[media] media-devnode: add missing mutex lock in error handler

We should protect the device unregister patch too, at the error
condition.

Signed-off-by: Max Kellermann <max@duempel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/media/media-devnode.c b/drivers/media/media-devnode.c
index 29409f440f1c..64a4b1ef3dcd 100644
--- a/drivers/media/media-devnode.c
+++ b/drivers/media/media-devnode.c
@@ -267,8 +267,11 @@ int __must_check media_devnode_register(struct media_devnode *mdev,
         return 0;
 
 error:
+        mutex_lock(&media_devnode_lock);
         cdev_del(&mdev->cdev);
         clear_bit(mdev->minor, media_devnode_nums);
+        mutex_unlock(&media_devnode_lock);
+
         return ret;
 }