drivers/usb/storage/uas.c

   1 /*
   2  * USB Attached SCSI
   3  * Note that this is not the same as the USB Mass Storage driver
   4  *
   5  * Copyright Hans de Goede <hdegoede@redhat.com> for Red Hat, Inc. 2013 - 2014
   6  * Copyright Matthew Wilcox for Intel Corp, 2010
   7  * Copyright Sarah Sharp for Intel Corp, 2010
   8  *
   9  * Distributed under the terms of the GNU GPL, version two.
  10  */
  11
  12 #include <linux/blkdev.h>
  13 #include <linux/slab.h>
  14 #include <linux/types.h>
  15 #include <linux/module.h>
  16 #include <linux/usb.h>
  17 #include <linux/usb_usual.h>
  18 #include <linux/usb/hcd.h>
  19 #include <linux/usb/storage.h>
  20 #include <linux/usb/uas.h>
  21
  22 #include <scsi/scsi.h>
  23 #include <scsi/scsi_eh.h>
  24 #include <scsi/scsi_dbg.h>
  25 #include <scsi/scsi_cmnd.h>
  26 #include <scsi/scsi_device.h>
  27 #include <scsi/scsi_host.h>
  28 #include <scsi/scsi_tcq.h>
  29
  30 #include "uas-detect.h"
  31 #include "scsiglue.h"
  32
  33 #define MAX_CMNDS 256
  34
  35 /*
  36  * The r00-r01c specs define this version of the SENSE IU data structure.
  37  * It's still in use by several different firmware releases.
  38  */
  39 struct sense_iu_old {
  40         __u8 iu_id;
  41         __u8 rsvd1;
  42         __be16 tag;
  43         __be16 len;
  44         __u8 status;
  45         __u8 service_response;
  46         __u8 sense[SCSI_SENSE_BUFFERSIZE];
  47 };
  48
  49 struct uas_dev_info {
  50         struct usb_interface *intf;
  51         struct usb_device *udev;
  52         struct usb_anchor cmd_urbs;
  53         struct usb_anchor sense_urbs;
  54         struct usb_anchor data_urbs;
  55         unsigned long flags;
  56         int qdepth, resetting;
  57         unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe;
  58         unsigned use_streams:1;
  59         unsigned uas_sense_old:1;
  60         unsigned shutdown:1;
  61         struct scsi_cmnd *cmnd[MAX_CMNDS];
  62         spinlock_t lock;
  63         struct work_struct work;
  64         struct list_head inflight_list;
  65         struct list_head dead_list;
  66 };
  67
  68 enum {
  69         SUBMIT_STATUS_URB       = (1 << 1),
  70         ALLOC_DATA_IN_URB       = (1 << 2),
  71         SUBMIT_DATA_IN_URB      = (1 << 3),
  72         ALLOC_DATA_OUT_URB      = (1 << 4),
  73         SUBMIT_DATA_OUT_URB     = (1 << 5),
  74         ALLOC_CMD_URB           = (1 << 6),
  75         SUBMIT_CMD_URB          = (1 << 7),
  76         COMMAND_INFLIGHT        = (1 << 8),
  77         DATA_IN_URB_INFLIGHT    = (1 << 9),
  78         DATA_OUT_URB_INFLIGHT   = (1 << 10),
  79         COMMAND_COMPLETED       = (1 << 11),
  80         COMMAND_ABORTED         = (1 << 12),
  81         UNLINK_DATA_URBS        = (1 << 13),
  82         IS_IN_WORK_LIST         = (1 << 14),
  83 };
  84
  85 /* Overrides scsi_pointer */
  86 struct uas_cmd_info {
  87         unsigned int state;
  88         unsigned int stream;
  89         struct urb *cmd_urb;
  90         struct urb *data_in_urb;
  91         struct urb *data_out_urb;
  92         struct list_head list;
  93 };
  94
  95 /* I hate forward declarations, but I actually have a loop */
  96 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
  97                                 struct uas_dev_info *devinfo, gfp_t gfp);
  98 static void uas_do_work(struct work_struct *work);
  99 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller);
 100 static void uas_free_streams(struct uas_dev_info *devinfo);
 101 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *caller);
 102
 103 /* Must be called with devinfo->lock held, will temporary unlock the lock */
 104 static void uas_unlink_data_urbs(struct uas_dev_info *devinfo,
 105                                  struct uas_cmd_info *cmdinfo,
 106                                  unsigned long *lock_flags)
 107 {
 108         /*
 109          * The UNLINK_DATA_URBS flag makes sure uas_try_complete
 110          * (called by urb completion) doesn't release cmdinfo
 111          * underneath us.
 112          */
 113         cmdinfo->state |= UNLINK_DATA_URBS;
 114         spin_unlock_irqrestore(&devinfo->lock, *lock_flags);
 115
 116         if (cmdinfo->data_in_urb)
 117                 usb_unlink_urb(cmdinfo->data_in_urb);
 118         if (cmdinfo->data_out_urb)
 119                 usb_unlink_urb(cmdinfo->data_out_urb);
 120
 121         spin_lock_irqsave(&devinfo->lock, *lock_flags);
 122         cmdinfo->state &= ~UNLINK_DATA_URBS;
 123 }
 124
 125 static void uas_do_work(struct work_struct *work)
 126 {
 127         struct uas_dev_info *devinfo =
 128                 container_of(work, struct uas_dev_info, work);
 129         struct uas_cmd_info *cmdinfo;
 130         unsigned long flags;
 131         int err;
 132
 133         spin_lock_irqsave(&devinfo->lock, flags);
 134
 135         if (devinfo->resetting)
 136                 goto out;
 137
 138         list_for_each_entry(cmdinfo, &devinfo->inflight_list, list) {
 139                 struct scsi_pointer *scp = (void *)cmdinfo;
 140                 struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd,
 141                                                       SCp);
 142
 143                 if (!(cmdinfo->state & IS_IN_WORK_LIST))
 144                         continue;
 145
 146                 err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC);
 147                 if (!err)
 148                         cmdinfo->state &= ~IS_IN_WORK_LIST;
 149                 else
 150                         schedule_work(&devinfo->work);
 151         }
 152 out:
 153         spin_unlock_irqrestore(&devinfo->lock, flags);
 154 }
 155
 156 static void uas_mark_cmd_dead(struct uas_dev_info *devinfo,
 157                               struct uas_cmd_info *cmdinfo,
 158                               int result, const char *caller)
 159 {
 160         struct scsi_pointer *scp = (void *)cmdinfo;
 161         struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd, SCp);
 162
 163         uas_log_cmd_state(cmnd, caller);
 164         lockdep_assert_held(&devinfo->lock);
 165         WARN_ON_ONCE(cmdinfo->state & COMMAND_ABORTED);
 166         cmdinfo->state |= COMMAND_ABORTED;
 167         cmdinfo->state &= ~IS_IN_WORK_LIST;
 168         cmnd->result = result << 16;
 169         list_move_tail(&cmdinfo->list, &devinfo->dead_list);
 170 }
 171
 172 static void uas_abort_inflight(struct uas_dev_info *devinfo, int result,
 173                                const char *caller)
 174 {
 175         struct uas_cmd_info *cmdinfo;
 176         struct uas_cmd_info *temp;
 177         unsigned long flags;
 178
 179         spin_lock_irqsave(&devinfo->lock, flags);
 180         list_for_each_entry_safe(cmdinfo, temp, &devinfo->inflight_list, list)
 181                 uas_mark_cmd_dead(devinfo, cmdinfo, result, caller);
 182         spin_unlock_irqrestore(&devinfo->lock, flags);
 183 }
 184
 185 static void uas_add_work(struct uas_cmd_info *cmdinfo)
 186 {
 187         struct scsi_pointer *scp = (void *)cmdinfo;
 188         struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd, SCp);
 189         struct uas_dev_info *devinfo = cmnd->device->hostdata;
 190
 191         lockdep_assert_held(&devinfo->lock);
 192         cmdinfo->state |= IS_IN_WORK_LIST;
 193         schedule_work(&devinfo->work);
 194 }
 195
 196 static void uas_zap_dead(struct uas_dev_info *devinfo)
 197 {
 198         struct uas_cmd_info *cmdinfo;
 199         struct uas_cmd_info *temp;
 200         unsigned long flags;
 201
 202         spin_lock_irqsave(&devinfo->lock, flags);
 203         list_for_each_entry_safe(cmdinfo, temp, &devinfo->dead_list, list) {
 204                 struct scsi_pointer *scp = (void *)cmdinfo;
 205                 struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd,
 206                                                       SCp);
 207                 uas_log_cmd_state(cmnd, __func__);
 208                 WARN_ON_ONCE(!(cmdinfo->state & COMMAND_ABORTED));
 209                 /* all urbs are killed, clear inflight bits */
 210                 cmdinfo->state &= ~(COMMAND_INFLIGHT |
 211                                     DATA_IN_URB_INFLIGHT |
 212                                     DATA_OUT_URB_INFLIGHT);
 213                 uas_try_complete(cmnd, __func__);
 214         }
 215         spin_unlock_irqrestore(&devinfo->lock, flags);
 216 }
 217
 218 static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
 219 {
 220         struct sense_iu *sense_iu = urb->transfer_buffer;
 221         struct scsi_device *sdev = cmnd->device;
 222
 223         if (urb->actual_length > 16) {
 224                 unsigned len = be16_to_cpup(&sense_iu->len);
 225                 if (len + 16 != urb->actual_length) {
 226                         int newlen = min(len + 16, urb->actual_length) - 16;
 227                         if (newlen < 0)
 228                                 newlen = 0;
 229                         sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
 230                                 "disagrees with IU sense data length %d, "
 231                                 "using %d bytes of sense data\n", __func__,
 232                                         urb->actual_length, len, newlen);
 233                         len = newlen;
 234                 }
 235                 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
 236         }
 237
 238         cmnd->result = sense_iu->status;
 239 }
 240
 241 static void uas_sense_old(struct urb *urb, struct scsi_cmnd *cmnd)
 242 {
 243         struct sense_iu_old *sense_iu = urb->transfer_buffer;
 244         struct scsi_device *sdev = cmnd->device;
 245
 246         if (urb->actual_length > 8) {
 247                 unsigned len = be16_to_cpup(&sense_iu->len) - 2;
 248                 if (len + 8 != urb->actual_length) {
 249                         int newlen = min(len + 8, urb->actual_length) - 8;
 250                         if (newlen < 0)
 251                                 newlen = 0;
 252                         sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
 253                                 "disagrees with IU sense data length %d, "
 254                                 "using %d bytes of sense data\n", __func__,
 255                                         urb->actual_length, len, newlen);
 256                         len = newlen;
 257                 }
 258                 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
 259         }
 260
 261         cmnd->result = sense_iu->status;
 262 }
 263
 264 /*
 265  * scsi-tags go from 0 - (nr_tags - 1), uas tags need to match stream-ids,
 266  * which go from 1 - nr_streams. And we use 1 for untagged commands.
 267  */
 268 static int uas_get_tag(struct scsi_cmnd *cmnd)
 269 {
 270         int tag;
 271
 272         if (blk_rq_tagged(cmnd->request))
 273                 tag = cmnd->request->tag + 2;
 274         else
 275                 tag = 1;
 276
 277         return tag;
 278 }
 279
 280 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *caller)
 281 {
 282         struct uas_cmd_info *ci = (void *)&cmnd->SCp;
 283
 284         scmd_printk(KERN_INFO, cmnd, "%s %p tag %d, inflight:"
 285                     "%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n",
 286                     caller, cmnd, uas_get_tag(cmnd),
 287                     (ci->state & SUBMIT_STATUS_URB)     ? " s-st"  : "",
 288                     (ci->state & ALLOC_DATA_IN_URB)     ? " a-in"  : "",
 289                     (ci->state & SUBMIT_DATA_IN_URB)    ? " s-in"  : "",
 290                     (ci->state & ALLOC_DATA_OUT_URB)    ? " a-out" : "",
 291                     (ci->state & SUBMIT_DATA_OUT_URB)   ? " s-out" : "",
 292                     (ci->state & ALLOC_CMD_URB)         ? " a-cmd" : "",
 293                     (ci->state & SUBMIT_CMD_URB)        ? " s-cmd" : "",
 294                     (ci->state & COMMAND_INFLIGHT)      ? " CMD"   : "",
 295                     (ci->state & DATA_IN_URB_INFLIGHT)  ? " IN"    : "",
 296                     (ci->state & DATA_OUT_URB_INFLIGHT) ? " OUT"   : "",
 297                     (ci->state & COMMAND_COMPLETED)     ? " done"  : "",
 298                     (ci->state & COMMAND_ABORTED)       ? " abort" : "",
 299                     (ci->state & UNLINK_DATA_URBS)      ? " unlink": "",
 300                     (ci->state & IS_IN_WORK_LIST)       ? " work"  : "");
 301 }
 302
 303 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller)
 304 {
 305         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 306         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 307
 308         lockdep_assert_held(&devinfo->lock);
 309         if (cmdinfo->state & (COMMAND_INFLIGHT |
 310                               DATA_IN_URB_INFLIGHT |
 311                               DATA_OUT_URB_INFLIGHT |
 312                               UNLINK_DATA_URBS))
 313                 return -EBUSY;
 314         WARN_ON_ONCE(cmdinfo->state & COMMAND_COMPLETED);
 315         cmdinfo->state |= COMMAND_COMPLETED;
 316         usb_free_urb(cmdinfo->data_in_urb);
 317         usb_free_urb(cmdinfo->data_out_urb);
 318         if (cmdinfo->state & COMMAND_ABORTED)
 319                 scmd_printk(KERN_INFO, cmnd, "abort completed\n");
 320         list_del(&cmdinfo->list);
 321         devinfo->cmnd[uas_get_tag(cmnd) - 1] = NULL;
 322         cmnd->scsi_done(cmnd);
 323         return 0;
 324 }
 325
 326 static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
 327                           unsigned direction)
 328 {
 329         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 330         int err;
 331
 332         cmdinfo->state |= direction | SUBMIT_STATUS_URB;
 333         err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC);
 334         if (err) {
 335                 uas_add_work(cmdinfo);
 336         }
 337 }
 338
 339 static void uas_stat_cmplt(struct urb *urb)
 340 {
 341         struct iu *iu = urb->transfer_buffer;
 342         struct Scsi_Host *shost = urb->context;
 343         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
 344         struct scsi_cmnd *cmnd;
 345         struct uas_cmd_info *cmdinfo;
 346         unsigned long flags;
 347         unsigned int idx;
 348
 349         spin_lock_irqsave(&devinfo->lock, flags);
 350
 351         if (devinfo->resetting)
 352                 goto out;
 353
 354         if (urb->status) {
 355                 if (urb->status == -ENOENT) {
 356                         dev_err(&urb->dev->dev, "stat urb: killed, stream %d\n",
 357                                 urb->stream_id);
 358                 } else {
 359                         dev_err(&urb->dev->dev, "stat urb: status %d\n",
 360                                 urb->status);
 361                 }
 362                 goto out;
 363         }
 364
 365         idx = be16_to_cpup(&iu->tag) - 1;
 366         if (idx >= MAX_CMNDS || !devinfo->cmnd[idx]) {
 367                 dev_err(&urb->dev->dev,
 368                         "stat urb: no pending cmd for tag %d\n", idx + 1);
 369                 goto out;
 370         }
 371
 372         cmnd = devinfo->cmnd[idx];
 373         cmdinfo = (void *)&cmnd->SCp;
 374         switch (iu->iu_id) {
 375         case IU_ID_STATUS:
 376                 if (urb->actual_length < 16)
 377                         devinfo->uas_sense_old = 1;
 378                 if (devinfo->uas_sense_old)
 379                         uas_sense_old(urb, cmnd);
 380                 else
 381                         uas_sense(urb, cmnd);
 382                 if (cmnd->result != 0) {
 383                         /* cancel data transfers on error */
 384                         uas_unlink_data_urbs(devinfo, cmdinfo, &flags);
 385                 }
 386                 cmdinfo->state &= ~COMMAND_INFLIGHT;
 387                 uas_try_complete(cmnd, __func__);
 388                 break;
 389         case IU_ID_READ_READY:
 390                 if (!cmdinfo->data_in_urb ||
 391                                 (cmdinfo->state & DATA_IN_URB_INFLIGHT)) {
 392                         scmd_printk(KERN_ERR, cmnd, "unexpected read rdy\n");
 393                         break;
 394                 }
 395                 uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB);
 396                 break;
 397         case IU_ID_WRITE_READY:
 398                 if (!cmdinfo->data_out_urb ||
 399                                 (cmdinfo->state & DATA_OUT_URB_INFLIGHT)) {
 400                         scmd_printk(KERN_ERR, cmnd, "unexpected write rdy\n");
 401                         break;
 402                 }
 403                 uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB);
 404                 break;
 405         default:
 406                 scmd_printk(KERN_ERR, cmnd,
 407                         "Bogus IU (%d) received on status pipe\n", iu->iu_id);
 408         }
 409 out:
 410         usb_free_urb(urb);
 411         spin_unlock_irqrestore(&devinfo->lock, flags);
 412 }
 413
 414 static void uas_data_cmplt(struct urb *urb)
 415 {
 416         struct scsi_cmnd *cmnd = urb->context;
 417         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 418         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 419         struct scsi_data_buffer *sdb = NULL;
 420         unsigned long flags;
 421
 422         spin_lock_irqsave(&devinfo->lock, flags);
 423
 424         if (cmdinfo->data_in_urb == urb) {
 425                 sdb = scsi_in(cmnd);
 426                 cmdinfo->state &= ~DATA_IN_URB_INFLIGHT;
 427         } else if (cmdinfo->data_out_urb == urb) {
 428                 sdb = scsi_out(cmnd);
 429                 cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT;
 430         }
 431         if (sdb == NULL) {
 432                 WARN_ON_ONCE(1);
 433                 goto out;
 434         }
 435
 436         if (devinfo->resetting)
 437                 goto out;
 438
 439         if (urb->status) {
 440                 if (urb->status != -ECONNRESET) {
 441                         uas_log_cmd_state(cmnd, __func__);
 442                         scmd_printk(KERN_ERR, cmnd,
 443                                 "data cmplt err %d stream %d\n",
 444                                 urb->status, urb->stream_id);
 445                 }
 446                 /* error: no data transfered */
 447                 sdb->resid = sdb->length;
 448         } else {
 449                 sdb->resid = sdb->length - urb->actual_length;
 450         }
 451         uas_try_complete(cmnd, __func__);
 452 out:
 453         spin_unlock_irqrestore(&devinfo->lock, flags);
 454 }
 455
 456 static void uas_cmd_cmplt(struct urb *urb)
 457 {
 458         struct scsi_cmnd *cmnd = urb->context;
 459
 460         if (urb->status) {
 461                 uas_log_cmd_state(cmnd, __func__);
 462                 scmd_printk(KERN_ERR, cmnd, "cmd cmplt err %d\n", urb->status);
 463         }
 464         usb_free_urb(urb);
 465 }
 466
 467 static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 468                                       unsigned int pipe, u16 stream_id,
 469                                       struct scsi_cmnd *cmnd,
 470                                       enum dma_data_direction dir)
 471 {
 472         struct usb_device *udev = devinfo->udev;
 473         struct urb *urb = usb_alloc_urb(0, gfp);
 474         struct scsi_data_buffer *sdb = (dir == DMA_FROM_DEVICE)
 475                 ? scsi_in(cmnd) : scsi_out(cmnd);
 476
 477         if (!urb)
 478                 goto out;
 479         usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length,
 480                           uas_data_cmplt, cmnd);
 481         urb->stream_id = stream_id;
 482         urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
 483         urb->sg = sdb->table.sgl;
 484  out:
 485         return urb;
 486 }
 487
 488 static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 489                                        struct Scsi_Host *shost, u16 stream_id)
 490 {
 491         struct usb_device *udev = devinfo->udev;
 492         struct urb *urb = usb_alloc_urb(0, gfp);
 493         struct sense_iu *iu;
 494
 495         if (!urb)
 496                 goto out;
 497
 498         iu = kzalloc(sizeof(*iu), gfp);
 499         if (!iu)
 500                 goto free;
 501
 502         usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
 503                                                 uas_stat_cmplt, shost);
 504         urb->stream_id = stream_id;
 505         urb->transfer_flags |= URB_FREE_BUFFER;
 506  out:
 507         return urb;
 508  free:
 509         usb_free_urb(urb);
 510         return NULL;
 511 }
 512
 513 static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 514                                         struct scsi_cmnd *cmnd)
 515 {
 516         struct usb_device *udev = devinfo->udev;
 517         struct scsi_device *sdev = cmnd->device;
 518         struct urb *urb = usb_alloc_urb(0, gfp);
 519         struct command_iu *iu;
 520         int len;
 521
 522         if (!urb)
 523                 goto out;
 524
 525         len = cmnd->cmd_len - 16;
 526         if (len < 0)
 527                 len = 0;
 528         len = ALIGN(len, 4);
 529         iu = kzalloc(sizeof(*iu) + len, gfp);
 530         if (!iu)
 531                 goto free;
 532
 533         iu->iu_id = IU_ID_COMMAND;
 534         iu->tag = cpu_to_be16(uas_get_tag(cmnd));
 535         iu->prio_attr = UAS_SIMPLE_TAG;
 536         iu->len = len;
 537         int_to_scsilun(sdev->lun, &iu->lun);
 538         memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
 539
 540         usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
 541                                                         uas_cmd_cmplt, cmnd);
 542         urb->transfer_flags |= URB_FREE_BUFFER;
 543  out:
 544         return urb;
 545  free:
 546         usb_free_urb(urb);
 547         return NULL;
 548 }
 549
 550 /*
 551  * Why should I request the Status IU before sending the Command IU?  Spec
 552  * says to, but also says the device may receive them in any order.  Seems
 553  * daft to me.
 554  */
 555
 556 static struct urb *uas_submit_sense_urb(struct scsi_cmnd *cmnd,
 557                                         gfp_t gfp, unsigned int stream)
 558 {
 559         struct Scsi_Host *shost = cmnd->device->host;
 560         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
 561         struct urb *urb;
 562         int err;
 563
 564         urb = uas_alloc_sense_urb(devinfo, gfp, shost, stream);
 565         if (!urb)
 566                 return NULL;
 567         usb_anchor_urb(urb, &devinfo->sense_urbs);
 568         err = usb_submit_urb(urb, gfp);
 569         if (err) {
 570                 usb_unanchor_urb(urb);
 571                 uas_log_cmd_state(cmnd, __func__);
 572                 shost_printk(KERN_INFO, shost,
 573                              "sense urb submission error %d stream %d\n",
 574                              err, stream);
 575                 usb_free_urb(urb);
 576                 return NULL;
 577         }
 578         return urb;
 579 }
 580
 581 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
 582                            struct uas_dev_info *devinfo, gfp_t gfp)
 583 {
 584         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 585         struct urb *urb;
 586         int err;
 587
 588         lockdep_assert_held(&devinfo->lock);
 589         if (cmdinfo->state & SUBMIT_STATUS_URB) {
 590                 urb = uas_submit_sense_urb(cmnd, gfp, cmdinfo->stream);
 591                 if (!urb)
 592                         return SCSI_MLQUEUE_DEVICE_BUSY;
 593                 cmdinfo->state &= ~SUBMIT_STATUS_URB;
 594         }
 595
 596         if (cmdinfo->state & ALLOC_DATA_IN_URB) {
 597                 cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, gfp,
 598                                         devinfo->data_in_pipe, cmdinfo->stream,
 599                                         cmnd, DMA_FROM_DEVICE);
 600                 if (!cmdinfo->data_in_urb)
 601                         return SCSI_MLQUEUE_DEVICE_BUSY;
 602                 cmdinfo->state &= ~ALLOC_DATA_IN_URB;
 603         }
 604
 605         if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
 606                 usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs);
 607                 err = usb_submit_urb(cmdinfo->data_in_urb, gfp);
 608                 if (err) {
 609                         usb_unanchor_urb(cmdinfo->data_in_urb);
 610                         uas_log_cmd_state(cmnd, __func__);
 611                         scmd_printk(KERN_INFO, cmnd,
 612                                 "data in urb submission error %d stream %d\n",
 613                                 err, cmdinfo->data_in_urb->stream_id);
 614                         return SCSI_MLQUEUE_DEVICE_BUSY;
 615                 }
 616                 cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
 617                 cmdinfo->state |= DATA_IN_URB_INFLIGHT;
 618         }
 619
 620         if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
 621                 cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, gfp,
 622                                         devinfo->data_out_pipe, cmdinfo->stream,
 623                                         cmnd, DMA_TO_DEVICE);
 624                 if (!cmdinfo->data_out_urb)
 625                         return SCSI_MLQUEUE_DEVICE_BUSY;
 626                 cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
 627         }
 628
 629         if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
 630                 usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs);
 631                 err = usb_submit_urb(cmdinfo->data_out_urb, gfp);
 632                 if (err) {
 633                         usb_unanchor_urb(cmdinfo->data_out_urb);
 634                         uas_log_cmd_state(cmnd, __func__);
 635                         scmd_printk(KERN_INFO, cmnd,
 636                                 "data out urb submission error %d stream %d\n",
 637                                 err, cmdinfo->data_out_urb->stream_id);
 638                         return SCSI_MLQUEUE_DEVICE_BUSY;
 639                 }
 640                 cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
 641                 cmdinfo->state |= DATA_OUT_URB_INFLIGHT;
 642         }
 643
 644         if (cmdinfo->state & ALLOC_CMD_URB) {
 645                 cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, gfp, cmnd);
 646                 if (!cmdinfo->cmd_urb)
 647                         return SCSI_MLQUEUE_DEVICE_BUSY;
 648                 cmdinfo->state &= ~ALLOC_CMD_URB;
 649         }
 650
 651         if (cmdinfo->state & SUBMIT_CMD_URB) {
 652                 usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs);
 653                 err = usb_submit_urb(cmdinfo->cmd_urb, gfp);
 654                 if (err) {
 655                         usb_unanchor_urb(cmdinfo->cmd_urb);
 656                         uas_log_cmd_state(cmnd, __func__);
 657                         scmd_printk(KERN_INFO, cmnd,
 658                                     "cmd urb submission error %d\n", err);
 659                         return SCSI_MLQUEUE_DEVICE_BUSY;
 660                 }
 661                 cmdinfo->cmd_urb = NULL;
 662                 cmdinfo->state &= ~SUBMIT_CMD_URB;
 663                 cmdinfo->state |= COMMAND_INFLIGHT;
 664         }
 665
 666         return 0;
 667 }
 668
 669 static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
 670                                         void (*done)(struct scsi_cmnd *))
 671 {
 672         struct scsi_device *sdev = cmnd->device;
 673         struct uas_dev_info *devinfo = sdev->hostdata;
 674         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 675         unsigned long flags;
 676         unsigned int stream;
 677         int err;
 678
 679         BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
 680
 681         if ((devinfo->flags & US_FL_NO_ATA_1X) &&
 682                         (cmnd->cmnd[0] == ATA_12 || cmnd->cmnd[0] == ATA_16)) {
 683                 memcpy(cmnd->sense_buffer, usb_stor_sense_invalidCDB,
 684                        sizeof(usb_stor_sense_invalidCDB));
 685                 cmnd->result = SAM_STAT_CHECK_CONDITION;
 686                 cmnd->scsi_done(cmnd);
 687                 return 0;
 688         }
 689
 690         spin_lock_irqsave(&devinfo->lock, flags);
 691
 692         if (devinfo->resetting) {
 693                 cmnd->result = DID_ERROR << 16;
 694                 cmnd->scsi_done(cmnd);
 695                 spin_unlock_irqrestore(&devinfo->lock, flags);
 696                 return 0;
 697         }
 698
 699         stream = uas_get_tag(cmnd);
 700         if (devinfo->cmnd[stream - 1]) {
 701                 spin_unlock_irqrestore(&devinfo->lock, flags);
 702                 return SCSI_MLQUEUE_DEVICE_BUSY;
 703         }
 704
 705         cmnd->scsi_done = done;
 706
 707         memset(cmdinfo, 0, sizeof(*cmdinfo));
 708         cmdinfo->stream = stream;
 709         cmdinfo->state = SUBMIT_STATUS_URB | ALLOC_CMD_URB | SUBMIT_CMD_URB;
 710
 711         switch (cmnd->sc_data_direction) {
 712         case DMA_FROM_DEVICE:
 713                 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
 714                 break;
 715         case DMA_BIDIRECTIONAL:
 716                 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
 717         case DMA_TO_DEVICE:
 718                 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
 719         case DMA_NONE:
 720                 break;
 721         }
 722
 723         if (!devinfo->use_streams) {
 724                 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
 725                 cmdinfo->stream = 0;
 726         }
 727
 728         err = uas_submit_urbs(cmnd, devinfo, GFP_ATOMIC);
 729         if (err) {
 730                 /* If we did nothing, give up now */
 731                 if (cmdinfo->state & SUBMIT_STATUS_URB) {
 732                         spin_unlock_irqrestore(&devinfo->lock, flags);
 733                         return SCSI_MLQUEUE_DEVICE_BUSY;
 734                 }
 735                 uas_add_work(cmdinfo);
 736         }
 737
 738         devinfo->cmnd[stream - 1] = cmnd;
 739         list_add_tail(&cmdinfo->list, &devinfo->inflight_list);
 740         spin_unlock_irqrestore(&devinfo->lock, flags);
 741         return 0;
 742 }
 743
 744 static DEF_SCSI_QCMD(uas_queuecommand)
 745
 746 static int uas_eh_bus_reset_handler(struct scsi_cmnd *cmnd)
 747 {
 748         struct scsi_device *sdev = cmnd->device;
 749         struct uas_dev_info *devinfo = sdev->hostdata;
 750         struct usb_device *udev = devinfo->udev;
 751         unsigned long flags;
 752         int err;
 753
 754         err = usb_lock_device_for_reset(udev, devinfo->intf);
 755         if (err) {
 756                 shost_printk(KERN_ERR, sdev->host,
 757                              "%s FAILED to get lock err %d\n", __func__, err);
 758                 return FAILED;
 759         }
 760
 761         shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__);
 762
 763         spin_lock_irqsave(&devinfo->lock, flags);
 764         devinfo->resetting = 1;
 765         spin_unlock_irqrestore(&devinfo->lock, flags);
 766
 767         uas_abort_inflight(devinfo, DID_RESET, __func__);
 768         usb_kill_anchored_urbs(&devinfo->cmd_urbs);
 769         usb_kill_anchored_urbs(&devinfo->sense_urbs);
 770         usb_kill_anchored_urbs(&devinfo->data_urbs);
 771         uas_zap_dead(devinfo);
 772         err = usb_reset_device(udev);
 773
 774         spin_lock_irqsave(&devinfo->lock, flags);
 775         devinfo->resetting = 0;
 776         spin_unlock_irqrestore(&devinfo->lock, flags);
 777
 778         usb_unlock_device(udev);
 779
 780         if (err) {
 781                 shost_printk(KERN_INFO, sdev->host, "%s FAILED\n", __func__);
 782                 return FAILED;
 783         }
 784
 785         shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__);
 786         return SUCCESS;
 787 }
 788
 789 static int uas_slave_alloc(struct scsi_device *sdev)
 790 {
 791         sdev->hostdata = (void *)sdev->host->hostdata;
 792
 793         /* USB has unusual DMA-alignment requirements: Although the
 794          * starting address of each scatter-gather element doesn't matter,
 795          * the length of each element except the last must be divisible
 796          * by the Bulk maxpacket value.  There's currently no way to
 797          * express this by block-layer constraints, so we'll cop out
 798          * and simply require addresses to be aligned at 512-byte
 799          * boundaries.  This is okay since most block I/O involves
 800          * hardware sectors that are multiples of 512 bytes in length,
 801          * and since host controllers up through USB 2.0 have maxpacket
 802          * values no larger than 512.
 803          *
 804          * But it doesn't suffice for Wireless USB, where Bulk maxpacket
 805          * values can be as large as 2048.  To make that work properly
 806          * will require changes to the block layer.
 807          */
 808         blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
 809
 810         return 0;
 811 }
 812
 813 static int uas_slave_configure(struct scsi_device *sdev)
 814 {
 815         struct uas_dev_info *devinfo = sdev->hostdata;
 816
 817         if (devinfo->flags & US_FL_NO_REPORT_OPCODES)
 818                 sdev->no_report_opcodes = 1;
 819
 820         scsi_set_tag_type(sdev, MSG_ORDERED_TAG);
 821         scsi_activate_tcq(sdev, devinfo->qdepth - 2);
 822         return 0;
 823 }
 824
 825 static struct scsi_host_template uas_host_template = {
 826         .module = THIS_MODULE,
 827         .name = "uas",
 828         .queuecommand = uas_queuecommand,
 829         .slave_alloc = uas_slave_alloc,
 830         .slave_configure = uas_slave_configure,
 831         .eh_bus_reset_handler = uas_eh_bus_reset_handler,
 832         .can_queue = 65536,     /* Is there a limit on the _host_ ? */
 833         .this_id = -1,
 834         .sg_tablesize = SG_NONE,
 835         .cmd_per_lun = 1,       /* until we override it */
 836         .skip_settle_delay = 1,
 837         .ordered_tag = 1,
 838 };
 839
 840 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
 841                     vendorName, productName, useProtocol, useTransport, \
 842                     initFunction, flags) \
 843 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
 844         .driver_info = (flags) }
 845
 846 static struct usb_device_id uas_usb_ids[] = {
 847 #       include "unusual_uas.h"
 848         { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
 849         { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
 850         /* 0xaa is a prototype device I happen to have access to */
 851         { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, 0xaa) },
 852         { }
 853 };
 854 MODULE_DEVICE_TABLE(usb, uas_usb_ids);
 855
 856 #undef UNUSUAL_DEV
 857
 858 static int uas_switch_interface(struct usb_device *udev,
 859                                 struct usb_interface *intf)
 860 {
 861         int alt;
 862
 863         alt = uas_find_uas_alt_setting(intf);
 864         if (alt < 0)
 865                 return alt;
 866
 867         return usb_set_interface(udev,
 868                         intf->altsetting[0].desc.bInterfaceNumber, alt);
 869 }
 870
 871 static int uas_configure_endpoints(struct uas_dev_info *devinfo)
 872 {
 873         struct usb_host_endpoint *eps[4] = { };
 874         struct usb_device *udev = devinfo->udev;
 875         int r;
 876
 877         devinfo->uas_sense_old = 0;
 878
 879         r = uas_find_endpoints(devinfo->intf->cur_altsetting, eps);
 880         if (r)
 881                 return r;
 882
 883         devinfo->cmd_pipe = usb_sndbulkpipe(udev,
 884                                             usb_endpoint_num(&eps[0]->desc));
 885         devinfo->status_pipe = usb_rcvbulkpipe(udev,
 886                                             usb_endpoint_num(&eps[1]->desc));
 887         devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
 888                                             usb_endpoint_num(&eps[2]->desc));
 889         devinfo->data_out_pipe = usb_sndbulkpipe(udev,
 890                                             usb_endpoint_num(&eps[3]->desc));
 891
 892         if (udev->speed != USB_SPEED_SUPER) {
 893                 devinfo->qdepth = 32;
 894                 devinfo->use_streams = 0;
 895         } else {
 896                 devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1,
 897                                                     3, MAX_CMNDS, GFP_NOIO);
 898                 if (devinfo->qdepth < 0)
 899                         return devinfo->qdepth;
 900                 devinfo->use_streams = 1;
 901         }
 902
 903         return 0;
 904 }
 905
 906 static void uas_free_streams(struct uas_dev_info *devinfo)
 907 {
 908         struct usb_device *udev = devinfo->udev;
 909         struct usb_host_endpoint *eps[3];
 910
 911         eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
 912         eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
 913         eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
 914         usb_free_streams(devinfo->intf, eps, 3, GFP_NOIO);
 915 }
 916
 917 static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
 918 {
 919         int result = -ENOMEM;
 920         struct Scsi_Host *shost = NULL;
 921         struct uas_dev_info *devinfo;
 922         struct usb_device *udev = interface_to_usbdev(intf);
 923
 924         if (!uas_use_uas_driver(intf, id))
 925                 return -ENODEV;
 926
 927         if (uas_switch_interface(udev, intf))
 928                 return -ENODEV;
 929
 930         shost = scsi_host_alloc(&uas_host_template,
 931                                 sizeof(struct uas_dev_info));
 932         if (!shost)
 933                 goto set_alt0;
 934
 935         shost->max_cmd_len = 16 + 252;
 936         shost->max_id = 1;
 937         shost->max_lun = 256;
 938         shost->max_channel = 0;
 939         shost->sg_tablesize = udev->bus->sg_tablesize;
 940
 941         devinfo = (struct uas_dev_info *)shost->hostdata;
 942         devinfo->intf = intf;
 943         devinfo->udev = udev;
 944         devinfo->resetting = 0;
 945         devinfo->shutdown = 0;
 946         devinfo->flags = id->driver_info;
 947         usb_stor_adjust_quirks(udev, &devinfo->flags);
 948         init_usb_anchor(&devinfo->cmd_urbs);
 949         init_usb_anchor(&devinfo->sense_urbs);
 950         init_usb_anchor(&devinfo->data_urbs);
 951         spin_lock_init(&devinfo->lock);
 952         INIT_WORK(&devinfo->work, uas_do_work);
 953         INIT_LIST_HEAD(&devinfo->inflight_list);
 954         INIT_LIST_HEAD(&devinfo->dead_list);
 955
 956         result = uas_configure_endpoints(devinfo);
 957         if (result)
 958                 goto set_alt0;
 959
 960         result = scsi_init_shared_tag_map(shost, devinfo->qdepth - 2);
 961         if (result)
 962                 goto free_streams;
 963
 964         usb_set_intfdata(intf, shost);
 965         result = scsi_add_host(shost, &intf->dev);
 966         if (result)
 967                 goto free_streams;
 968
 969         scsi_scan_host(shost);
 970         return result;
 971
 972 free_streams:
 973         uas_free_streams(devinfo);
 974         usb_set_intfdata(intf, NULL);
 975 set_alt0:
 976         usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
 977         if (shost)
 978                 scsi_host_put(shost);
 979         return result;
 980 }
 981
 982 static int uas_pre_reset(struct usb_interface *intf)
 983 {
 984         struct Scsi_Host *shost = usb_get_intfdata(intf);
 985         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
 986         unsigned long flags;
 987
 988         if (devinfo->shutdown)
 989                 return 0;
 990
 991         /* Block new requests */
 992         spin_lock_irqsave(shost->host_lock, flags);
 993         scsi_block_requests(shost);
 994         spin_unlock_irqrestore(shost->host_lock, flags);
 995
 996         /* Wait for any pending requests to complete */
 997         flush_work(&devinfo->work);
 998         if (usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000) == 0) {
 999                 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1000                 return 1;
1001         }
1002
1003         uas_free_streams(devinfo);
1004
1005         return 0;
1006 }
1007
1008 static int uas_post_reset(struct usb_interface *intf)
1009 {
1010         struct Scsi_Host *shost = usb_get_intfdata(intf);
1011         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1012         unsigned long flags;
1013
1014         if (devinfo->shutdown)
1015                 return 0;
1016
1017         if (uas_configure_endpoints(devinfo) != 0) {
1018                 shost_printk(KERN_ERR, shost,
1019                              "%s: alloc streams error after reset", __func__);
1020                 return 1;
1021         }
1022
1023         spin_lock_irqsave(shost->host_lock, flags);
1024         scsi_report_bus_reset(shost, 0);
1025         spin_unlock_irqrestore(shost->host_lock, flags);
1026
1027         scsi_unblock_requests(shost);
1028
1029         return 0;
1030 }
1031
1032 static int uas_suspend(struct usb_interface *intf, pm_message_t message)
1033 {
1034         struct Scsi_Host *shost = usb_get_intfdata(intf);
1035         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1036
1037         /* Wait for any pending requests to complete */
1038         flush_work(&devinfo->work);
1039         if (usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000) == 0) {
1040                 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1041                 return -ETIME;
1042         }
1043
1044         return 0;
1045 }
1046
1047 static int uas_resume(struct usb_interface *intf)
1048 {
1049         return 0;
1050 }
1051
1052 static int uas_reset_resume(struct usb_interface *intf)
1053 {
1054         struct Scsi_Host *shost = usb_get_intfdata(intf);
1055         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1056         unsigned long flags;
1057
1058         if (uas_configure_endpoints(devinfo) != 0) {
1059                 shost_printk(KERN_ERR, shost,
1060                              "%s: alloc streams error after reset", __func__);
1061                 return -EIO;
1062         }
1063
1064         spin_lock_irqsave(shost->host_lock, flags);
1065         scsi_report_bus_reset(shost, 0);
1066         spin_unlock_irqrestore(shost->host_lock, flags);
1067
1068         return 0;
1069 }
1070
1071 static void uas_disconnect(struct usb_interface *intf)
1072 {
1073         struct Scsi_Host *shost = usb_get_intfdata(intf);
1074         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1075         unsigned long flags;
1076
1077         spin_lock_irqsave(&devinfo->lock, flags);
1078         devinfo->resetting = 1;
1079         spin_unlock_irqrestore(&devinfo->lock, flags);
1080
1081         cancel_work_sync(&devinfo->work);
1082         uas_abort_inflight(devinfo, DID_NO_CONNECT, __func__);
1083         usb_kill_anchored_urbs(&devinfo->cmd_urbs);
1084         usb_kill_anchored_urbs(&devinfo->sense_urbs);
1085         usb_kill_anchored_urbs(&devinfo->data_urbs);
1086         uas_zap_dead(devinfo);
1087         scsi_remove_host(shost);
1088         uas_free_streams(devinfo);
1089         scsi_host_put(shost);
1090 }
1091
1092 /*
1093  * Put the device back in usb-storage mode on shutdown, as some BIOS-es
1094  * hang on reboot when the device is still in uas mode. Note the reset is
1095  * necessary as some devices won't revert to usb-storage mode without it.
1096  */
1097 static void uas_shutdown(struct device *dev)
1098 {
1099         struct usb_interface *intf = to_usb_interface(dev);
1100         struct usb_device *udev = interface_to_usbdev(intf);
1101         struct Scsi_Host *shost = usb_get_intfdata(intf);
1102         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1103
1104         if (system_state != SYSTEM_RESTART)
1105                 return;
1106
1107         devinfo->shutdown = 1;
1108         uas_free_streams(devinfo);
1109         usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
1110         usb_reset_device(udev);
1111 }
1112
1113 static struct usb_driver uas_driver = {
1114         .name = "uas",
1115         .probe = uas_probe,
1116         .disconnect = uas_disconnect,
1117         .pre_reset = uas_pre_reset,
1118         .post_reset = uas_post_reset,
1119         .suspend = uas_suspend,
1120         .resume = uas_resume,
1121         .reset_resume = uas_reset_resume,
1122         .drvwrap.driver.shutdown = uas_shutdown,
1123         .id_table = uas_usb_ids,
1124 };
1125
1126 module_usb_driver(uas_driver);
1127
1128 MODULE_LICENSE("GPL");
1129 MODULE_AUTHOR(
1130         "Hans de Goede <hdegoede@redhat.com>, Matthew Wilcox and Sarah Sharp");