1 files changed, 3 insertions, 0 deletions

diff --git a/mm/vmscan.c b/mm/vmscan.c
index c02c850ea349..47d5ced51f2d 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -297,10 +297,13 @@ 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);