Hi Seven, url: https://github.com/0day-ci/linux/commits/Seven-Lee/ASoC-nau8821-Add-drive... base: https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next config: openrisc-randconfig-m031-20210824 (attached as .config) compiler: or1k-linux-gcc (GCC) 11.2.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Reported-by: Dan Carpenter <dan.carpenter(a)oracle.com&gt; smatch warnings: sound/soc/codecs/nau8821.c:456 dmic_clock_control() error: uninitialized symbol 'speed_selection'. vim +/speed_selection +456 sound/soc/codecs/nau8821.c 429cd8c43255317 Seven Lee 2021-08-24 419 static const struct snd_kcontrol_new nau8821_adc_ch0_dmic = 429cd8c43255317 Seven Lee 2021-08-24 420 SOC_DAPM_SINGLE("Switch", NAU8821_R13_DMIC_CTRL, 429cd8c43255317 Seven Lee 2021-08-24 421 NAU8821_DMIC_EN_SFT, 1, 0); 429cd8c43255317 Seven Lee 2021-08-24 422 429cd8c43255317 Seven Lee 2021-08-24 423 static int dmic_clock_control(struct snd_soc_dapm_widget *w, 429cd8c43255317 Seven Lee 2021-08-24 424 struct snd_kcontrol *k, int event) 429cd8c43255317 Seven Lee 2021-08-24 425 { 429cd8c43255317 Seven Lee 2021-08-24 426 struct snd_soc_component *component = 429cd8c43255317 Seven Lee 2021-08-24 427 snd_soc_dapm_to_component(w->dapm); 429cd8c43255317 Seven Lee 2021-08-24 428 struct nau8821 *nau8821 = snd_soc_component_get_drvdata(component); 429cd8c43255317 Seven Lee 2021-08-24 429 int i, speed_selection, clk_adc_src, clk_adc; 429cd8c43255317 Seven Lee 2021-08-24 430 unsigned int clk_divider_r03; 429cd8c43255317 Seven Lee 2021-08-24 431 429cd8c43255317 Seven Lee 2021-08-24 432 /* The DMIC clock is gotten from adc clock divided by 429cd8c43255317 Seven Lee 2021-08-24 433 * CLK_DMIC_SRC (1, 2, 4, 8). The clock has to be equal or 429cd8c43255317 Seven Lee 2021-08-24 434 * less than nau8821->dmic_clk_threshold. 429cd8c43255317 Seven Lee 2021-08-24 435 */ 429cd8c43255317 Seven Lee 2021-08-24 436 regmap_read(nau8821->regmap, NAU8821_R03_CLK_DIVIDER, 429cd8c43255317 Seven Lee 2021-08-24 437 &clk_divider_r03); 429cd8c43255317 Seven Lee 2021-08-24 438 clk_adc_src = (clk_divider_r03 & NAU8821_CLK_ADC_SRC_MASK) 429cd8c43255317 Seven Lee 2021-08-24 439 >> NAU8821_CLK_ADC_SRC_SFT; 429cd8c43255317 Seven Lee 2021-08-24 440 clk_adc = (nau8821->fs * 256) >> clk_adc_src; 429cd8c43255317 Seven Lee 2021-08-24 441 429cd8c43255317 Seven Lee 2021-08-24 442 for (i = 0 ; i < 4 ; i++) { 429cd8c43255317 Seven Lee 2021-08-24 443 if ((clk_adc >> dmic_speed_sel[i].param) <= 429cd8c43255317 Seven Lee 2021-08-24 444 nau8821->dmic_clk_threshold) { 429cd8c43255317 Seven Lee 2021-08-24 445 speed_selection = dmic_speed_sel[i].val; 429cd8c43255317 Seven Lee 2021-08-24 446 break; 429cd8c43255317 Seven Lee 2021-08-24 447 } 429cd8c43255317 Seven Lee 2021-08-24 448 } speed_selection is not initialized if it exits the loop with i == 4. 429cd8c43255317 Seven Lee 2021-08-24 449 429cd8c43255317 Seven Lee 2021-08-24 450 dev_dbg(nau8821->dev, 429cd8c43255317 Seven Lee 2021-08-24 451 "clk_adc=%d, dmic_clk_threshold = %d, param=%d, val = %d\n", 429cd8c43255317 Seven Lee 2021-08-24 452 clk_adc, nau8821->dmic_clk_threshold, 429cd8c43255317 Seven Lee 2021-08-24 453 dmic_speed_sel[i].param, dmic_speed_sel[i].val); 429cd8c43255317 Seven Lee 2021-08-24 454 regmap_update_bits(nau8821->regmap, NAU8821_R13_DMIC_CTRL, 429cd8c43255317 Seven Lee 2021-08-24 455 NAU8821_DMIC_SRC_MASK, 429cd8c43255317 Seven Lee 2021-08-24 @456 (speed_selection << NAU8821_DMIC_SRC_SFT)); 429cd8c43255317 Seven Lee 2021-08-24 457 429cd8c43255317 Seven Lee 2021-08-24 458 return 0; 429cd8c43255317 Seven Lee 2021-08-24 459 } --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org