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ASoC: lpass-platform: initialize dma channel number

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commit 3b89e4b77e upstream.

A bugfix accidentally removed the implicit initialization of the
dma channel number, causing undefined behavior when
v->alloc_dma_channel is NULL:

sound/soc/qcom/lpass-platform.c: In function ‘lpass_platform_pcmops_open’:
sound/soc/qcom/lpass-platform.c:83:29: error: ‘dma_ch’ may be used uninitialized in this function [-Werror=maybe-uninitialized]

This adds back an explicit initialization to zero, restoring the
previous behavior for that case.

Fixes: 022d00ee0b ("ASoC: lpass-platform: Fix broken pcm data usage")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Kenneth Westfield <kwestfie@codeaurora.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Arnd Bergmann
2016-11-08 14:38:52 +01:00
committed by Greg Kroah-Hartman
parent afd7e2b425
commit 311742c40d
1 changed files with 3 additions and 0 deletions
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3
sound/soc/qcom/lpass-platform.c
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@@ -78,6 +78,9 @@ static int lpass_platform_pcmops_open(struct snd_pcm_substream *substream)
dma_ch = 0;
if (v->alloc_dma_channel)
dma_ch = v->alloc_dma_channel(drvdata, dir);
else
dma_ch = 0;
if (dma_ch < 0)
return dma_ch;