From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jyri Sarha <jsarha@ti.com>
Subject: Re: ASoC: davinci-mcasp: Choose PCM driver based on
 configured DMA controller
Date: Thu, 11 Jun 2015 22:05:26 +0300
Message-ID: <5579DBF6.3030104@ti.com>
References: <20150611150605.GB12192@mwanda>
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To: Dan Carpenter <dan.carpenter@oracle.com>
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On 06/11/15 18:06, Dan Carpenter wrote:
> Hello Jyri Sarha,
>
> The patch 9fbd58cf4ab0: "ASoC: davinci-mcasp: Choose PCM driver based
> on configured DMA controller" from Jun 2, 2015, leads to the
> following static checker warning:
>
> 	sound/soc/davinci/davinci-mcasp.c:1842 davinci_mcasp_probe()
> 	info: ignoring unreachable code.
>
> sound/soc/davinci/davinci-mcasp.c
>    1812          switch (ret) {
>    1813          case PCM_EDMA:
>    1814  #if IS_BUILTIN(CONFIG_SND_EDMA_SOC) || \
>    1815          (IS_MODULE(CONFIG_SND_DAVINCI_SOC_MCASP) && \
>    1816           IS_MODULE(CONFIG_SND_EDMA_SOC))
>    1817                  ret = edma_pcm_platform_register(&pdev->dev);
>    1818  #else
>    1819                  dev_err(&pdev->dev, "Missing SND_EDMA_SOC\n");
>    1820                  ret = -EINVAL;
>    1821                  goto err;
>    1822  #endif
>    1823                  break;
>    1824          case PCM_SDMA:
>    1825  #if IS_BUILTIN(CONFIG_SND_OMAP_SOC) || \
>    1826          (IS_MODULE(CONFIG_SND_DAVINCI_SOC_MCASP) && \
>    1827           IS_MODULE(CONFIG_SND_OMAP_SOC))
>    1828                  ret = omap_pcm_platform_register(&pdev->dev);
>    1829  #else
>    1830                  dev_err(&pdev->dev, "Missing SND_SDMA_SOC\n");
>    1831                  ret = -EINVAL;
>    1832                  goto err;
>    1833  #endif
>    1834                  break;
>    1835          default:
>    1836                  dev_err(&pdev->dev, "No DMA controller found (%d)\n", ret);
>    1837          case -EPROBE_DEFER:
>    1838                  goto err;
>    1839                  break;
>    1840          }
>    1841
>
> Depending on the ifdefs then this is reachable, I guess...

Yes it is. I could remove the "goto err;" from #else branches to silence 
the warning. That would cause a double error print for a single issue... 
either way is Ok by me.

Best regards,
Jyri

>
>    1842          if (ret) {
>    1843                  dev_err(&pdev->dev, "register PCM failed: %d\n", ret);
>    1844                  goto err;
>    1845          }
>    1846
>    1847          return 0;
>    1848
>    1849  err:
>    1850          pm_runtime_disable(&pdev->dev);
>    1851          return ret;
>    1852  }
>    1853
>
> regards,
> dan carpenter
>