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[media] v4l: async: check for v4l2_dev in v4l2_async_notifier_register()

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Add a check for v4l2_dev to v4l2_async_notifier_register() as to fail as
early as possible since this will fail later in v4l2_async_test_notify().

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Niklas Söderlund 2017-06-13 11:30:35 -03:00 committed by Mauro Carvalho Chehab
parent 31165ad4c2
commit fbf1e94f00
1 changed files with 2 additions and 1 deletions
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3
drivers/media/v4l2-core/v4l2-async.c
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@ -148,7 +148,8 @@ int v4l2_async_notifier_register(struct v4l2_device *v4l2_dev,
struct v4l2_async_subdev *asd;
int i;
if (!notifier->num_subdevs || notifier->num_subdevs > V4L2_MAX_SUBDEVS)
if (!v4l2_dev || !notifier->num_subdevs ||
notifier->num_subdevs > V4L2_MAX_SUBDEVS)
return -EINVAL;
notifier->v4l2_dev = v4l2_dev;