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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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.

-- 
https://patchwork.kernel.org/project/linux-wireless/list/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches