btrfs: sysfs: normalize the error handling branch in btrfs_init_sysfs()

Although kset_unregister() can eventually remove all attribute files,
explicitly rolling back with the matching function makes the code logic
look clearer.

CC: stable@vger.kernel.org # 5.4+
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index 699b54b..74fef1f 100644 (file)
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -2321,8 +2321,11 @@ int __init btrfs_init_sysfs(void)
 
 #ifdef CONFIG_BTRFS_DEBUG
        ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group);
-       if (ret)
-               goto out2;
+       if (ret) {
+               sysfs_unmerge_group(&btrfs_kset->kobj,
+                                   &btrfs_static_feature_attr_group);
+               goto out_remove_group;
+       }
 #endif
 
        return 0;