memcg: fix mutex not unlocked on memcg_create_kmem_cache fail path

[platform/adaptation/renesas_rcar/renesas_kernel.git] / mm / memcontrol.c

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 19d5d42..53385cd 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3400,7 +3400,7 @@ void mem_cgroup_destroy_cache(struct kmem_cache *cachep)
 static struct kmem_cache *memcg_create_kmem_cache(struct mem_cgroup *memcg,
                                                  struct kmem_cache *s)
 {
-       struct kmem_cache *new;
+       struct kmem_cache *new = NULL;
        static char *tmp_name = NULL;
        static DEFINE_MUTEX(mutex);     /* protects tmp_name */
 
@@ -3416,7 +3416,7 @@ static struct kmem_cache *memcg_create_kmem_cache(struct mem_cgroup *memcg,
        if (!tmp_name) {
                tmp_name = kmalloc(PATH_MAX, GFP_KERNEL);
                if (!tmp_name)
-                       return NULL;
+                       goto out;
        }
 
        rcu_read_lock();
@@ -3426,12 +3426,11 @@ static struct kmem_cache *memcg_create_kmem_cache(struct mem_cgroup *memcg,
 
        new = kmem_cache_create_memcg(memcg, tmp_name, s->object_size, s->align,
                                      (s->flags & ~SLAB_PANIC), s->ctor, s);
-
        if (new)
                new->allocflags |= __GFP_KMEMCG;
        else
                new = s;
-
+out:
        mutex_unlock(&mutex);
        return new;
 }