linux-kernel - Re: [PATCH 1/2] devm-helpers: Add resource managed version of mutex init

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Message-ID: <7013bf9e-2663-4613-ae61-61872e81355b@redhat.com>
Date: Thu, 22 Feb 2024 19:33:15 +0100
From: Hans de Goede <hdegoede@...hat.com>
To: Matthew Auld <matthew.auld@...el.com>, Marek Behún
 <kabel@...nel.org>, linux-kernel@...r.kernel.org,
 Matti Vaittinen <mazziesaccount@...il.com>
Cc: Linus Walleij <linus.walleij@...aro.org>,
 Bartosz Golaszewski <brgl@...ev.pl>,
 Lucas De Marchi <lucas.demarchi@...el.com>, Oded Gabbay
 <ogabbay@...nel.org>, Thomas Hellström
 <thomas.hellstrom@...ux.intel.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
 Aleksandr Mezin <mezin.alexander@...il.com>, Jean Delvare
 <jdelvare@...e.com>, Guenter Roeck <linux@...ck-us.net>,
 Pavel Machek <pavel@....cz>, Lee Jones <lee@...nel.org>,
 Sebastian Reichel <sre@...nel.org>, Matthias Brugger
 <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 linux-gpio@...r.kernel.org, intel-xe@...ts.freedesktop.org,
 dri-devel@...ts.freedesktop.org, linux-hwmon@...r.kernel.org,
 linux-leds@...r.kernel.org, linux-pm@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 1/2] devm-helpers: Add resource managed version of mutex
 init

Hi,

On 2/22/24 17:44, Matthew Auld wrote:
> On 22/02/2024 14:58, Marek Behún wrote:
>> A few drivers are doing resource-managed mutex initialization by
>> implementing ad-hoc one-liner mutex dropping functions and using them
>> with devm_add_action_or_reset(). Help drivers avoid these repeated
>> one-liners by adding managed version of mutex initialization.

<snip>

>> index 74891802200d..70640fb96117 100644
>> --- a/include/linux/devm-helpers.h
>> +++ b/include/linux/devm-helpers.h
>> @@ -24,6 +24,8 @@
>>    */
>>     #include <linux/device.h>
>> +#include <linux/kconfig.h>
>> +#include <linux/mutex.h>
>>   #include <linux/workqueue.h>
>>     static inline void devm_delayed_work_drop(void *res)
>> @@ -76,4 +78,34 @@ static inline int devm_work_autocancel(struct device *dev,
>>       return devm_add_action(dev, devm_work_drop, w);
>>   }
>>   +static inline void devm_mutex_drop(void *res)
>> +{
>> +    mutex_destroy(res);
>> +}
>> +
>> +/**
>> + * devm_mutex_init - Resource managed mutex initialization
>> + * @dev:    Device which lifetime mutex is bound to
>> + * @lock:    Mutex to be initialized (and automatically destroyed)
>> + *
>> + * Initialize mutex which is automatically destroyed when driver is detached.
>> + * A few drivers initialize mutexes which they want destroyed before driver is
>> + * detached, for debugging purposes.
>> + * devm_mutex_init() can be used to omit the explicit mutex_destroy() call when
>> + * driver is detached.
>> + */
>> +static inline int devm_mutex_init(struct device *dev, struct mutex *lock)
>> +{
>> +    mutex_init(lock);
> 
> Do you know if this this needs __always_inline? The static lockdep key in mutex_init() should be
> different for each caller class. See c21f11d182c2 ("drm: fix drmm_mutex_init()").

That is a very good point. I believe that this should mirror mutex_init() and
the actual static inline function should be __devm_mutex_init() which takes
the key as extra argument (and calls __mutex_init()) and then make
devm_mutex_init() itself a macro mirroring the mutex_init() macro.

Regards,

Hans






> 
>> +
>> +    /*
>> +     * mutex_destroy() is an empty function if CONFIG_DEBUG_MUTEXES is
>> +     * disabled. No need to allocate an action in that case.
>> +     */
>> +    if (IS_ENABLED(CONFIG_DEBUG_MUTEXES))
>> +        return devm_add_action_or_reset(dev, devm_mutex_drop, lock);
>> +    else
>> +        return 0;
>> +}
>> +
>>   #endif
>