[PATCH v2 4/7] btrfs: handle error return of close_fs_devices()

[Johannes Thumshirn <jthumshirn@suse.de>]

close_fs_devices() will be able to return an error instead of crashing
after the following patch.

Prepare btrfs_close_devices() for this.

Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
---
 fs/btrfs/volumes.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index e5864ca3bb3b..be1fd935edf7 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1143,10 +1143,10 @@ static int close_fs_devices(struct btrfs_fs_devices *fs_devices)
 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
 {
 	struct btrfs_fs_devices *seed_devices = NULL;
-	int ret;
+	int err, err2 = 0;
 
 	mutex_lock(&uuid_mutex);
-	ret = close_fs_devices(fs_devices);
+	err = close_fs_devices(fs_devices);
 	if (!fs_devices->opened) {
 		seed_devices = fs_devices->seed;
 		fs_devices->seed = NULL;
@@ -1156,10 +1156,13 @@ int btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
 	while (seed_devices) {
 		fs_devices = seed_devices;
 		seed_devices = fs_devices->seed;
-		close_fs_devices(fs_devices);
+		err2 = close_fs_devices(fs_devices);
 		free_fs_devices(fs_devices);
 	}
-	return ret;
+
+	if (err2)
+		return err2;
+	return err;
 }
 
 static int open_fs_devices(struct btrfs_fs_devices *fs_devices,
-- 
2.16.4