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| author |   Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> | 2021-01-07 23:54:58 +0100 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2021-01-27 15:49:21 +0100 |
| commit | 25a6436002d3bf2cc7483d0bfcf4373c3552f375 (patch) | |
| tree | 43ea0c6f7c93c537a3ef38ed86f4f7880301464e /drivers/media/v4l2-core | |
| parent | media: i2c/Kconfig: Select FWNODE for OV772x sensor (diff) | |
| download | linux-dev-25a6436002d3bf2cc7483d0bfcf4373c3552f375.tar.xz linux-dev-25a6436002d3bf2cc7483d0bfcf4373c3552f375.zip | |
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 <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'drivers/media/v4l2-core')
| -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); |