From: Sakari Ailus <sakari.ailus@linux.intel.com>
Date: Tue, 7 Mar 2023 15:49:44 +0200
Subject: [PATCH] media: v4l: async: Return async sub-devices to subnotifier
list
References: bsc#1012628
Patch-mainline: 6.3.2
Git-commit: 5276c9df9c2ab9a43b534bfb56bdb10899cd3a22
[ Upstream commit 5276c9df9c2ab9a43b534bfb56bdb10899cd3a22 ]
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: 2cab00bb076b ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
drivers/media/v4l2-core/v4l2-async.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
index d7e9ffc7..b16b5f4c 100644
--- a/drivers/media/v4l2-core/v4l2-async.c
+++ b/drivers/media/v4l2-core/v4l2-async.c
@@ -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, ¬ifier->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);
--
2.35.3