linux-kernel - Re: [PATCH 2/2] ASoC: wm8994: Ensure the device is resumed in wm89xx_mic

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Date:   Fri, 28 Aug 2020 10:50:33 +0200
From:   Sylwester Nawrocki <s.nawrocki@...sung.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     broonie@...nel.org, lgirdwood@...il.com,
        ckeepax@...nsource.cirrus.com, patches@...nsource.cirrus.com,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        m.szyprowski@...sung.com, b.zolnierkie@...sung.com
Subject: Re: [PATCH 2/2] ASoC: wm8994: Ensure the device is resumed in
 wm89xx_mic_detect functions

On 28.08.2020 08:48, Krzysztof Kozlowski wrote:
>> diff --git a/sound/soc/codecs/wm8994.c b/sound/soc/codecs/wm8994.c
>> index b3ba053..fc9ea19 100644
>> --- a/sound/soc/codecs/wm8994.c
>> +++ b/sound/soc/codecs/wm8994.c
>> @@ -3514,6 +3514,8 @@ int wm8994_mic_detect(struct snd_soc_component *component, struct snd_soc_jack *
>>  		return -EINVAL;
>>  	}
>>  
>> +	pm_runtime_get_sync(component->dev);

> The driver enables PM runtime unconditionally so you should probably
> handle the error code here. I know that driver does not do it in other
> cases but it should not be a reason to multiple this pattern... unless
> it really does not matter as there are no runtime PM ops?

The regmap is provided by the parent MFD device (drivers/mfd/wm8994-core.c)
and that is where those runtime PM calls get propagated, we could possibly
get en error if there is something wrong with resuming the parent device.

If you don't mind I would prefer to omit the return value tests in that
fix patch. Existing callers of the wm89*_mic_detect() functions are 
ignoring the return value anyway. Probably the checks could be added 
in a separate patch. 

-- 
Thanks,
Sylwester