netdev - Re: [Patch net] net_sched: fix a missing rcu barrier in mini_qdisc_pair

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Date:   Fri, 22 Dec 2017 11:24:24 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     netdev@...r.kernel.org, Jiri Pirko <jiri@...lanox.com>,
        John Fastabend <john.fastabend@...il.com>
Subject: Re: [Patch net] net_sched: fix a missing rcu barrier in
 mini_qdisc_pair_swap()

Thu, Dec 21, 2017 at 08:26:24AM CET, xiyou.wangcong@...il.com wrote:
>The rcu_barrier_bh() in mini_qdisc_pair_swap() is to wait for
>flying RCU callback installed by a previous mini_qdisc_pair_swap(),
>however we miss it on the tp_head==NULL path, which leads to that
>the RCU callback still uses miniq_old->rcu after it is freed together
>with qdisc in qdisc_graft(). So just add it on that path too.
>
>Fixes: 46209401f8f6 ("net: core: introduce mini_Qdisc and eliminate usage of tp->q for clsact fastpath ")
>Reported-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
>Tested-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
>Cc: Jiri Pirko <jiri@...lanox.com>
>Cc: John Fastabend <john.fastabend@...il.com>
>Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>

Acked-by: Jiri Pirko <jiri@...lanox.com>