diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 51cddc1..a7837e2 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -912,7 +912,7 @@
 
 	parent = dentry->d_parent;
 	spin_lock(&parent->d_lock);
-	spin_lock(&dentry->d_lock);
+	spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
 	list_del_init(&dentry->d_u.d_child);
 	spin_unlock(&dentry->d_lock);
 	spin_unlock(&parent->d_lock);