netdev - Re: [PATCH 2/2] ath10k: detect conf_mutex held ath10k_drain

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Message-ID: <877dnbrxka.fsf@codeaurora.org>
Date:   Sun, 14 Feb 2021 08:08:21 +0200
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Shuah Khan <skhan@...uxfoundation.org>
Cc:     peterz@...radead.org, mingo@...hat.com, will@...nel.org,
        davem@...emloft.net, kuba@...nel.org, ath10k@...ts.infradead.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] ath10k: detect conf_mutex held ath10k_drain_tx() calls

Shuah Khan <skhan@...uxfoundation.org> writes:

> ath10k_drain_tx() must not be called with conf_mutex held as workers can
> use that also. Add call to lockdep_assert_not_held() on conf_mutex to
> detect if conf_mutex is held by the caller.
>
> The idea for this patch stemmed from coming across the comment block
> above the ath10k_drain_tx() while reviewing the conf_mutex holds during
> to debug the conf_mutex lock assert in ath10k_debug_fw_stats_request().
>
> Adding detection to assert on conf_mutex hold will help detect incorrect
> usages that could lead to locking problems when async worker routines try
> to call this routine.
>
> Link: https://lore.kernel.org/linux-wireless/871rdmu9z9.fsf@codeaurora.org/
> Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>

This can go via the same tree as patch 1:

Acked-by: Kalle Valo <kvalo@...eaurora.org>

But I can also take this to my ath tree, once patch 1 has reached it.
Just let me know what is preferred.

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