diff options
| author | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2013-07-03 07:49:06 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2013-08-18 08:49:33 -0300 |
| commit | 8e3fbfee23fffa2f50a36ef7b7d18092d0f57f6c (patch) | |
| tree | 23e564a443edbcb4f32ba4fcf750b56587797a87 /drivers/media/v4l2-core | |
| parent | 3f359a7cb1847900bc87b3498f72c1ee848942a7 (diff) | |
[media] v4l: async: Make it safe to unregister unregistered notifier
Calling v4l2_async_notifier_unregister() on a notifier that hasn't been
registered leads to a crash. To simplify drivers, make it safe to
unregister a notifier that has not been registered.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Acked-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'drivers/media/v4l2-core')
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-async.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c index b350ab99652c..10bb62cb8d7d 100644 --- a/drivers/media/v4l2-core/v4l2-async.c +++ b/drivers/media/v4l2-core/v4l2-async.c @@ -192,6 +192,9 @@ void v4l2_async_notifier_unregister(struct v4l2_async_notifier *notifier) struct device *dev[n_subdev]; int i = 0; + if (!notifier->v4l2_dev) + return; + mutex_lock(&list_lock); list_del(¬ifier->list); @@ -225,6 +228,9 @@ void v4l2_async_notifier_unregister(struct v4l2_async_notifier *notifier) } put_device(d); } + + notifier->v4l2_dev = NULL; + /* * Don't care about the waiting list, it is initialised and populated * upon notifier registration. |