From: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxx>
---
drivers/media/v4l2-core/v4l2-async.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
index 37cc0263b273..2347b7ac54d4 100644
--- a/drivers/media/v4l2-core/v4l2-async.c
+++ b/drivers/media/v4l2-core/v4l2-async.c
@@ -750,6 +750,9 @@ EXPORT_SYMBOL(v4l2_async_register_subdev);
void v4l2_async_unregister_subdev(struct v4l2_subdev *sd)
{
+ if (list_is_null(&sd->async_list))
+ return;
+
mutex_lock(&list_lock);
__v4l2_async_notifier_unregister(sd->subdev_notifier);
--
Regards,
Laurent Pinchart
