linux-kernel - Re: [PATCH 56/62] watchdog: tangox_wdt: Convert to use device managed functions

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Date:   Wed, 11 Jan 2017 02:52:51 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Marc Gonzalez <marc_gonzalez@...madesigns.com>
Cc:     Wim Van Sebroeck <wim@...ana.be>, linux-watchdog@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Mans Rullgard <mans@...sr.com>,
        Thibaud Cornic <thibaud_cornic@...madesigns.com>
Subject: Re: [PATCH 56/62] watchdog: tangox_wdt: Convert to use device managed
 functions

On 01/11/2017 01:07 AM, Marc Gonzalez wrote:

>> @@ -134,12 +134,15 @@ static int tangox_wdt_probe(struct platform_device *pdev)
>>  	err = clk_prepare_enable(dev->clk);
>>  	if (err)
>>  		return err;
>> +	err = devm_add_action_or_reset(&pdev->dev,
>> +				       (void(*)(void *))clk_disable_unprepare,
>> +				       dev->clk);
>> +	if (err)
>> +		return err;
>
> Hello Guenter,
>
> I would rather avoid the function pointer cast.
> How about defining an auxiliary function for the cleanup action?
>
> clk_disable_unprepare() is static inline, so gcc will have to
> define an auxiliary function either way. What do you think?
>

Not really. It would just make it more complicated to replace the
call with devm_clk_prepare_enable(), should it ever find its way
into the light of day.

Guenter