linux-kernel - Re: sound/soc/sof/intel/hda-dai.c:265:22: warning: Value stored to 'sdev' during its initialization is never read [clang-analyzer-deadcode.DeadStores]

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Message-ID: <CAKwvOdm9-O=qcaexQ1+quRCXg6HZsABhDm=XQTfD841FL2m4Zg@mail.gmail.com>
Date:   Wed, 25 Aug 2021 16:04:56 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     kernel test robot <lkp@...el.com>,
        clang-built-linux@...glegroups.com, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Takashi Iwai <tiwai@...e.de>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Guennadi Liakhovetski <guennadi.liakhovetski@...ux.intel.com>,
        Bard Liao <bard.liao@...el.com>
Subject: Re: sound/soc/sof/intel/hda-dai.c:265:22: warning: Value stored to
 'sdev' during its initialization is never read [clang-analyzer-deadcode.DeadStores]

On Tue, Aug 24, 2021 at 9:53 AM Pierre-Louis Bossart
<pierre-louis.bossart@...ux.intel.com> wrote:
>
> Thanks for the report, I am not sure it's a real issue?
> >>> sound/soc/sof/intel/hda-dai.c:265:22: warning: Value stored to 'sdev' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
> >            struct snd_sof_dev *sdev =
> >                                ^~~~
> >    sound/soc/sof/intel/hda-dai.c:265:22: note: Value stored to 'sdev' during its initialization is never read
> >            struct snd_sof_dev *sdev =
> >                                ^~~~
> > fdd961e37e47f2 Keyon Jie         2019-04-12  259
> > fdd961e37e47f2 Keyon Jie         2019-04-12  260  static int hda_link_pcm_prepare(struct snd_pcm_substream *substream,
> > fdd961e37e47f2 Keyon Jie         2019-04-12  261                              struct snd_soc_dai *dai)
> > fdd961e37e47f2 Keyon Jie         2019-04-12  262  {
> > ed3baacd76baa0 Ranjani Sridharan 2019-04-30  263      struct hdac_ext_stream *link_dev =
> > ed3baacd76baa0 Ranjani Sridharan 2019-04-30  264                              snd_soc_dai_get_dma_data(dai, substream);
> > fdd961e37e47f2 Keyon Jie         2019-04-12 @265      struct snd_sof_dev *sdev =
> > fdd961e37e47f2 Keyon Jie         2019-04-12  266                              snd_soc_component_get_drvdata(dai->component);
> > 1205300af9dba3 Kuninori Morimoto 2020-07-20  267      struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
> > fdd961e37e47f2 Keyon Jie         2019-04-12  268      int stream = substream->stream;
> > fdd961e37e47f2 Keyon Jie         2019-04-12  269
> > a3ebccb52efdfb Kai Vehmanen      2019-07-22  270      if (link_dev->link_prepared)
> > fdd961e37e47f2 Keyon Jie         2019-04-12  271              return 0;
> > fdd961e37e47f2 Keyon Jie         2019-04-12  272
> > ed3baacd76baa0 Ranjani Sridharan 2019-04-30  273      dev_dbg(sdev->dev, "hda: prepare stream dir %d\n", substream->stream);
> > fdd961e37e47f2 Keyon Jie         2019-04-12  274
> > fdd961e37e47f2 Keyon Jie         2019-04-12  275      return hda_link_hw_params(substream, &rtd->dpcm[stream].hw_params,
> > fdd961e37e47f2 Keyon Jie         2019-04-12  276                                dai);
> > fdd961e37e47f2 Keyon Jie         2019-04-12  277  }
> > fdd961e37e47f2 Keyon Jie         2019-04-12  278
>
> The sdev variable is used in the dev_dbg() log, this looks legit to me?

Perhaps that depends on a config that was not set? The log does say
this is a randconfig build.

-- 
Thanks,
~Nick Desaulniers