linux-kernel - Re: [PATCH v7 1/8] locking/mutex: introduce devm_mutex

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Date: Fri, 15 Mar 2024 01:33:18 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: George Stark <gnstark@...utedevices.com>
Cc: pavel@....cz, lee@...nel.org, vadimp@...dia.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, marek.behun@....cz, 
	kabel@...nel.org, linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org, 
	kernel@...utedevices.com
Subject: Re: [PATCH v7 1/8] locking/mutex: introduce devm_mutex_init()

On Thu, Mar 14, 2024 at 10:19 PM 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().

..

>  /***

Unrelated to your patch, but there are too many asterisks :-)

>   * mutex_destroy - mark a mutex unusable
>   * @lock: the mutex to be destroyed

-- 
With Best Regards,
Andy Shevchenko