linux-kernel - Re: [PATCH net v3] NFC: hci: fix sleep in atomic context bugs in nfc_hci_hcp_message

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Message-Id: <165300901772.19017.10175085376155326113.git-patchwork-notify@kernel.org>
Date:   Fri, 20 May 2022 01:10:17 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Duoming Zhou <duoming@....edu.cn>
Cc:     krzysztof.kozlowski@...aro.org, netdev@...r.kernel.org,
        davem@...emloft.net, gregkh@...uxfoundation.org,
        alexander.deucher@....com, broonie@...nel.org,
        linux-kernel@...r.kernel.org, kuba@...nel.org, edumazet@...gle.com,
        pabeni@...hat.com
Subject: Re: [PATCH net v3] NFC: hci: fix sleep in atomic context bugs in
 nfc_hci_hcp_message_tx

Hello:

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

On Wed, 18 May 2022 19:57:33 +0800 you wrote:
> There are sleep in atomic context bugs when the request to secure
> element of st21nfca is timeout. The root cause is that kzalloc and
> alloc_skb with GFP_KERNEL parameter and mutex_lock are called in
> st21nfca_se_wt_timeout which is a timer handler. The call tree shows
> the execution paths that could lead to bugs:
> 
>    (Interrupt context)
> st21nfca_se_wt_timeout
>   nfc_hci_send_event
>     nfc_hci_hcp_message_tx
>       kzalloc(..., GFP_KERNEL) //may sleep
>       alloc_skb(..., GFP_KERNEL) //may sleep
>       mutex_lock() //may sleep
> 
> [...]

Here is the summary with links:
  - [net,v3] NFC: hci: fix sleep in atomic context bugs in nfc_hci_hcp_message_tx
    https://git.kernel.org/netdev/net/c/b413b0cb0086

You are awesome, thank you!
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