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ASoC: rt5663: refine error handling

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The newly added rt5663 codec driver introduces a couple of warnings
when built with -Wmaybe-uninitialized:

codecs/rt5663.c: In function 'rt5663_set_tdm_slot':
codecs/rt5663.c:2680:2: error: 'reg' may be used uninitialized in this function [-Werror=maybe-uninitialized]
codecs/rt5663.c: In function 'rt5663_set_dai_pll':
codecs/rt5663.c:2556:12: error: 'shift' may be used uninitialized in this function [-Werror=maybe-uninitialized]
codecs/rt5663.c:2596:2: error: 'mask' may be used uninitialized in this function [-Werror=maybe-uninitialized]

We can avoid those warnings by always returning an error
from the switch() statements instead of falling through
with an uninitialized variable when we hit an unexpected
case.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: df7c52168e ("ASoC: add rt5663 codec driver")
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Arnd Bergmann 2016-09-15 17:42:21 +02:00 committed by Mark Brown
parent df7c52168e
commit 56efaed524
1 changed files with 3 additions and 0 deletions
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3
sound/soc/codecs/rt5663.c
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@ -1831,6 +1831,7 @@ static int rt5663_i2s_use_asrc(struct snd_soc_dapm_widget *source,
break;
default:
dev_err(codec->dev, "Unknown CODEC_TYPE\n");
return 1;
}
if (da_asrc_en || ad_asrc_en)
@ -2579,6 +2580,7 @@ static int rt5663_set_dai_pll(struct snd_soc_dai *dai, int pll_id, int source,
break;
default:
dev_err(codec->dev, "Unknown CODEC_TYPE\n");
return -EINVAL;
}
switch (source) {
@ -2674,6 +2676,7 @@ static int rt5663_set_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask,
break;
default:
dev_err(codec->dev, "Unknown CODEC_TYPE\n");
return -EINVAL;
}
snd_soc_update_bits(codec, reg, RT5668_TDM_MODE_MASK |