netdev - Re: [PATCH net] eth: bnxt: fix deadlock in the mgmt

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Message-ID: <CACKFLi=9ys55FqofX7oFtSOtYwrZbm5Cmkpts6mAGie_0ajAHg@mail.gmail.com>
Date: Wed, 2 Apr 2025 09:30:14 -0700
From: Michael Chan <michael.chan@...adcom.com>
To: Taehee Yoo <ap420073@...il.com>
Cc: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com, 
	edumazet@...gle.com, andrew+netdev@...n.ch, horms@...nel.org, 
	pavan.chebbi@...adcom.com, netdev@...r.kernel.org, romieu@...zoreil.com, 
	kuniyu@...zon.com
Subject: Re: [PATCH net] eth: bnxt: fix deadlock in the mgmt_ops

On Wed, Apr 2, 2025 at 6:31 AM Taehee Yoo <ap420073@...il.com> wrote:
>
> When queue is being reset, callbacks of mgmt_ops are called by
> netdev_nl_bind_rx_doit().
> The netdev_nl_bind_rx_doit() first acquires netdev_lock() and then calls
> callbacks.
> So, mgmt_ops callbacks should not acquire netdev_lock() internaly.
>
> The bnxt_queue_{start | stop}() calls napi_{enable | disable}() but they
> internally acquire netdev_lock().
> So, deadlock occurs.
>
> To avoid deadlock, napi_{enable | disable}_locked() should be used
> instead.
>
> Fixes: 413f0271f396 ("net: protect NAPI enablement with netdev_lock()")
> Signed-off-by: Taehee Yoo <ap420073@...il.com>

Thanks.
Reviewed-by: Michael Chan <michael.chan@...adcom.com>

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