Re: [PATCH v4 07/13] ASoC: codecs: wcd: add common helper for wcd codecs

[kernel test robot <lkp@intel.com>]

Hi Srinivas,

kernel test robot noticed the following build warnings:

[auto build test WARNING on broonie-sound/for-next]
[also build test WARNING on linus/master v6.17-rc5 next-20250905]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Srinivas-Kandagatla/ASoC-codecs-wcd937x-set-the-comp-soundwire-port-correctly/20250907-192533
base:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next
patch link:    https://lore.kernel.org/r/20250907112201.259405-8-srinivas.kandagatla%40oss.qualcomm.com
patch subject: [PATCH v4 07/13] ASoC: codecs: wcd: add common helper for wcd codecs
config: openrisc-allyesconfig (https://download.01.org/0day-ci/archive/20250908/202509081839.R4vv3FST-lkp@intel.com/config)
compiler: or1k-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250908/202509081839.R4vv3FST-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202509081839.R4vv3FST-lkp@intel.com/

All warnings (new ones prefixed by >>):

   sound/soc/codecs/wcd-common.c: In function 'wcd_dt_parse_micbias_info':
>> sound/soc/codecs/wcd-common.c:34:51: warning: 'sprintf' may write a terminating nul past the end of the destination [-Wformat-overflow=]
      34 |         sprintf(micbias, "qcom,micbias%d-microvolt", micb_num);
         |                                                   ^
   In function 'wcd_get_micbias_val',
       inlined from 'wcd_dt_parse_micbias_info' at sound/soc/codecs/wcd-common.c:61:26:
   sound/soc/codecs/wcd-common.c:34:9: note: 'sprintf' output between 24 and 33 bytes into a destination of size 32
      34 |         sprintf(micbias, "qcom,micbias%d-microvolt", micb_num);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/sprintf +34 sound/soc/codecs/wcd-common.c

    28	
    29	static int wcd_get_micbias_val(struct device *dev, int micb_num, u32 *micb_mv)
    30	{
    31		char micbias[32];
    32		int mv;
    33	
  > 34		sprintf(micbias, "qcom,micbias%d-microvolt", micb_num);
    35	
    36		if (of_property_read_u32(dev->of_node, micbias, &mv)) {
    37			dev_err(dev, "%s value not found, using default\n", micbias);
    38			mv = WCD_DEF_MICBIAS_MV;
    39		} else {
    40			/* convert it to milli volts */
    41			mv = mv/1000;
    42		}
    43		if (micb_mv)
    44			*micb_mv = mv;
    45	
    46		mv = wcd_get_micb_vout_ctl_val(dev, mv);
    47		if (mv < 0) {
    48			dev_err(dev, "Unsupported %s voltage (%d mV), falling back to default (%d mV)\n",
    49					micbias, mv, WCD_DEF_MICBIAS_MV);
    50			return wcd_get_micb_vout_ctl_val(dev, WCD_DEF_MICBIAS_MV);
    51		}
    52	
    53		return mv;
    54	}
    55	

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