btrfs: optimize check for stale device

Optimize check for stale device to only be checked when there is device
added or changed. If there is no update to the device, there is no need
to call btrfs_free_stale_device().

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 1421d711629fa572edd782e5688e72ee24198c63..2fdd2d3322aaecfc640c476cac478ed0e44723c0 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -699,7 +699,8 @@ static noinline int device_list_add(const char *path,
         * if there is new btrfs on an already registered device,
         * then remove the stale device entry.
         */
-       btrfs_free_stale_device(device);
+       if (ret > 0)
+               btrfs_free_stale_device(device);
 
        *fs_devices_ret = fs_devices;