FROMLIST: extcon: Add the support for the capability of each property

[firefly-linux-kernel-4.4.55.git] / mm / memcontrol.c

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index d1f6dc5a715d8349313d54a75dc1017c0543d5f3..08806bb1f070c57ee30f1ec752f3e7d3034f87ce 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3661,6 +3661,7 @@ static void memcg_deactivate_kmem(struct mem_cgroup *memcg)
         * ordering is imposed by list_lru_node->lock taken by
         * memcg_drain_all_list_lrus().
         */
+       rcu_read_lock(); /* can be called from css_free w/o cgroup_mutex */
        css_for_each_descendant_pre(css, &memcg->css) {
                child = mem_cgroup_from_css(css);
                BUG_ON(child->kmemcg_id != kmemcg_id);
@@ -3668,6 +3669,8 @@ static void memcg_deactivate_kmem(struct mem_cgroup *memcg)
                if (!memcg->use_hierarchy)
                        break;
        }
+       rcu_read_unlock();
+
        memcg_drain_all_list_lrus(kmemcg_id, parent->kmemcg_id);
 
        memcg_free_cache_id(kmemcg_id);