netdev - [Patch net 04/15] net_sched: remove RCU callbacks in matchall filter

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Date:   Mon, 23 Oct 2017 15:02:53 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     netdev@...r.kernel.org
Cc:     paulmck@...ux.vnet.ibm.com, jhs@...atatu.com,
        john.fastabend@...il.com, Chris Mi <chrism@...lanox.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jiri Pirko <jiri@...nulli.us>
Subject: [Patch net 04/15] net_sched: remove RCU callbacks in matchall filter

Replace call_rcu() with synchronize_rcu().

Reported-by: Chris Mi <chrism@...lanox.com>
Cc: Daniel Borkmann <daniel@...earbox.net>
Cc: Jiri Pirko <jiri@...nulli.us>
Cc: John Fastabend <john.fastabend@...il.com>
Cc: Jamal Hadi Salim <jhs@...atatu.com>
Cc: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
---
 net/sched/cls_matchall.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/net/sched/cls_matchall.c b/net/sched/cls_matchall.c
index eeac606c95ab..459614cf4186 100644
--- a/net/sched/cls_matchall.c
+++ b/net/sched/cls_matchall.c
@@ -21,7 +21,6 @@ struct cls_mall_head {
 	struct tcf_result res;
 	u32 handle;
 	u32 flags;
-	struct rcu_head	rcu;
 };
 
 static int mall_classify(struct sk_buff *skb, const struct tcf_proto *tp,
@@ -41,11 +40,8 @@ static int mall_init(struct tcf_proto *tp)
 	return 0;
 }
 
-static void mall_destroy_rcu(struct rcu_head *rcu)
+static void __mall_destroy(struct cls_mall_head *head)
 {
-	struct cls_mall_head *head = container_of(rcu, struct cls_mall_head,
-						  rcu);
-
 	tcf_exts_destroy(&head->exts);
 	kfree(head);
 }
@@ -96,7 +92,8 @@ static void mall_destroy(struct tcf_proto *tp)
 	if (tc_should_offload(dev, head->flags))
 		mall_destroy_hw_filter(tp, head, (unsigned long) head);
 
-	call_rcu(&head->rcu, mall_destroy_rcu);
+	synchronize_rcu();
+	__mall_destroy(head);
 }
 
 static void *mall_get(struct tcf_proto *tp, u32 handle)
-- 
2.13.0