linux-kernel - Re: [PATCH net-next] net: sched: tbf: don't call qdisc

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Message-ID: <20220825181305.773c9e64@kernel.org>
Date:   Thu, 25 Aug 2022 18:13:05 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Zhengchao Shao <shaozhengchao@...wei.com>
Cc:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <davem@...emloft.net>, <edumazet@...gle.com>, <pabeni@...hat.com>,
        <jhs@...atatu.com>, <xiyou.wangcong@...il.com>, <jiri@...nulli.us>,
        <vladbu@...lanox.com>, <weiyongjun1@...wei.com>,
        <yuehaibing@...wei.com>
Subject: Re: [PATCH net-next] net: sched: tbf: don't call qdisc_put() while
 holding tree lock

On Fri, 26 Aug 2022 09:12:48 +0800 Zhengchao Shao wrote:
> The issue is the same to commit c2999f7fb05b ("net: sched: multiq: don't
> call qdisc_put() while holding tree lock"). Qdiscs call qdisc_put() while
> holding sch tree spinlock, which results sleeping-while-atomic BUG.
> 
> Fixes: c266f64dbfa2 ("net: sched: protect block state with mutex")
> Signed-off-by: Zhengchao Shao <shaozhengchao@...wei.com>

If it's a bug fix for a commit already in Linus's main tree it should
come with [PATCH net] in the subject (i.e. without the -next).
Please repost.