diff options
Diffstat (limited to 'drivers/media/v4l2-core/v4l2-async.c')
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-async.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c index 5bada202b2d3..76996b516406 100644 --- a/drivers/media/v4l2-core/v4l2-async.c +++ b/drivers/media/v4l2-core/v4l2-async.c @@ -220,7 +220,14 @@ void v4l2_async_notifier_unregister(struct v4l2_async_notifier *notifier) v4l2_async_cleanup(sd); /* If we handled USB devices, we'd have to lock the parent too */ + /* + * If anyone calls v4l2_async_notifier_unregister() recursively from + * device_release_driver(), code will deadlock at list_lock, + * so unlock list_lock when device_release_driver() called. + */ + mutex_unlock(&list_lock); device_release_driver(d); + mutex_lock(&list_lock); if (notifier->unbind) notifier->unbind(notifier, sd, sd->asd); |