diff options
Diffstat (limited to 'drivers/media/video/v4l2-dev.c')
| -rw-r--r-- | drivers/media/video/v4l2-dev.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/drivers/media/video/v4l2-dev.c b/drivers/media/video/v4l2-dev.c index 70bec548d904..e4a9ed67bb2e 100644 --- a/drivers/media/video/v4l2-dev.c +++ b/drivers/media/video/v4l2-dev.c @@ -322,11 +322,19 @@ static long v4l2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) int ret = -ENODEV; if (vdev->fops->unlocked_ioctl) { - if (vdev->lock && mutex_lock_interruptible(vdev->lock)) - return -ERESTARTSYS; + bool locked = false; + + if (vdev->lock) { + /* always lock unless the cmd is marked as "don't use lock" */ + locked = !v4l2_is_known_ioctl(cmd) || + !test_bit(_IOC_NR(cmd), vdev->dont_use_lock); + + if (locked && mutex_lock_interruptible(vdev->lock)) + return -ERESTARTSYS; + } if (video_is_registered(vdev)) ret = vdev->fops->unlocked_ioctl(filp, cmd, arg); - if (vdev->lock) + if (locked) mutex_unlock(vdev->lock); } else if (vdev->fops->ioctl) { /* This code path is a replacement for the BKL. It is a major |