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media: rcar-vin: remove unneeded locking in async callbacks

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The locking implemented in the async notifier callbacks are unnecessary
as the global list_lock in v4l2-async.c is held whenever one of the
callbacks are called.

The locking in itself is not harmful however it produces a LOCKDEP
warning between the global v4l2-async list_lock and the rcar-vin local
locking schema. Remove the rcar-vin locking for the async callbacks to
reduce complexity and silent the false LOCKDEP warning.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Niklas Söderlund 2019-01-04 11:12:18 -05:00 committed by Mauro Carvalho Chehab
parent a86f2b590a
commit 6458afc8c4
1 changed files with 0 additions and 14 deletions
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14
drivers/media/platform/rcar-vin/rcar-core.c
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@ -542,9 +542,7 @@ static void rvin_parallel_notify_unbind(struct v4l2_async_notifier *notifier,
vin_dbg(vin, "unbind parallel subdev %s\n", subdev->name);
mutex_lock(&vin->lock);
rvin_parallel_subdevice_detach(vin);
mutex_unlock(&vin->lock);
}
static int rvin_parallel_notify_bound(struct v4l2_async_notifier *notifier,
@ -554,9 +552,7 @@ static int rvin_parallel_notify_bound(struct v4l2_async_notifier *notifier,
struct rvin_dev *vin = v4l2_dev_to_vin(notifier->v4l2_dev);
int ret;
mutex_lock(&vin->lock);
ret = rvin_parallel_subdevice_attach(vin, subdev);
mutex_unlock(&vin->lock);
if (ret)
return ret;
@ -664,7 +660,6 @@ static int rvin_group_notify_complete(struct v4l2_async_notifier *notifier)
}
/* Create all media device links between VINs and CSI-2's. */
mutex_lock(&vin->group->lock);
for (route = vin->info->routes; route->mask; route++) {
struct media_pad *source_pad, *sink_pad;
struct media_entity *source, *sink;
@ -700,7 +695,6 @@ static int rvin_group_notify_complete(struct v4l2_async_notifier *notifier)
break;
}
}
mutex_unlock(&vin->group->lock);
return ret;
}
@ -716,8 +710,6 @@ static void rvin_group_notify_unbind(struct v4l2_async_notifier *notifier,
if (vin->group->vin[i])
rvin_v4l2_unregister(vin->group->vin[i]);
mutex_lock(&vin->group->lock);
for (i = 0; i < RVIN_CSI_MAX; i++) {
if (vin->group->csi[i].fwnode != asd->match.fwnode)
continue;
@ -725,8 +717,6 @@ static void rvin_group_notify_unbind(struct v4l2_async_notifier *notifier,
vin_dbg(vin, "Unbind CSI-2 %s from slot %u\n", subdev->name, i);
break;
}
mutex_unlock(&vin->group->lock);
}
static int rvin_group_notify_bound(struct v4l2_async_notifier *notifier,
@ -736,8 +726,6 @@ static int rvin_group_notify_bound(struct v4l2_async_notifier *notifier,
struct rvin_dev *vin = v4l2_dev_to_vin(notifier->v4l2_dev);
unsigned int i;
mutex_lock(&vin->group->lock);
for (i = 0; i < RVIN_CSI_MAX; i++) {
if (vin->group->csi[i].fwnode != asd->match.fwnode)
continue;
@ -746,8 +734,6 @@ static int rvin_group_notify_bound(struct v4l2_async_notifier *notifier,
break;
}
mutex_unlock(&vin->group->lock);
return 0;
}