linux-kernel - Re: [PATCH v6 1/9] locking/mutex: introduce devm_mutex

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Date: Thu, 14 Mar 2024 11:40:25 +0100
From: Marek Behún <kabel@...nel.org>
To: George Stark <gnstark@...utedevices.com>
Cc: <andy.shevchenko@...il.com>, <pavel@....cz>, <lee@...nel.org>,
 <vadimp@...dia.com>, <mpe@...erman.id.au>, <npiggin@...il.com>,
 <christophe.leroy@...roup.eu>, <hdegoede@...hat.com>,
 <mazziesaccount@...il.com>, <peterz@...radead.org>, <mingo@...hat.com>,
 <will@...nel.org>, <longman@...hat.com>, <boqun.feng@...il.com>,
 <nikitos.tr@...il.com>, <kabel@...nel.org>, <linux-leds@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>,
 <kernel@...utedevices.com>
Subject: Re: [PATCH v6 1/9] locking/mutex: introduce devm_mutex_init

On Thu, 14 Mar 2024 11:45:23 +0300
George Stark <gnstark@...utedevices.com> wrote:

> Using of devm API leads to a certain order of releasing resources.
> So all dependent resources which are not devm-wrapped should be deleted
> with respect to devm-release order. Mutex is one of such objects that
> often is bound to other resources and has no own devm wrapping.
> Since mutex_destroy() actually does nothing in non-debug builds
> frequently calling mutex_destroy() is just ignored which is safe for now
> but wrong formally and can lead to a problem if mutex_destroy() will be
> extended so introduce devm_mutex_init()
> 
> Signed-off-by: George Stark <gnstark@...utedevices.com>
> Suggested by-by: Christophe Leroy <christophe.leroy@...roup.eu>

Reviewed-by: Marek Behún <kabel@...nel.org>