of_packets; i++)
1867                         urb->actual_length +=
1868                                         urb->iso_frame_desc[i].actual_length;
1869         }
1870 }
1871
1872 static int processcompl(struct async *as, void __user * __user *arg)
1873 {
1874         struct urb *urb = as->urb;
1875         struct usbdevfs_urb __user *userurb = as->userurb;
1876         void __user *addr = as->userurb;
1877         unsigned int i;
1878
1879         compute_isochronous_actual_length(urb);
1880         if (as->userbuffer && urb->actual_length) {
1881                 if (copy_urb_data_to_user(as->userbuffer, urb))
1882                         goto err_out;
1883         }
1884         if (put_user(as->status, &userurb->status))
1885                 goto err_out;
1886         if (put_user(urb->actual_length, &userurb->actual_length))
1887                 goto err_out;
1888         if (put_user(urb->error_count, &userurb->error_count))
1889                 goto err_out;
1890
1891         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1892                 for (i = 0; i < urb->number_of_packets; i++) {
1893                         if (put_user(urb->iso_frame_desc[i].actual_length,
1894                                      &userurb->iso_frame_desc[i].actual_length))
1895                                 goto err_out;
1896                         if (put_user(urb->iso_frame_desc[i].status,
1897                                      &userurb->iso_frame_desc[i].status))
1898                                 goto err_out;
1899                 }
1900         }
1901
1902         if (put_user(addr, (void __user * __user *)arg))
1903                 return -EFAULT;
1904         return 0;
1905
1906 err_out:
1907         return -EFAULT;
1908 }
1909
1910 static struct async *reap_as(struct usb_dev_state *ps)
1911 {
1912         DECLARE_WAITQUEUE(wait, current);
1913         struct async *as = NULL;
1914         struct usb_device *dev = ps->dev;
1915
1916         add_wait_queue(&ps->wait, &wait);
1917         for (;;) {
1918                 __set_current_state(TASK_INTERRUPTIBLE);
1919                 as = async_getcompleted(ps);
1920                 if (as || !connected(ps))
1921                         break;
1922                 if (signal_pending(current))
1923                         break;
1924                 usb_unlock_device(dev);
1925                 schedule();
1926                 usb_lock_device(dev);
1927         }
1928         remove_wait_queue(&ps->wait, &wait);
1929         set_current_state(TASK_RUNNING);
1930         return as;
1931 }
1932
1933 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1934 {
1935         struct async *as = reap_as(ps);
1936
1937         if (as) {
1938                 int retval;
1939
1940                 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
1941                 retval = processcompl(as, (void __user * __user *)arg);
1942                 free_async(as);
1943                 return retval;
1944         }
1945         if (signal_pending(current))
1946                 return -EINTR;
1947         return -ENODEV;
1948 }
1949
1950 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1951 {
1952         int retval;
1953         struct async *as;
1954
1955         as = async_getcompleted(ps);
1956         if (as) {
1957                 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
1958                 retval = processcompl(as, (void __user * __user *)arg);
1959                 free_async(as);
1960         } else {
1961                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1962         }
1963         return retval;
1964 }
1965
1966 #ifdef CONFIG_COMPAT
1967 static int proc_control_compat(struct usb_dev_state *ps,
1968                                 struct usbdevfs_ctrltransfer32 __user *p32)
1969 {
1970         struct usbdevfs_ctrltransfer __user *p;
1971         __u32 udata;
1972         p = compat_alloc_user_space(sizeof(*p));
1973         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1974             get_user(udata, &p32->data) ||
1975             put_user(compat_ptr(udata), &p->data))
1976                 return -EFAULT;
1977         return proc_control(ps, p);
1978 }
1979
1980 static int proc_bulk_compat(struct usb_dev_state *ps,
1981                         struct usbdevfs_bulktransfer32 __user *p32)
1982 {
1983         struct usbdevfs_bulktransfer __user *p;
1984         compat_uint_t n;
1985         compat_caddr_t addr;
1986
1987         p = compat_alloc_user_space(sizeof(*p));
1988
1989         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1990             get_user(n, &p32->len) || put_user(n, &p->len) ||
1991             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1992             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1993                 return -EFAULT;
1994
1995         return proc_bulk(ps, p);
1996 }
1997 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1998 {
1999         struct usbdevfs_disconnectsignal32 ds;
2000
2001         if (copy_from_user(&ds, arg, sizeof(ds)))
2002                 return -EFAULT;
2003         ps->discsignr = ds.signr;
2004         ps->disccontext = compat_ptr(ds.context);
2005         return 0;
2006 }
2007
2008 static int get_urb32(struct usbdevfs_urb *kurb,
2009                      struct usbdevfs_urb32 __user *uurb)
2010 {
2011         struct usbdevfs_urb32 urb32;
2012         if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
2013                 return -EFAULT;
2014         kurb->type = urb32.type;
2015         kurb->endpoint = urb32.endpoint;
2016         kurb->status = urb32.status;
2017         kurb->flags = urb32.flags;
2018         kurb->buffer = compat_ptr(urb32.buffer);
2019         kurb->buffer_length = urb32.buffer_length;
2020         kurb->actual_length = urb32.actual_length;
2021         kurb->start_frame = urb32.start_frame;
2022         kurb->number_of_packets = urb32.number_of_packets;
2023         kurb->error_count = urb32.error_count;
2024         kurb->signr = urb32.signr;
2025         kurb->usercontext = compat_ptr(urb32.usercontext);
2026         return 0;
2027 }
2028
2029 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2030 {
2031         struct usbdevfs_urb uurb;
2032
2033         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2034                 return -EFAULT;
2035
2036         return proc_do_submiturb(ps, &uurb,
2037                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2038                         arg);
2039 }
2040
2041 static int processcompl_compat(struct async *as, void __user * __user *arg)
2042 {
2043         struct urb *urb = as->urb;
2044         struct usbdevfs_urb32 __user *userurb = as->userurb;
2045         void __user *addr = as->userurb;
2046         unsigned int i;
2047
2048         compute_isochronous_actual_length(urb);
2049         if (as->userbuffer && urb->actual_length) {
2050                 if (copy_urb_data_to_user(as->userbuffer, urb))
2051                         return -EFAULT;
2052         }
2053         if (put_user(as->status, &userurb->status))
2054                 return -EFAULT;
2055         if (put_user(urb->actual_length, &userurb->actual_length))
2056                 return -EFAULT;
2057         if (put_user(urb->error_count, &userurb->error_count))
2058                 return -EFAULT;
2059
2060         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2061                 for (i = 0; i < urb->number_of_packets; i++) {
2062                         if (put_user(urb->iso_frame_desc[i].actual_length,
2063                                      &userurb->iso_frame_desc[i].actual_length))
2064                                 return -EFAULT;
2065                         if (put_user(urb->iso_frame_desc[i].status,
2066                                      &userurb->iso_frame_desc[i].status))
2067                                 return -EFAULT;
2068                 }
2069         }
2070
2071         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2072                 return -EFAULT;
2073         return 0;
2074 }
2075
2076 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2077 {
2078         struct async *as = reap_as(ps);
2079
2080         if (as) {
2081                 int retval;
2082
2083                 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2084                 retval = processcompl_compat(as, (void __user * __user *)arg);
2085                 free_async(as);
2086                 return retval;
2087         }
2088         if (signal_pending(current))
2089                 return -EINTR;
2090         return -ENODEV;
2091 }
2092
2093 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2094 {
2095         int retval;
2096         struct async *as;
2097
2098         as = async_getcompleted(ps);
2099         if (as) {
2100                 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2101                 retval = processcompl_compat(as, (void __user * __user *)arg);
2102                 free_async(as);
2103         } else {
2104                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2105         }
2106         return retval;
2107 }
2108
2109
2110 #endif
2111
2112 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2113 {
2114         struct usbdevfs_disconnectsignal ds;
2115
2116         if (copy_from_user(&ds, arg, sizeof(ds)))
2117                 return -EFAULT;
2118         ps->discsignr = ds.signr;
2119         ps->disccontext = ds.context;
2120         return 0;
2121 }
2122
2123 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2124 {
2125         unsigned int ifnum;
2126
2127         if (get_user(ifnum, (unsigned int __user *)arg))
2128                 return -EFAULT;
2129         return claimintf(ps, ifnum);
2130 }
2131
2132 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2133 {
2134         unsigned int ifnum;
2135         int ret;
2136
2137         if (get_user(ifnum, (unsigned int __user *)arg))
2138                 return -EFAULT;
2139         ret = releaseintf(ps, ifnum);
2140         if (ret < 0)
2141                 return ret;
2142         destroy_async_on_interface(ps, ifnum);
2143         return 0;
2144 }
2145
2146 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2147 {
2148         int                     size;
2149         void                    *buf = NULL;
2150         int                     retval = 0;
2151         struct usb_interface    *intf = NULL;
2152         struct usb_driver       *driver = NULL;
2153
2154         if (ps->privileges_dropped)
2155                 return -EACCES;
2156
2157         if (!connected(ps))
2158                 return -ENODEV;
2159
2160         /* alloc buffer */
2161         size = _IOC_SIZE(ctl->ioctl_code);
2162         if (size > 0) {
2163                 buf = kmalloc(size, GFP_KERNEL);
2164                 if (buf == NULL)
2165                         return -ENOMEM;
2166                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2167                         if (copy_from_user(buf, ctl->data, size)) {
2168                                 kfree(buf);
2169                                 return -EFAULT;
2170                         }
2171                 } else {
2172                         memset(buf, 0, size);
2173                 }
2174         }
2175
2176         if (ps->dev->state != USB_STATE_CONFIGURED)
2177                 retval = -EHOSTUNREACH;
2178         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2179                 retval = -EINVAL;
2180         else switch (ctl->ioctl_code) {
2181
2182         /* disconnect kernel driver from interface */
2183         case USBDEVFS_DISCONNECT:
2184                 if (intf->dev.driver) {
2185                         driver = to_usb_driver(intf->dev.driver);
2186                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
2187                         usb_driver_release_interface(driver, intf);
2188                 } else
2189                         retval = -ENODATA;
2190                 break;
2191
2192         /* let kernel drivers try to (re)bind to the interface */
2193         case USBDEVFS_CONNECT:
2194                 if (!intf->dev.driver)
2195                         retval = device_attach(&intf->dev);
2196                 else
2197                         retval = -EBUSY;
2198                 break;
2199
2200         /* talk directly to the interface's driver */
2201         default:
2202                 if (intf->dev.driver)
2203                         driver = to_usb_driver(intf->dev.driver);
2204                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2205                         retval = -ENOTTY;
2206                 } else {
2207                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2208                         if (retval == -ENOIOCTLCMD)
2209                                 retval = -ENOTTY;
2210                 }
2211         }
2212
2213         /* cleanup and return */
2214         if (retval >= 0
2215                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2216                         && size > 0
2217                         && copy_to_user(ctl->data, buf, size) != 0)
2218                 retval = -EFAULT;
2219
2220         kfree(buf);
2221         return retval;
2222 }
2223
2224 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2225 {
2226         struct usbdevfs_ioctl   ctrl;
2227
2228         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2229                 return -EFAULT;
2230         return proc_ioctl(ps, &ctrl);
2231 }
2232
2233 #ifdef CONFIG_COMPAT
2234 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2235 {
2236         struct usbdevfs_ioctl32 ioc32;
2237         struct usbdevfs_ioctl ctrl;
2238
2239         if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2240                 return -EFAULT;
2241         ctrl.ifno = ioc32.ifno;
2242         ctrl.ioctl_code = ioc32.ioctl_code;
2243         ctrl.data = compat_ptr(ioc32.data);
2244         return proc_ioctl(ps, &ctrl);
2245 }
2246 #endif
2247
2248 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2249 {
2250         unsigned portnum;
2251         int rc;
2252
2253         if (get_user(portnum, (unsigned __user *) arg))
2254                 return -EFAULT;
2255         rc = usb_hub_claim_port(ps->dev, portnum, ps);
2256         if (rc == 0)
2257                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2258                         portnum, task_pid_nr(current), current->comm);
2259         return rc;
2260 }
2261
2262 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2263 {
2264         unsigned portnum;
2265
2266         if (get_user(portnum, (unsigned __user *) arg))
2267                 return -EFAULT;
2268         return usb_hub_release_port(ps->dev, portnum, ps);
2269 }
2270
2271 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2272 {
2273         __u32 caps;
2274
2275         caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2276                         USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2277                         USBDEVFS_CAP_DROP_PRIVILEGES | USBDEVFS_CAP_CONNINFO_EX;
2278         if (!ps->dev->bus->no_stop_on_short)
2279                 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2280         if (ps->dev->bus->sg_tablesize)
2281                 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2282
2283         if (put_user(caps, (__u32 __user *)arg))
2284                 return -EFAULT;
2285
2286         return 0;
2287 }
2288
2289 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2290 {
2291         struct usbdevfs_disconnect_claim dc;
2292         struct usb_interface *intf;
2293
2294         if (copy_from_user(&dc, arg, sizeof(dc)))
2295                 return -EFAULT;
2296
2297         intf = usb_ifnum_to_if(ps->dev, dc.interface);
2298         if (!intf)
2299                 return -EINVAL;
2300
2301         if (intf->dev.driver) {
2302                 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2303
2304                 if (ps->privileges_dropped)
2305                         return -EACCES;
2306
2307                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2308                                 strncmp(dc.driver, intf->dev.driver->name,
2309                                         sizeof(dc.driver)) != 0)
2310                         return -EBUSY;
2311
2312                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2313                                 strncmp(dc.driver, intf->dev.driver->name,
2314                                         sizeof(dc.driver)) == 0)
2315                         return -EBUSY;
2316
2317                 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2318                 usb_driver_release_interface(driver, intf);
2319         }
2320
2321         return claimintf(ps, dc.interface);
2322 }
2323
2324 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2325 {
2326         unsigned num_streams, num_eps;
2327         struct usb_host_endpoint **eps;
2328         struct usb_interface *intf;
2329         int r;
2330
2331         r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2332                                    &eps, &intf);
2333         if (r)
2334                 return r;
2335
2336         destroy_async_on_interface(ps,
2337                                    intf->altsetting[0].desc.bInterfaceNumber);
2338
2339         r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2340         kfree(eps);
2341         return r;
2342 }
2343
2344 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2345 {
2346         unsigned num_eps;
2347         struct usb_host_endpoint **eps;
2348         struct usb_interface *intf;
2349         int r;
2350
2351         r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2352         if (r)
2353                 return r;
2354
2355         destroy_async_on_interface(ps,
2356                                    intf->altsetting[0].desc.bInterfaceNumber);
2357
2358         r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2359         kfree(eps);
2360         return r;
2361 }
2362
2363 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2364 {
2365         u32 data;
2366
2367         if (copy_from_user(&data, arg, sizeof(data)))
2368                 return -EFAULT;
2369
2370         /* This is a one way operation. Once privileges are
2371          * dropped, you cannot regain them. You may however reissue
2372          * this ioctl to shrink the allowed interfaces mask.
2373          */
2374         ps->interface_allowed_mask &= data;
2375         ps->privileges_dropped = true;
2376
2377         return 0;
2378 }
2379
2380 /*
2381  * NOTE:  All requests here that have interface numbers as parameters
2382  * are assuming that somehow the configuration has been prevented from
2383  * changing.  But there's no mechanism to ensure that...
2384  */
2385 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2386                                 void __user *p)
2387 {
2388         struct usb_dev_state *ps = file->private_data;
2389         struct inode *inode = file_inode(file);
2390         struct usb_device *dev = ps->dev;
2391         int ret = -ENOTTY;
2392
2393         if (!(file->f_mode & FMODE_WRITE))
2394                 return -EPERM;
2395
2396         usb_lock_device(dev);
2397
2398         /* Reap operations are allowed even after disconnection */
2399         switch (cmd) {
2400         case USBDEVFS_REAPURB:
2401                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2402                 ret = proc_reapurb(ps, p);
2403                 goto done;
2404
2405         case USBDEVFS_REAPURBNDELAY:
2406                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2407                 ret = proc_reapurbnonblock(ps, p);
2408                 goto done;
2409
2410 #ifdef CONFIG_COMPAT
2411         case USBDEVFS_REAPURB32:
2412                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2413                 ret = proc_reapurb_compat(ps, p);
2414                 goto done;
2415
2416         case USBDEVFS_REAPURBNDELAY32:
2417                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2418                 ret = proc_reapurbnonblock_compat(ps, p);
2419                 goto done;
2420 #endif
2421         }
2422
2423         if (!connected(ps)) {
2424                 usb_unlock_device(dev);
2425                 return -ENODEV;
2426         }
2427
2428         switch (cmd) {
2429         case USBDEVFS_CONTROL:
2430                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2431                 ret = proc_control(ps, p);
2432                 if (ret >= 0)
2433                         inode->i_mtime = current_time(inode);
2434                 break;
2435
2436         case USBDEVFS_BULK:
2437                 snoop(&dev->dev, "%s: BULK\n", __func__);
2438                 ret = proc_bulk(ps, p);
2439                 if (ret >= 0)
2440                         inode->i_mtime = current_time(inode);
2441                 break;
2442
2443         case USBDEVFS_RESETEP:
2444                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2445                 ret = proc_resetep(ps, p);
2446                 if (ret >= 0)
2447                         inode->i_mtime = current_time(inode);
2448                 break;
2449
2450         case USBDEVFS_RESET:
2451                 snoop(&dev->dev, "%s: RESET\n", __func__);
2452                 ret = proc_resetdevice(ps);
2453                 break;
2454
2455         case USBDEVFS_CLEAR_HALT:
2456                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2457                 ret = proc_clearhalt(ps, p);
2458                 if (ret >= 0)
2459                         inode->i_mtime = current_time(inode);
2460                 break;
2461
2462         case USBDEVFS_GETDRIVER:
2463                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2464                 ret = proc_getdriver(ps, p);
2465                 break;
2466
2467         case USBDEVFS_CONNECTINFO:
2468                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2469                 ret = proc_connectinfo(ps, p);
2470                 break;
2471
2472         case USBDEVFS_SETINTERFACE:
2473                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2474                 ret = proc_setintf(ps, p);
2475                 break;
2476
2477         case USBDEVFS_SETCONFIGURATION:
2478                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2479                 ret = proc_setconfig(ps, p);
2480                 break;
2481
2482         case USBDEVFS_SUBMITURB:
2483                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2484                 ret = proc_submiturb(ps, p);
2485                 if (ret >= 0)
2486                         inode->i_mtime = current_time(inode);
2487                 break;
2488
2489 #ifdef CONFIG_COMPAT
2490         case USBDEVFS_CONTROL32:
2491                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2492                 ret = proc_control_compat(ps, p);
2493                 if (ret >= 0)
2494                         inode->i_mtime = current_time(inode);
2495                 break;
2496
2497         case USBDEVFS_BULK32:
2498                 snoop(&dev->dev, "%s: BULK32\n", __func__);
2499                 ret = proc_bulk_compat(ps, p);
2500                 if (ret >= 0)
2501                         inode->i_mtime = current_time(inode);
2502                 break;
2503
2504         case USBDEVFS_DISCSIGNAL32:
2505                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2506                 ret = proc_disconnectsignal_compat(ps, p);
2507                 break;
2508
2509         case USBDEVFS_SUBMITURB32:
2510                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2511                 ret = proc_submiturb_compat(ps, p);
2512                 if (ret >= 0)
2513                         inode->i_mtime = current_time(inode);
2514                 break;
2515
2516         case USBDEVFS_IOCTL32:
2517                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2518                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2519                 break;
2520 #endif
2521
2522         case USBDEVFS_DISCARDURB:
2523                 snoop(&dev->dev, "%s: DISCARDURB %pK\n", __func__, p);
2524                 ret = proc_unlinkurb(ps, p);
2525                 break;
2526
2527         case USBDEVFS_DISCSIGNAL:
2528                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2529                 ret = proc_disconnectsignal(ps, p);
2530                 break;
2531
2532         case USBDEVFS_CLAIMINTERFACE:
2533                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2534                 ret = proc_claiminterface(ps, p);
2535                 break;
2536
2537         case USBDEVFS_RELEASEINTERFACE:
2538                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2539                 ret = proc_releaseinterface(ps, p);
2540                 break;
2541
2542         case USBDEVFS_IOCTL:
2543                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2544                 ret = proc_ioctl_default(ps, p);
2545                 break;
2546
2547         case USBDEVFS_CLAIM_PORT:
2548                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2549                 ret = proc_claim_port(ps, p);
2550                 break;
2551
2552         case USBDEVFS_RELEASE_PORT:
2553                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2554                 ret = proc_release_port(ps, p);
2555                 break;
2556         case USBDEVFS_GET_CAPABILITIES:
2557                 ret = proc_get_capabilities(ps, p);
2558                 break;
2559         case USBDEVFS_DISCONNECT_CLAIM:
2560                 ret = proc_disconnect_claim(ps, p);
2561                 break;
2562         case USBDEVFS_ALLOC_STREAMS:
2563                 ret = proc_alloc_streams(ps, p);
2564                 break;
2565         case USBDEVFS_FREE_STREAMS:
2566                 ret = proc_free_streams(ps, p);
2567                 break;
2568         case USBDEVFS_DROP_PRIVILEGES:
2569                 ret = proc_drop_privileges(ps, p);
2570                 break;
2571         case USBDEVFS_GET_SPEED:
2572                 ret = ps->dev->speed;
2573                 break;
2574         }
2575
2576         /* Handle variable-length commands */
2577         switch (cmd & ~IOCSIZE_MASK) {
2578         case USBDEVFS_CONNINFO_EX(0):
2579                 ret = proc_conninfo_ex(ps, p, _IOC_SIZE(cmd));
2580                 break;
2581         }
2582
2583  done:
2584         usb_unlock_device(dev);
2585         if (ret >= 0)
2586                 inode->i_atime = current_time(inode);
2587         return ret;
2588 }
2589
2590 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2591                         unsigned long arg)
2592 {
2593         int ret;
2594
2595         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2596
2597         return ret;
2598 }
2599
2600 #ifdef CONFIG_COMPAT
2601 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2602                         unsigned long arg)
2603 {
2604         int ret;
2605
2606         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2607
2608         return ret;
2609 }
2610 #endif
2611
2612 /* No kernel lock - fine */
2613 static __poll_t usbdev_poll(struct file *file,
2614                                 struct poll_table_struct *wait)
2615 {
2616         struct usb_dev_state *ps = file->private_data;
2617         __poll_t mask = 0;
2618
2619         poll_wait(file, &ps->wait, wait);
2620         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2621                 mask |= EPOLLOUT | EPOLLWRNORM;
2622         if (!connected(ps))
2623                 mask |= EPOLLHUP;
2624         if (list_empty(&ps->list))
2625                 mask |= EPOLLERR;
2626         return mask;
2627 }
2628
2629 const struct file_operations usbdev_file_operations = {
2630         .owner =          THIS_MODULE,
2631         .llseek =         no_seek_end_llseek,
2632         .read =           usbdev_read,
2633         .poll =           usbdev_poll,
2634         .unlocked_ioctl = usbdev_ioctl,
2635 #ifdef CONFIG_COMPAT
2636         .compat_ioctl =   usbdev_compat_ioctl,
2637 #endif
2638         .mmap =           usbdev_mmap,
2639         .open =           usbdev_open,
2640         .release =        usbdev_release,
2641 };
2642
2643 static void usbdev_remove(struct usb_device *udev)
2644 {
2645         struct usb_dev_state *ps;
2646         struct kernel_siginfo sinfo;
2647
2648         while (!list_empty(&udev->filelist)) {
2649                 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2650                 destroy_all_async(ps);
2651                 wake_up_all(&ps->wait);
2652                 list_del_init(&ps->list);
2653                 if (ps->discsignr) {
2654                         clear_siginfo(&sinfo);
2655                         sinfo.si_signo = ps->discsignr;
2656                         sinfo.si_errno = EPIPE;
2657                         sinfo.si_code = SI_ASYNCIO;
2658                         sinfo.si_addr = ps->disccontext;
2659                         kill_pid_info_as_cred(ps->discsignr, &sinfo,
2660                                         ps->disc_pid, ps->cred);
2661                 }
2662         }
2663 }
2664
2665 static int usbdev_notify(struct notifier_block *self,
2666                                unsigned long action, void *dev)
2667 {
2668         switch (action) {
2669         case USB_DEVICE_ADD:
2670                 break;
2671         case USB_DEVICE_REMOVE:
2672                 usbdev_remove(dev);
2673                 break;
2674         }
2675         return NOTIFY_OK;
2676 }
2677
2678 static struct notifier_block usbdev_nb = {
2679         .notifier_call =        usbdev_notify,
2680 };
2681
2682 static struct cdev usb_device_cdev;
2683
2684 int __init usb_devio_init(void)
2685 {
2686         int retval;
2687
2688         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2689                                         "usb_device");
2690         if (retval) {
2691                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2692                 goto out;
2693         }
2694         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2695         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2696         if (retval) {
2697                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2698                        USB_DEVICE_MAJOR);
2699                 goto error_cdev;
2700         }
2701         usb_register_notify(&usbdev_nb);
2702 out:
2703         return retval;
2704
2705 error_cdev:
2706         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2707         goto out;
2708 }
2709
2710 void usb_devio_cleanup(void)
2711 {
2712         usb_unregister_notify(&usbdev_nb);
2713         cdev_del(&usb_device_cdev);
2714         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2715 }