1 files changed, 2 insertions, 0 deletions

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index f4f41c36e703..60d28e36f0e0 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;
 }