linux-kernel - Re: [PATCH] ASoC: mediatek: mt8186: Fix mutex double unlock in GPIO request

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Message-ID: <YqxauLOp2sWOU/uc@sirena.org.uk>
Date:   Fri, 17 Jun 2022 11:43:04 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Fei Shao <fshao@...omium.org>
Cc:     Jiaxin Yu <jiaxin.yu@...iatek.com>, alsa-devel@...a-project.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] ASoC: mediatek: mt8186: Fix mutex double unlock in GPIO
 request

On Fri, Jun 17, 2022 at 06:06:33PM +0800, Fei Shao wrote:
> The lockdep mechanism reveals an unbalanced unlocking on MT8186:
> 
>   [    2.993966] WARNING: bad unlock balance detected!
>   [    2.993971] 5.15.46-421fef3b44d7-lockdep #16 Not tainted
>   [    2.993978] -------------------------------------
>   [    2.993983] kworker/u16:1/10 is trying to release lock (gpio_request_mutex) at:
>   [    2.993994] [<ffffffdcd9adebf8>] mt8186_afe_gpio_request+0xf8/0x210
>   [    2.994012] but there are no more locks to release!
>   [    2.994017]
>   [    2.994017] other info that might help us debug this:

Please think hard before including complete backtraces in upstream
reports, they are very large and contain almost no useful information
relative to their size so often obscure the relevant content in your
message. If part of the backtrace is usefully illustrative (it often is
for search engines if nothing else) then it's usually better to pull out
the relevant sections.

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