staging: android: binder.c: binder_ioctl() cleanup

binder_ioctl() is quite huge and checkpatch dirty - mostly because of
the amount of code for the BINDER_WRITE_READ and BINDER_SET_CONTEXT_MGR.
Moved that code into the new binder_ioctl_write_read() and
binder_ioctl_set_ctx_mgr()

Signed-off-by: Tair Rzayev <tair.rzayev@gmail.com>
Cc: Arve Hjønnevåg <arve@android.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/android/binder.c b/drivers/staging/android/binder.c
index 2f38e44..e446f62 100644 (file)
--- a/drivers/staging/android/binder.c
+++ b/drivers/staging/android/binder.c
@@ -2593,6 +2593,106 @@ static unsigned int binder_poll(struct file *filp,
        return 0;
 }
 
+static int binder_ioctl_write_read(struct file *filp,
+                               unsigned int cmd, unsigned long arg,
+                               struct binder_thread *thread)
+{
+       int ret = 0;
+       struct binder_proc *proc = filp->private_data;
+       unsigned int size = _IOC_SIZE(cmd);
+       void __user *ubuf = (void __user *)arg;
+       struct binder_write_read bwr;
+
+       if (size != sizeof(struct binder_write_read)) {
+               ret = -EINVAL;
+               goto out;
+       }
+       if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
+               ret = -EFAULT;
+               goto out;
+       }
+       binder_debug(BINDER_DEBUG_READ_WRITE,
+                    "%d:%d write %lld at %016llx, read %lld at %016llx\n",
+                    proc->pid, thread->pid,
+                    (u64)bwr.write_size, (u64)bwr.write_buffer,
+                    (u64)bwr.read_size, (u64)bwr.read_buffer);
+
+       if (bwr.write_size > 0) {
+               ret = binder_thread_write(proc, thread,
+                                         bwr.write_buffer,
+                                         bwr.write_size,
+                                         &bwr.write_consumed);
+               trace_binder_write_done(ret);
+               if (ret < 0) {
+                       bwr.read_consumed = 0;
+                       if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
+                               ret = -EFAULT;
+                       goto out;
+               }
+       }
+       if (bwr.read_size > 0) {
+               ret = binder_thread_read(proc, thread, bwr.read_buffer,
+                                        bwr.read_size,
+                                        &bwr.read_consumed,
+                                        filp->f_flags & O_NONBLOCK);
+               trace_binder_read_done(ret);
+               if (!list_empty(&proc->todo))
+                       wake_up_interruptible(&proc->wait);
+               if (ret < 0) {
+                       if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
+                               ret = -EFAULT;
+                       goto out;
+               }
+       }
+       binder_debug(BINDER_DEBUG_READ_WRITE,
+                    "%d:%d wrote %lld of %lld, read return %lld of %lld\n",
+                    proc->pid, thread->pid,
+                    (u64)bwr.write_consumed, (u64)bwr.write_size,
+                    (u64)bwr.read_consumed, (u64)bwr.read_size);
+       if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
+               ret = -EFAULT;
+               goto out;
+       }
+out:
+       return ret;
+}
+
+static int binder_ioctl_set_ctx_mgr(struct file *filp)
+{
+       int ret = 0;
+       struct binder_proc *proc = filp->private_data;
+       kuid_t curr_euid = current_euid();
+
+       if (binder_context_mgr_node != NULL) {
+               pr_err("BINDER_SET_CONTEXT_MGR already set\n");
+               ret = -EBUSY;
+               goto out;
+       }
+       if (uid_valid(binder_context_mgr_uid)) {
+               if (!uid_eq(binder_context_mgr_uid, curr_euid)) {
+                       pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
+                              from_kuid(&init_user_ns, curr_euid),
+                              from_kuid(&init_user_ns,
+                                       binder_context_mgr_uid));
+                       ret = -EPERM;
+                       goto out;
+               }
+       } else {
+               binder_context_mgr_uid = curr_euid;
+       }
+       binder_context_mgr_node = binder_new_node(proc, 0, 0);
+       if (binder_context_mgr_node == NULL) {
+               ret = -ENOMEM;
+               goto out;
+       }
+       binder_context_mgr_node->local_weak_refs++;
+       binder_context_mgr_node->local_strong_refs++;
+       binder_context_mgr_node->has_strong_ref = 1;
+       binder_context_mgr_node->has_weak_ref = 1;
+out:
+       return ret;
+}
+
 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
        int ret;
@@ -2600,9 +2700,9 @@ static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
        struct binder_thread *thread;
        unsigned int size = _IOC_SIZE(cmd);
        void __user *ubuf = (void __user *)arg;
-       kuid_t curr_euid = current_euid();
 
-       /*pr_info("binder_ioctl: %d:%d %x %lx\n", proc->pid, current->pid, cmd, arg);*/
+       /*pr_info("binder_ioctl: %d:%d %x %lx\n",
+                       proc->pid, current->pid, cmd, arg);*/
 
        trace_binder_ioctl(cmd, arg);
 
@@ -2618,61 +2718,11 @@ static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
        }
 
        switch (cmd) {
-       case BINDER_WRITE_READ: {
-               struct binder_write_read bwr;
-
-               if (size != sizeof(struct binder_write_read)) {
-                       ret = -EINVAL;
+       case BINDER_WRITE_READ:
+               ret = binder_ioctl_write_read(filp, cmd, arg, thread);
+               if (ret)
                        goto err;
-               }
-               if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
-                       ret = -EFAULT;
-                       goto err;
-               }
-               binder_debug(BINDER_DEBUG_READ_WRITE,
-                            "%d:%d write %lld at %016llx, read %lld at %016llx\n",
-                            proc->pid, thread->pid,
-                            (u64)bwr.write_size, (u64)bwr.write_buffer,
-                            (u64)bwr.read_size, (u64)bwr.read_buffer);
-
-               if (bwr.write_size > 0) {
-                       ret = binder_thread_write(proc, thread,
-                                                 bwr.write_buffer,
-                                                 bwr.write_size,
-                                                 &bwr.write_consumed);
-                       trace_binder_write_done(ret);
-                       if (ret < 0) {
-                               bwr.read_consumed = 0;
-                               if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
-                                       ret = -EFAULT;
-                               goto err;
-                       }
-               }
-               if (bwr.read_size > 0) {
-                       ret = binder_thread_read(proc, thread, bwr.read_buffer,
-                                                bwr.read_size,
-                                                &bwr.read_consumed,
-                                                filp->f_flags & O_NONBLOCK);
-                       trace_binder_read_done(ret);
-                       if (!list_empty(&proc->todo))
-                               wake_up_interruptible(&proc->wait);
-                       if (ret < 0) {
-                               if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
-                                       ret = -EFAULT;
-                               goto err;
-                       }
-               }
-               binder_debug(BINDER_DEBUG_READ_WRITE,
-                            "%d:%d wrote %lld of %lld, read return %lld of %lld\n",
-                            proc->pid, thread->pid,
-                            (u64)bwr.write_consumed, (u64)bwr.write_size,
-                            (u64)bwr.read_consumed, (u64)bwr.read_size);
-               if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
-                       ret = -EFAULT;
-                       goto err;
-               }
                break;
-       }
        case BINDER_SET_MAX_THREADS:
                if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
                        ret = -EINVAL;
@@ -2680,31 +2730,9 @@ static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
                }
                break;
        case BINDER_SET_CONTEXT_MGR:
-               if (binder_context_mgr_node != NULL) {
-                       pr_err("BINDER_SET_CONTEXT_MGR already set\n");
-                       ret = -EBUSY;
+               ret = binder_ioctl_set_ctx_mgr(filp);
+               if (ret)
                        goto err;
-               }
-               if (uid_valid(binder_context_mgr_uid)) {
-                       if (!uid_eq(binder_context_mgr_uid, curr_euid)) {
-                               pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
-                                      from_kuid(&init_user_ns, curr_euid),
-                                      from_kuid(&init_user_ns, binder_context_mgr_uid));
-                               ret = -EPERM;
-                               goto err;
-                       }
-               } else {
-                       binder_context_mgr_uid = curr_euid;
-               }
-               binder_context_mgr_node = binder_new_node(proc, 0, 0);
-               if (binder_context_mgr_node == NULL) {
-                       ret = -ENOMEM;
-                       goto err;
-               }
-               binder_context_mgr_node->local_weak_refs++;
-               binder_context_mgr_node->local_strong_refs++;
-               binder_context_mgr_node->has_strong_ref = 1;
-               binder_context_mgr_node->has_weak_ref = 1;
                break;
        case BINDER_THREAD_EXIT:
                binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",