[alsa-devel] [asoc:topic/wm9081 1/1] sound/soc/codecs/wm9081.c:1161:7: warning: 'reg' may be used uninitialized in this function

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git topic/wm9081
head:   48c3387642967d62fc47aff4ad0e3816bf8292e3
commit: 48c3387642967d62fc47aff4ad0e3816bf8292e3 [1/1] ASoC: wm9081: replace codec to component
config: arm-allmodconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 48c3387642967d62fc47aff4ad0e3816bf8292e3
        # save the attached .config to linux build tree
        make.cross ARCH=arm 

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All warnings (new ones prefixed by >>):

   sound/soc/codecs/wm9081.c: In function 'wm9081_digital_mute':
>> sound/soc/codecs/wm9081.c:1161:7: warning: 'reg' may be used uninitialized in this function [-Wmaybe-uninitialized]
      reg |= WM9081_DAC_MUTE;

vim +/reg +1161 sound/soc/codecs/wm9081.c

86ed3669 Mark Brown        2009-05-22  1152  
86ed3669 Mark Brown        2009-05-22  1153  static int wm9081_digital_mute(struct snd_soc_dai *codec_dai, int mute)
86ed3669 Mark Brown        2009-05-22  1154  {
48c33876 Kuninori Morimoto 2018-01-29  1155  	struct snd_soc_component *component = codec_dai->component;
86ed3669 Mark Brown        2009-05-22  1156  	unsigned int reg;
86ed3669 Mark Brown        2009-05-22  1157  
48c33876 Kuninori Morimoto 2018-01-29  1158  	snd_soc_component_read32(component, WM9081_DAC_DIGITAL_2);
86ed3669 Mark Brown        2009-05-22  1159  
86ed3669 Mark Brown        2009-05-22  1160  	if (mute)
86ed3669 Mark Brown        2009-05-22 @1161  		reg |= WM9081_DAC_MUTE;
86ed3669 Mark Brown        2009-05-22  1162  	else
86ed3669 Mark Brown        2009-05-22  1163  		reg &= ~WM9081_DAC_MUTE;
86ed3669 Mark Brown        2009-05-22  1164  
48c33876 Kuninori Morimoto 2018-01-29  1165  	snd_soc_component_write(component, WM9081_DAC_DIGITAL_2, reg);
86ed3669 Mark Brown        2009-05-22  1166  
86ed3669 Mark Brown        2009-05-22  1167  	return 0;
86ed3669 Mark Brown        2009-05-22  1168  }
86ed3669 Mark Brown        2009-05-22  1169  

:::::: The code at line 1161 was first introduced by commit
:::::: 86ed3669f068b514ab85ffd548456a342b3fb8d3 ASoC: WM9081 mono DAC with integrated 2.6W class AB/D amplifier driver

:::::: TO: Mark Brown <broonie at opensource.wolfsonmicro.com>
:::::: CC: Mark Brown <broonie at opensource.wolfsonmicro.com>

---
0-DAY kernel test infrastructure                Open Source Technology Center
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