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media: v4l2-async: Safely unregister an non-registered async subdev

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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>
This commit is contained in:
Laurent Pinchart
2021-01-07 23:54:58 +01:00
committed by Mauro Carvalho Chehab
parent b7cdd6453c
commit 25a6436002
1 changed files with 3 additions and 0 deletions
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3
drivers/media/v4l2-core/v4l2-async.c
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@@ -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);