Re: [RESEND v13 07/10] ASoC: qcom: Add support for codec dma driver

[Dan Carpenter]

Hi Srinivasa,

url:    https://github.com/0day-ci/linux/commits/Srinivasa-Rao-Mandadapu/Add-support-for-audio-on-SC7280-based-targets/20220214-230256
base:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next
config: m68k-randconfig-m031-20220214 (https://download.01.org/0day-ci/archive/20220215/202202151059.hEuYfkLa-lkp@xxxxxxxxx/config)
compiler: m68k-linux-gcc (GCC) 11.2.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

smatch warnings:
sound/soc/qcom/lpass-platform.c:1233 lpass_platform_copy() warn: maybe return -EFAULT instead of the bytes remaining?

vim +1233 sound/soc/qcom/lpass-platform.c

e81c7e5d842d2b Srinivasa Rao Mandadapu 2022-02-14  1210  static int lpass_platform_copy(struct snd_soc_component *component,
e81c7e5d842d2b Srinivasa Rao Mandadapu 2022-02-14  1211  			       struct snd_pcm_substream *substream, int channel,
e81c7e5d842d2b Srinivasa Rao Mandadapu 2022-02-14  1212  			       unsigned long pos, void __user *buf, unsigned long bytes)
e81c7e5d842d2b Srinivasa Rao Mandadapu 2022-02-14  1213  {
e81c7e5d842d2b Srinivasa Rao Mandadapu 2022-02-14  1214  	struct snd_pcm_runtime *rt = substream->runtime;
e81c7e5d842d2b Srinivasa Rao Mandadapu 2022-02-14  1215  	unsigned int dai_id = component->id;
e81c7e5d842d2b Srinivasa Rao Mandadapu 2022-02-14  1216  	int ret = 0;
e81c7e5d842d2b Srinivasa Rao Mandadapu 2022-02-14  1217  
e81c7e5d842d2b Srinivasa Rao Mandadapu 2022-02-14  1218  	void __iomem *dma_buf = rt->dma_area + pos +
e81c7e5d842d2b Srinivasa Rao Mandadapu 2022-02-14  1219  				channel * (rt->dma_bytes / rt->channels);
e81c7e5d842d2b Srinivasa Rao Mandadapu 2022-02-14  1220  
e81c7e5d842d2b Srinivasa Rao Mandadapu 2022-02-14  1221  	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
e81c7e5d842d2b Srinivasa Rao Mandadapu 2022-02-14  1222  		if (is_cdc_dma_port(dai_id))
e81c7e5d842d2b Srinivasa Rao Mandadapu 2022-02-14  1223  			ret = copy_from_user_toio(dma_buf, buf, bytes);
e81c7e5d842d2b Srinivasa Rao Mandadapu 2022-02-14  1224  		else
e81c7e5d842d2b Srinivasa Rao Mandadapu 2022-02-14  1225  			ret = copy_from_user((void __force *)dma_buf, buf, bytes);
                                                                                      ^^^^^^^^^^^^^^
Positives are treated as success in _soc_component_ret()

e81c7e5d842d2b Srinivasa Rao Mandadapu 2022-02-14  1226  	} else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
e81c7e5d842d2b Srinivasa Rao Mandadapu 2022-02-14  1227  		if (is_cdc_dma_port(dai_id))
e81c7e5d842d2b Srinivasa Rao Mandadapu 2022-02-14  1228  			ret = copy_to_user_fromio(buf, dma_buf, bytes);
e81c7e5d842d2b Srinivasa Rao Mandadapu 2022-02-14  1229  		else
e81c7e5d842d2b Srinivasa Rao Mandadapu 2022-02-14  1230  			ret = copy_to_user(buf, (void __force *)dma_buf, bytes);

Same

e81c7e5d842d2b Srinivasa Rao Mandadapu 2022-02-14  1231  	}
e81c7e5d842d2b Srinivasa Rao Mandadapu 2022-02-14  1232  
e81c7e5d842d2b Srinivasa Rao Mandadapu 2022-02-14 @1233  	return ret;
e81c7e5d842d2b Srinivasa Rao Mandadapu 2022-02-14  1234  }

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