linux-kernel - Re: [PATCH v1 2/2] sound: lpass-platform: Move dma channel allocation to pcmops

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Date:	Mon, 13 Jun 2016 21:39:26 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:	kbuild-all@...org, Mark Brown <broonie@...nel.org>,
	alsa-devel@...a-project.org, Patrick Lai <plai@...eaurora.org>,
	kwestfie@...eaurora.org, Banajit Goswami <bgoswami@...eaurora.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>, linux-kernel@...r.kernel.org,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: Re: [PATCH v1 2/2] sound: lpass-platform: Move dma channel
 allocation to pcmops

Hi,

[auto build test WARNING on asoc/for-next]
[also build test WARNING on v4.7-rc3 next-20160609]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Srinivas-Kandagatla/sound-lpass-cpu-add-module-licence-and-description/20160613-212531
base:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next
config: sparc64-allyesconfig (attached as .config)
compiler: sparc64-linux-gnu-gcc (Debian 5.3.1-8) 5.3.1 20160205
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=sparc64 

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.

All warnings (new ones prefixed by >>):

   sound/soc/qcom/lpass-platform.c: In function 'lpass_platform_pcmops_close':
>> sound/soc/qcom/lpass-platform.c:128:21: warning: array subscript is below array bounds [-Warray-bounds]
      drvdata->substream[ch] = substream;
                        ^

vim +128 sound/soc/qcom/lpass-platform.c

   112		if (ch >= 0 && v->free_dma_channel)
   113			v->free_dma_channel(drvdata, ch);
   114	
   115		return ret;
   116	}
   117	
   118	static int lpass_platform_pcmops_close(struct snd_pcm_substream *substream)
   119	{
   120		struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
   121		struct lpass_pcm_data *pcm_data = snd_soc_pcm_get_drvdata(soc_runtime);
   122		struct lpass_data *drvdata =
   123			snd_soc_platform_get_drvdata(soc_runtime->platform);
   124		struct lpass_variant *v = drvdata->variant;
   125		int ch = -1;
   126	
   127		if (v->free_dma_channel) {
 > 128			drvdata->substream[ch] = substream;
   129	
   130			if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
   131				ch = pcm_data->rdma_ch;
   132			else
   133				ch = pcm_data->wrdma_ch;
   134	
   135			if (ch >= 0)
   136				v->free_dma_channel(drvdata, ch);

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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