net, sched: respect rcu grace period on cls destruction

[firefly-linux-kernel-4.4.55.git] / net / sched / cls_cgroup.c

diff --git a/net/sched/cls_cgroup.c b/net/sched/cls_cgroup.c
index 4c85bd3a750cbb02c743779f28cbde6ceacb5ecf..c104c2019feb6245154a9149d4f685b1ab23cd18 100644 (file)
--- a/net/sched/cls_cgroup.c
+++ b/net/sched/cls_cgroup.c
@@ -130,11 +130,10 @@ static bool cls_cgroup_destroy(struct tcf_proto *tp, bool force)
 
        if (!force)
                return false;
-
-       if (head) {
-               RCU_INIT_POINTER(tp->root, NULL);
+       /* Head can still be NULL due to cls_cgroup_init(). */
+       if (head)
                call_rcu(&head->rcu, cls_cgroup_destroy_rcu);
-       }
+
        return true;
 }