diff --git a/mm/vmscan.c b/mm/vmscan.c
index f16e330e109637..c6033260e739fe 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -223,10 +223,13 @@ EXPORT_SYMBOL(register_shrinker);
  */
 void unregister_shrinker(struct shrinker *shrinker)
 {
+	if (!shrinker->nr_deferred)
+		return;
 	down_write(&shrinker_rwsem);
 	list_del(&shrinker->list);
 	up_write(&shrinker_rwsem);
 	kfree(shrinker->nr_deferred);
+	shrinker->nr_deferred = NULL;
 }
 EXPORT_SYMBOL(unregister_shrinker);