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Subject: Re: [PATCH v2] net: nfc: fix deadlock between nfc_unregister_device
 and
 rfkill_fop_write
From: patchwork-bot+netdevbpf@kernel.org
Message-Id: 
 <176691069757.2288022.17005700112119385808.git-patchwork-notify@kernel.org>
Date: Sun, 28 Dec 2025 08:31:37 +0000
References: <20251218012355.279940-1-kartikey406@gmail.com>
In-Reply-To: <20251218012355.279940-1-kartikey406@gmail.com>
To: Deepanshu Kartikey <kartikey406@gmail.com>
Cc: krzk@kernel.org, davem@davemloft.net, edumazet@google.com,
 kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, linma@zju.edu.cn,
 netdev@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org,
 syzbot+4ef89409a235d804c6c2@syzkaller.appspotmail.com

Hello:

This patch was applied to netdev/net.git (main)
by Paolo Abeni <pabeni@redhat.com>:

On Thu, 18 Dec 2025 06:53:54 +0530 you wrote:
> A deadlock can occur between nfc_unregister_device() and rfkill_fop_write()
> due to lock ordering inversion between device_lock and rfkill_global_mutex.
> 
> The problematic lock order is:
> 
> Thread A (rfkill_fop_write):
>   rfkill_fop_write()
>     mutex_lock(&rfkill_global_mutex)
>       rfkill_set_block()
>         nfc_rfkill_set_block()
>           nfc_dev_down()
>             device_lock(&dev->dev)    <- waits for device_lock
> 
> [...]

Here is the summary with links:
  - [v2] net: nfc: fix deadlock between nfc_unregister_device and rfkill_fop_write
    https://git.kernel.org/netdev/net/c/1ab526d97a57

You are awesome, thank you!
-- 
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