linux-kernel - Re: [alsa-devel] [PATCH 1/3] ASoC: twl4030: don't report EBUSY if no change requested.

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Message-ID: <54606446.7030907@metafoo.de>
Date:	Mon, 10 Nov 2014 08:07:50 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	NeilBrown <neilb@...e.de>, Mark Brown <broonie@...nel.org>
CC:	Mark Rutland <mark.rutland@....com>,
	GTA04 owners <gta04-owner@...delico.com>,
	alsa-devel@...a-project.org, Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Liam Girdwood <lgirdwood@...il.com>,
	linux-kernel@...r.kernel.org,
	Peter Ujfalusi <peter.ujfalusi@...com>,
	devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>
Subject: Re: [alsa-devel] [PATCH 1/3] ASoC: twl4030: don't report EBUSY if
 no change requested.

On 11/10/2014 01:45 AM, NeilBrown wrote:
> diff --git a/sound/soc/codecs/twl4030.c b/sound/soc/codecs/twl4030.c
> index b6b0cb399599..613b61cee081 100644
> --- a/sound/soc/codecs/twl4030.c
> +++ b/sound/soc/codecs/twl4030.c
> @@ -957,6 +957,16 @@ static int snd_soc_put_twl4030_opmode_enum_double(struct snd_kcontrol *kcontrol,
>   {
>   	struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
>   	struct twl4030_priv *twl4030 = snd_soc_codec_get_drvdata(codec);
> +	struct snd_ctl_elem_value currentval;
>

snd_ctl_elem_value is a bit to big to be put onto the kernel stack. Just 
using twl4030_read() should be fine.
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