linux-kernel - Re: [PATCH 2/4] ASoC: codecs: wcd934x: Simplify with dev_err

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Date:   Mon, 17 Apr 2023 18:00:59 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Mark Brown <broonie@...nel.org>
Cc:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Banajit Goswami <bgoswami@...cinc.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] ASoC: codecs: wcd934x: Simplify with dev_err_probe

On 17/04/2023 17:58, Mark Brown wrote:
> On Mon, Apr 17, 2023 at 05:43:03PM +0200, Krzysztof Kozlowski wrote:
>> On 17/04/2023 17:33, Mark Brown wrote:
>>> On Mon, Apr 17, 2023 at 04:14:51PM +0200, Krzysztof Kozlowski wrote:
> 
>>>> -	if (IS_ERR(wcd->if_regmap)) {
>>>> -		dev_err(dev, "Failed to allocate ifc register map\n");
>>>> -		return PTR_ERR(wcd->if_regmap);
>>>> -	}
>>>> +	if (IS_ERR(wcd->if_regmap))
>>>> +		return dev_err_probe(dev, PTR_ERR(wcd->if_regmap),
>>>> +				     "Failed to allocate ifc register map\n");
> 
>>> This is a functional change.
> 
>> Hmm... I don't see it. Return value is the same, same message is
>> printed, same condition. Did I make some copy-paste error?
> 
> You've replaced an unconditional dev_err() with dev_err_probe().

Which is the core of this change... so what is here surprising? Yes,
that's functional change and I never wrote that dev_err_probe is equal
dev_err. It is similar but offers benefits and one difference - does not
print DEFER. Which is in general exactly what we want.

Best regards,
Krzysztof