btrfs: don't try to notify udev about missing devices

If we remove a missing device, bdev is null, and if we
send that off to btrfs_kobject_uevent we'll panic.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 5cce6aa..485a542 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1556,7 +1556,8 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
        ret = 0;
 
        /* Notify udev that device has changed */
-       btrfs_kobject_uevent(bdev, KOBJ_CHANGE);
+       if (bdev)
+               btrfs_kobject_uevent(bdev, KOBJ_CHANGE);
 
 error_brelse:
        brelse(bh);