media: v4l: async: fix unbind error in v4l2_async_notifier_unregister()

The call to v4l2_async_cleanup() will set sd->asd to NULL so passing it to
notifier->unbind() has no effect and leaves the notifier confused. Call
the unbind() callback prior to cleaning up the subdevice to avoid this.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
index 21c748b..ca28143 100644 (file)
--- a/drivers/media/v4l2-core/v4l2-async.c
+++ b/drivers/media/v4l2-core/v4l2-async.c
@@ -206,11 +206,11 @@ void v4l2_async_notifier_unregister(struct v4l2_async_notifier *notifier)
        list_del(&notifier->list);
 
        list_for_each_entry_safe(sd, tmp, &notifier->done, async_list) {
-               v4l2_async_cleanup(sd);
-
                if (notifier->unbind)
                        notifier->unbind(notifier, sd, sd->asd);
 
+               v4l2_async_cleanup(sd);
+
                list_move(&sd->async_list, &subdev_list);
        }
 
@@ -268,11 +268,11 @@ void v4l2_async_unregister_subdev(struct v4l2_subdev *sd)
 
        list_add(&sd->asd->list, &notifier->waiting);
 
-       v4l2_async_cleanup(sd);
-
        if (notifier->unbind)
                notifier->unbind(notifier, sd, sd->asd);
 
+       v4l2_async_cleanup(sd);
+
        mutex_unlock(&list_lock);
 }
 EXPORT_SYMBOL(v4l2_async_unregister_subdev);