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

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Message-ID: <Z-1EjJSCDTWPHoEU@mini-arch>
Date: Wed, 2 Apr 2025 07:07:08 -0700
From: Stanislav Fomichev <stfomichev@...il.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,
	michael.chan@...adcom.com, 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 04/02, Taehee Yoo 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>

Oh, wow, how did I miss that... Thanks for the fix!

Acked-by: Stanislav Fomichev <sdf@...ichev.me>