Btrfs: Return value checking in module init

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 18 insertions, 3 deletions

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index c46bc3911798..ffa02872c4d6 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -347,9 +347,24 @@ static int __init init_btrfs_fs(void)
         btrfs_init_transaction_sys();
         err = btrfs_init_cachep();
         if (err)
-                return err;
-        extent_map_init();
-        return register_filesystem(&btrfs_fs_type);
+                goto free_transaction_sys;
+        err = extent_map_init();
+        if (err)
+                goto free_cachep;
+
+        err = register_filesystem(&btrfs_fs_type);
+        if (err)
+                goto free_extent_map;
+        return 0;
+
+free_extent_map:
+        extent_map_exit();
+free_cachep:
+        btrfs_destroy_cachep();
+free_transaction_sys:
+        btrfs_exit_transaction_sys();
+        btrfs_exit_sysfs();
+        return err;
 }
 
 static void __exit exit_btrfs_fs(void)