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Sender: Guenter Roeck <groeck7@gmail.com>
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Date: Thu, 22 Feb 2024 08:03:09 -0800
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Subject: Re: [PATCH 1/2] devm-helpers: Add resource managed version of mutex
 init
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From: Guenter Roeck <linux@roeck-us.net>
To: =?UTF-8?Q?Marek_Beh=C3=BAn?= <kabel@kernel.org>,
 linux-kernel@vger.kernel.org, Hans de Goede <hdegoede@redhat.com>,
 Matti Vaittinen <mazziesaccount@gmail.com>
Cc: Linus Walleij <linus.walleij@linaro.org>,
 Bartosz Golaszewski <brgl@bgdev.pl>,
 Lucas De Marchi <lucas.demarchi@intel.com>, Oded Gabbay
 <ogabbay@kernel.org>, =?UTF-8?Q?Thomas_Hellstr=C3=B6m?=
 <thomas.hellstrom@linux.intel.com>,
 Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
 Maxime Ripard <mripard@kernel.org>, Thomas Zimmermann <tzimmermann@suse.de>,
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 <4a545c16-7518-49d2-b158-7fcabe3508c5@roeck-us.net>
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In-Reply-To: <4a545c16-7518-49d2-b158-7fcabe3508c5@roeck-us.net>
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Oops, sorry for the noise. Shortened reply below.

On 2/22/24 07:24, Guenter Roeck wrote:
> On 2/22/24 06:58, 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.
>>

[ ... ]

>> +static inline int devm_mutex_init(struct device *dev, struct mutex *lock)
>> +{
>> +    mutex_init(lock);
>> +
>> +    /*
>> +     * 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
> 
> else after return is unnecessary.
> 
>> +        return 0;
>> +}
>> +
>>   #endif
> 
>