diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index c6bd28e..fe6b9f9 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4990,18 +4990,12 @@
 					unsigned int event)
 {
 	struct mem_cgroup *memcg = mem_cgroup_from_css(css);
-	int ret;
 
 	if (mem_cgroup_is_root(memcg))
 		return -EINVAL;
-	css_get(&memcg->css);
-	ret = mem_cgroup_force_empty(memcg);
-	css_put(&memcg->css);
-
-	return ret;
+	return mem_cgroup_force_empty(memcg);
 }
 
-
 static u64 mem_cgroup_hierarchy_read(struct cgroup_subsys_state *css,
 				     struct cftype *cft)
 {