diff options
| author |   Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> | 2021-11-28 14:24:59 +0100 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2021-12-07 11:29:55 +0100 |
| commit | 468613a67bcbc9ef63fe13ec7214c34e5c7b96ba (patch) | |
| tree | 27696adcfe734b2dbc4012d62c92d75a29e6b898 | |
| parent | media: rcar-vin: Disallow unbinding and binding of individual VINs (diff) | |
media: rcar-vin: Do not hold the group lock when unregistering notifier
There is no need to hold the group lock when unregistering the notifier,
but doing so triggers a warning about a possible cyclic lock dependency.
The lock warning cover the case where a subdevice is about to be bound
to the notifier at the same time as it's unregistered. The locking for
this scenario is handled in the v4l2-async framework so it's safe to
remove the lock in the driver. This match the locking logic in the
driver for when the notifier in question is registered.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
| -rw-r--r-- | drivers/media/platform/rcar-vin/rcar-core.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/media/platform/rcar-vin/rcar-core.c b/drivers/media/platform/rcar-vin/rcar-core.c index 6d4cffdbf47a..0186ae235113 100644 --- a/drivers/media/platform/rcar-vin/rcar-core.c +++ b/drivers/media/platform/rcar-vin/rcar-core.c @@ -349,12 +349,10 @@ out: static void rvin_group_notifier_cleanup(struct rvin_dev *vin) { - mutex_lock(&vin->group->lock); if (&vin->v4l2_dev == vin->group->notifier.v4l2_dev) { v4l2_async_nf_unregister(&vin->group->notifier); v4l2_async_nf_cleanup(&vin->group->notifier); } - mutex_unlock(&vin->group->lock); } static int rvin_group_notifier_init(struct rvin_dev *vin, unsigned int port, |