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media: v4l: async: Return async sub-devices to subnotifier list

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When an async notifier is unregistered, the async sub-devices in the
notifier's done list will disappear with the notifier. However this is
currently also done to the sub-notifiers that remain registered. Their
sub-devices only need to be unbound while the async sub-devices themselves
need to be returned to the sub-notifier's waiting list. Do this now.

Fixes: 2cab00bb07 ("media: v4l: async: Allow binding notifiers to sub-devices")
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
This commit is contained in:
Sakari Ailus 2023-03-07 15:49:44 +02:00 committed by Hans Verkuil
parent 5ba1cc41bf
commit 5276c9df9c
1 changed files with 8 additions and 5 deletions
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13
drivers/media/v4l2-core/v4l2-async.c
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@ -416,7 +416,8 @@ static void v4l2_async_cleanup(struct v4l2_subdev *sd)
/* Unbind all sub-devices in the notifier tree. */
static void
v4l2_async_nf_unbind_all_subdevs(struct v4l2_async_notifier *notifier)
v4l2_async_nf_unbind_all_subdevs(struct v4l2_async_notifier *notifier,
bool readd)
{
struct v4l2_subdev *sd, *tmp;
@ -425,9 +426,11 @@ v4l2_async_nf_unbind_all_subdevs(struct v4l2_async_notifier *notifier)
v4l2_async_find_subdev_notifier(sd);
if (subdev_notifier)
v4l2_async_nf_unbind_all_subdevs(subdev_notifier);
v4l2_async_nf_unbind_all_subdevs(subdev_notifier, true);
v4l2_async_nf_call_unbind(notifier, sd, sd->asd);
if (readd)
list_add_tail(&sd->asd->list, &notifier->waiting);
v4l2_async_cleanup(sd);
list_move(&sd->async_list, &subdev_list);
@ -559,7 +562,7 @@ static int __v4l2_async_nf_register(struct v4l2_async_notifier *notifier)
/*
* On failure, unbind all sub-devices registered through this notifier.
*/
v4l2_async_nf_unbind_all_subdevs(notifier);
v4l2_async_nf_unbind_all_subdevs(notifier, false);
err_unlock:
mutex_unlock(&list_lock);
@ -609,7 +612,7 @@ __v4l2_async_nf_unregister(struct v4l2_async_notifier *notifier)
if (!notifier || (!notifier->v4l2_dev && !notifier->sd))
return;
v4l2_async_nf_unbind_all_subdevs(notifier);
v4l2_async_nf_unbind_all_subdevs(notifier, false);
notifier->sd = NULL;
notifier->v4l2_dev = NULL;
@ -807,7 +810,7 @@ int v4l2_async_register_subdev(struct v4l2_subdev *sd)
*/
subdev_notifier = v4l2_async_find_subdev_notifier(sd);
if (subdev_notifier)
v4l2_async_nf_unbind_all_subdevs(subdev_notifier);
v4l2_async_nf_unbind_all_subdevs(subdev_notifier, false);
if (sd->asd)
v4l2_async_nf_call_unbind(notifier, sd, sd->asd);