linux-kernel - Re: [PATCH 1/5] ASoC: dapm: If one widget fails, do not force all subsequent widgets to fail too

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Date:	Tue, 31 Jul 2012 16:09:08 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	STEricsson_nomadik_linux@...t.st.com, linus.walleij@...ricsson.com,
	arnd@...db.de, olalilja@...oo.se, ola.o.lilja@...ricsson.com,
	alsa-devel@...a-project.org
Subject: Re: [PATCH 1/5] ASoC: dapm: If one widget fails, do not force all
 subsequent widgets to fail too

On 31/07/12 15:56, Mark Brown wrote:
> On Tue, Jul 31, 2012 at 03:45:40PM +0100, Lee Jones wrote:
>> If a list of widgets is provided and one of them fails to be added as
>> a control, the present semantics fail all subsequent widgets. A better
>> solution would be to only fail that widget, but pursue in attempting
>> to add the rest of the list.
>
> To reiterate, this is in *no* way urgent or even a bug fix.

It fixes sound in our driver.

Without this the card failes to instantiate.

>>   			dev_err(dapm->dev,
>>   				"ASoC: Failed to create DAPM control %s\n",
>>   				widget->name);
>> -			ret = -ENOMEM;
>> -			break;
>
> Indeed, removing the error return is a regression.

Isn't the return code incorrect? There are a multitude of reasons why 
snd_soc_dapm_new_control() would fail. No-memory is just one of them, so 
why do we force this probable lie?

-- 
Lee Jones
Linaro ST-Ericsson Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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