[morimoto-linux:fw-cleanup-2020-05-18-v1 112/211] sound/soc/soc-pcm.c:631:28: warning: variable 'last' set but not used

[morimoto-linux:fw-cleanup-2020-05-18-v1 112/211] sound/soc/soc-pcm.c:631:28: warning: variable 'last' set but not used

[kbuild test robot]

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tree:   https://github.com/morimoto/linux fw-cleanup-2020-05-18-v1
head:   ab7ab9e3fba39b481f85abd88e5d2893f013650f
commit: f0b68bf29aed7f5122fcd158f1b0b3be032c422d [112/211] ASoC: soc-component: add mark for soc_pcm_components_open/close()
config: riscv-randconfig-r022-20200519 (attached as .config)
compiler: riscv64-linux-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout f0b68bf29aed7f5122fcd158f1b0b3be032c422d
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=riscv 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@intel.com>

All warnings (new ones prefixed by >>, old ones prefixed by <<):

sound/soc/soc-pcm.c: In function 'soc_pcm_components_open':
>> sound/soc/soc-pcm.c:631:28: warning: variable 'last' set but not used [-Wunused-but-set-variable]
631 |  struct snd_soc_component *last = NULL;
|                            ^~~~

vim +/last +631 sound/soc/soc-pcm.c

bd477c31ca3ae8 Lars-Peter Clausen 2013-05-14  627  
dd03907bf129b4 Kuninori Morimoto  2020-02-10  628  static int soc_pcm_components_open(struct snd_pcm_substream *substream)
e7ecfdb794fef1 Kuninori Morimoto  2019-05-13  629  {
e7ecfdb794fef1 Kuninori Morimoto  2019-05-13  630  	struct snd_soc_pcm_runtime *rtd = substream->private_data;
d2aaa8d8bfba93 Kai Vehmanen       2020-02-20 @631  	struct snd_soc_component *last = NULL;
e7ecfdb794fef1 Kuninori Morimoto  2019-05-13  632  	struct snd_soc_component *component;
613fb50059cf19 Kuninori Morimoto  2020-01-10  633  	int i, ret = 0;
e7ecfdb794fef1 Kuninori Morimoto  2019-05-13  634  
613fb50059cf19 Kuninori Morimoto  2020-01-10  635  	for_each_rtd_components(rtd, i, component) {
d2aaa8d8bfba93 Kai Vehmanen       2020-02-20  636  		last = component;
d2aaa8d8bfba93 Kai Vehmanen       2020-02-20  637  
f0b68bf29aed7f Kuninori Morimoto  2020-03-04  638  		ret = snd_soc_component_module_get_when_open(component, substream);
4a81e8f30d0b42 Kuninori Morimoto  2019-07-26  639  		if (ret < 0) {
e7ecfdb794fef1 Kuninori Morimoto  2019-05-13  640  			dev_err(component->dev,
e7ecfdb794fef1 Kuninori Morimoto  2019-05-13  641  				"ASoC: can't get module %s\n",
e7ecfdb794fef1 Kuninori Morimoto  2019-05-13  642  				component->name);
d2aaa8d8bfba93 Kai Vehmanen       2020-02-20  643  			break;
e7ecfdb794fef1 Kuninori Morimoto  2019-05-13  644  		}
e7ecfdb794fef1 Kuninori Morimoto  2019-05-13  645  
ae2f4849286eed Kuninori Morimoto  2019-07-26  646  		ret = snd_soc_component_open(component, substream);
e7ecfdb794fef1 Kuninori Morimoto  2019-05-13  647  		if (ret < 0) {
e7ecfdb794fef1 Kuninori Morimoto  2019-05-13  648  			dev_err(component->dev,
e7ecfdb794fef1 Kuninori Morimoto  2019-05-13  649  				"ASoC: can't open component %s: %d\n",
e7ecfdb794fef1 Kuninori Morimoto  2019-05-13  650  				component->name, ret);
d2aaa8d8bfba93 Kai Vehmanen       2020-02-20  651  			break;
e7ecfdb794fef1 Kuninori Morimoto  2019-05-13  652  		}
e7ecfdb794fef1 Kuninori Morimoto  2019-05-13  653  	}
dd03907bf129b4 Kuninori Morimoto  2020-02-10  654  
d2aaa8d8bfba93 Kai Vehmanen       2020-02-20  655  	return ret;
e7ecfdb794fef1 Kuninori Morimoto  2019-05-13  656  }
e7ecfdb794fef1 Kuninori Morimoto  2019-05-13  657  

:::::: The code at line 631 was first introduced by commit
:::::: d2aaa8d8bfba93237ac944ee058fb98e2c2ef983 ASoC: soc-pcm: fix state tracking error in snd_soc_component_open/close()

:::::: TO: Kai Vehmanen <kai.vehmanen@linux.intel.com>
:::::: CC: Mark Brown <broonie@kernel.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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