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

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Message-ID: <20161109060642.GA1486@kwestfie-linux.qualcomm.com>
Date:   Tue, 8 Nov 2016 22:06:43 -0800
From:   Kenneth Westfield <kwestfie@...eaurora.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Mark Brown <broonie@...nel.org>, 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: Re: [PATCH] ASoC: lpass-platform: initialize dma channel number

On Tue, Nov 08, 2016 at 02:38:52PM +0100, Arnd Bergmann wrote:
> 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(+)

Good catch.

Acked-by: Kenneth Westfield <kwestfie@...eaurora.org>

-- 
Kenneth Westfield
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, 
a Linux Foundation Collaborative Project