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Date: Fri, 10 Aug 2018 20:51:48 +0300 From: Vlad Buslov <vladbu@...lanox.com> To: netdev@...r.kernel.org Cc: davem@...emloft.net, jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us, pablo@...filter.org, kadlec@...ckhole.kfki.hu, fw@...len.de, ast@...nel.org, daniel@...earbox.net, edumazet@...gle.com, keescook@...omium.org, marcelo.leitner@...il.com, Vlad Buslov <vladbu@...lanox.com> Subject: [PATCH net-next v2 08/15] net: sched: act_simple: remove dependency on rtnl lock Use tcf spinlock to protect private simple action data from concurrent modification during dump. (simple init already uses tcf spinlock when changing action state) Signed-off-by: Vlad Buslov <vladbu@...lanox.com> --- net/sched/act_simple.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/net/sched/act_simple.c b/net/sched/act_simple.c index aa51152e0066..18e4452574cd 100644 --- a/net/sched/act_simple.c +++ b/net/sched/act_simple.c @@ -156,10 +156,11 @@ static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a, .index = d->tcf_index, .refcnt = refcount_read(&d->tcf_refcnt) - ref, .bindcnt = atomic_read(&d->tcf_bindcnt) - bind, - .action = d->tcf_action, }; struct tcf_t t; + spin_lock_bh(&d->tcf_lock); + opt.action = d->tcf_action; if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) || nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata)) goto nla_put_failure; @@ -167,9 +168,12 @@ static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a, tcf_tm_dump(&t, &d->tcf_tm); if (nla_put_64bit(skb, TCA_DEF_TM, sizeof(t), &t, TCA_DEF_PAD)) goto nla_put_failure; + spin_unlock_bh(&d->tcf_lock); + return skb->len; nla_put_failure: + spin_unlock_bh(&d->tcf_lock); nlmsg_trim(skb, b); return -1; } -- 2.7.5
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