net_sched: fix suspicious RCU usage in tcindex_classify()
This patch fixes the following kernel warning:
[ 44.805900] [ INFO: suspicious RCU usage. ]
[ 44.808946] 3.17.0-rc4+ #610 Not tainted
[ 44.811831] -------------------------------
[ 44.814873] net/sched/cls_tcindex.c:84 suspicious rcu_dereference_check() usage!
Fixes: commit 331b72922c
("net: sched: RCU cls_tcindex")
Cc: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -81,7 +81,7 @@ tcindex_lookup(struct tcindex_data *p, u16 key)
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static int tcindex_classify(struct sk_buff *skb, const struct tcf_proto *tp,
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struct tcf_result *res)
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{
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struct tcindex_data *p = rcu_dereference(tp->root);
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struct tcindex_data *p = rcu_dereference_bh(tp->root);
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struct tcindex_filter_result *f;
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int key = (skb->tc_index & p->mask) >> p->shift;
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