[PATCH v2] [media] v4l2-async: Always unregister the subdev on failure

[Alban Bedel]

In v4l2_async_test_notify() if the registered_async callback or the
complete notifier returns an error the subdev is not unregistered.
This leave paths where v4l2_async_register_subdev() can fail but
leave the subdev still registered.

Add the required calls to v4l2_device_unregister_subdev() to plug
these holes.

Signed-off-by: Alban Bedel <alban.be...@avionic-design.de>
---
Changelog:
v2: * Added the missing unbind() calls as suggested by Javier.
---
 drivers/media/v4l2-core/v4l2-async.c | 29 +++++++++++++++++------------
 1 file changed, 17 insertions(+), 12 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-async.c 
b/drivers/media/v4l2-core/v4l2-async.c
index ceb28d47c3f9..abe512d0b4cb 100644
--- a/drivers/media/v4l2-core/v4l2-async.c
+++ b/drivers/media/v4l2-core/v4l2-async.c
@@ -113,23 +113,28 @@ static int v4l2_async_test_notify(struct 
v4l2_async_notifier *notifier,
        list_move(&sd->async_list, &notifier->done);
 
        ret = v4l2_device_register_subdev(notifier->v4l2_dev, sd);
-       if (ret < 0) {
-               if (notifier->unbind)
-                       notifier->unbind(notifier, sd, asd);
-               return ret;
-       }
+       if (ret < 0)
+               goto err_subdev_register;
 
        ret = v4l2_subdev_call(sd, core, registered_async);
-       if (ret < 0 && ret != -ENOIOCTLCMD) {
-               if (notifier->unbind)
-                       notifier->unbind(notifier, sd, asd);
-               return ret;
+       if (ret < 0 && ret != -ENOIOCTLCMD)
+               goto err_subdev_call;
+
+       if (list_empty(&notifier->waiting) && notifier->complete) {
+               ret = notifier->complete(notifier);
+               if (ret < 0)
+                       goto err_subdev_call;
        }
 
-       if (list_empty(&notifier->waiting) && notifier->complete)
-               return notifier->complete(notifier);
-
        return 0;
+
+err_subdev_call:
+       v4l2_device_unregister_subdev(sd);
+err_subdev_register:
+       if (notifier->unbind)
+               notifier->unbind(notifier, sd, asd);
+
+       return ret;
 }
 
 static void v4l2_async_cleanup(struct v4l2_subdev *sd)
-- 
2.9.3

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