linux-kernel - [PATCH] ASoC: lpass-platform: initialize dma channel number

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Date:   Tue,  8 Nov 2016 14:38:52 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Mark Brown <broonie@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>, Patrick Lai <plai@...eaurora.org>,
        Banajit Goswami <bgoswami@...eaurora.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Kenneth Westfield <kwestfie@...eaurora.org>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ASoC: lpass-platform: initialize dma channel number

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: 022d00ee0b55 ("ASoC: lpass-platform: Fix broken pcm data usage")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 sound/soc/qcom/lpass-platform.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/soc/qcom/lpass-platform.c b/sound/soc/qcom/lpass-platform.c
index 07000f53db44..e223bc90b2ef 100644
--- a/sound/soc/qcom/lpass-platform.c
+++ b/sound/soc/qcom/lpass-platform.c
@@ -77,6 +77,9 @@ static int lpass_platform_pcmops_open(struct snd_pcm_substream *substream)
 
 	if (v->alloc_dma_channel)
 		dma_ch = v->alloc_dma_channel(drvdata, dir);
+	else
+		dma_ch = 0;
+
 	if (dma_ch < 0)
 		return dma_ch;
 
-- 
2.9.0