diff options
| author | Laurent Pinchart <[email protected]> | 2021-01-07 23:54:58 +0100 |
|---|---|---|
| committer | Mauro Carvalho Chehab <[email protected]> | 2021-01-27 15:49:21 +0100 |
| commit | 25a6436002d3bf2cc7483d0bfcf4373c3552f375 (patch) | |
| tree | 43ea0c6f7c93c537a3ef38ed86f4f7880301464e | |
| parent | b7cdd6453ca2c2449c5270f2d0ae88b644a1d2fb (diff) | |
media: v4l2-async: Safely unregister an non-registered async subdev
Make the V4L2 async framework a bit more robust by allowing to
unregister a non-registered async subdev. Otherwise the
v4l2_async_cleanup() will attempt to delete the async subdev from the
subdev_list with the corresponding list_head not initialized.
Signed-off-by: Laurent Pinchart <[email protected]>
Signed-off-by: Sakari Ailus <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-async.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c index 3db8e2a92982..64643b169783 100644 --- a/drivers/media/v4l2-core/v4l2-async.c +++ b/drivers/media/v4l2-core/v4l2-async.c @@ -813,6 +813,9 @@ EXPORT_SYMBOL(v4l2_async_register_subdev); void v4l2_async_unregister_subdev(struct v4l2_subdev *sd) { + if (!sd->async_list.next) + return; + mutex_lock(&list_lock); __v4l2_async_notifier_unregister(sd->subdev_notifier); |