linux-kernel - Re: [PATCH] net/sched: use spin_lock_bh() on &gact->tcf

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Message-ID: <CAM_iQpUbDR1S6hY6gPhjXrnWCQHGjQZ6JcB27zbauzdBhP76RA@mail.gmail.com>
Date:   Sun, 1 Oct 2023 11:32:28 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Chengfeng Ye <dg573847474@...il.com>
Cc:     jhs@...atatu.com, jiri@...nulli.us, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net/sched: use spin_lock_bh() on &gact->tcf_lock

On Tue, Sep 26, 2023 at 11:27 AM Chengfeng Ye <dg573847474@...il.com> wrote:
>
> I find tcf_gate_act() acquires &gact->tcf_lock without disable
> bh explicitly, as gact->tcf_lock is acquired inside timer under
> softirq context, if tcf_gate_act() is not called with bh disable
> by default or under softirq context(which I am not sure as I cannot
> find corresponding documentation), then it could be the following
> deadlocks.

Did you find this during code review or did you see a real
lockdep splat? If the latter, please include the full lockdep log.

Thanks.