linux-kernel - Re: [PATCH v2] mISDN: hfcpci: Fix potential deadlock on &hc->lock

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Message-Id: <169059542010.13127.16700262507413576636.git-patchwork-notify@kernel.org>
Date:   Sat, 29 Jul 2023 01:50:20 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Chengfeng Ye <dg573847474@...il.com>
Cc:     isdn@...ux-pingi.de, alexanderduyck@...com, duoming@....edu.cn,
        yangyingliang@...wei.com, davem@...emloft.net, kuba@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mISDN: hfcpci: Fix potential deadlock on &hc->lock

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@...nel.org>:

On Thu, 27 Jul 2023 08:56:19 +0000 you wrote:
> As &hc->lock is acquired by both timer _hfcpci_softirq() and hardirq
> hfcpci_int(), the timer should disable irq before lock acquisition
> otherwise deadlock could happen if the timmer is preemtped by the hadr irq.
> 
> Possible deadlock scenario:
> hfcpci_softirq() (timer)
>     -> _hfcpci_softirq()
>     -> spin_lock(&hc->lock);
>         <irq interruption>
>         -> hfcpci_int()
>         -> spin_lock(&hc->lock); (deadlock here)
> 
> [...]

Here is the summary with links:
  - [v2] mISDN: hfcpci: Fix potential deadlock on &hc->lock
    https://git.kernel.org/netdev/net/c/56c6be35fcbe

You are awesome, thank you!
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