diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index f4f41c36e70325c00a56e37cba22f80e7384336d..60d28e36f0e0f9e57379b4cf0003e6073bfb19a6 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -6196,6 +6196,8 @@ mem_cgroup_css_online(struct cgroup *cont)
 		 * call __mem_cgroup_free, so return directly
 		 */
 		mem_cgroup_put(memcg);
+		if (parent->use_hierarchy)
+			mem_cgroup_put(parent);
 	}
 	return error;
 }