Re: [PATCH v8 1/4] iio: pressure: bmp280: Use sleep and forced mode for oneshot captures

[kernel test robot <lkp@xxxxxxxxx>]

Hi Vasileios,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 96be67caa0f0420d4128cb67f07bbd7a6f49e03a]

url:    https://github.com/intel-lab-lkp/linux/commits/Vasileios-Amoiridis/iio-pressure-bmp280-Use-sleep-and-forced-mode-for-oneshot-captures/20241008-035238
base:   96be67caa0f0420d4128cb67f07bbd7a6f49e03a
patch link:    https://lore.kernel.org/r/20241007194945.66192-2-vassilisamir%40gmail.com
patch subject: [PATCH v8 1/4] iio: pressure: bmp280: Use sleep and forced mode for oneshot captures
config: i386-randconfig-006-20241011 (https://download.01.org/0day-ci/archive/20241011/202410111221.YIeXHxOv-lkp@xxxxxxxxx/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241011/202410111221.YIeXHxOv-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410111221.YIeXHxOv-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> drivers/iio/pressure/bmp280-core.c:1051:3: warning: variable 'meas_time_us' is uninitialized when used here [-Wuninitialized]
    1051 |                 meas_time_us += BMP280_PRESS_HUMID_MEAS_OFFSET +
         |                 ^~~~~~~~~~~~
   drivers/iio/pressure/bmp280-core.c:1046:32: note: initialize the variable 'meas_time_us' to silence this warning
    1046 |         unsigned int reg, meas_time_us;
         |                                       ^
         |                                        = 0
   drivers/iio/pressure/bmp280-core.c:2452:2: warning: variable 'offset' is uninitialized when used here [-Wuninitialized]
    2452 |         offset += sizeof(s32);
         |         ^~~~~~
   drivers/iio/pressure/bmp280-core.c:2437:17: note: initialize the variable 'offset' to silence this warning
    2437 |         int ret, offset;
         |                        ^
         |                         = 0
   2 warnings generated.


vim +/meas_time_us +1051 drivers/iio/pressure/bmp280-core.c

  1043	
  1044	static int bmp280_wait_conv(struct bmp280_data *data)
  1045	{
  1046		unsigned int reg, meas_time_us;
  1047		int ret;
  1048	
  1049		/* Check if we are using a BME280 device */
  1050		if (data->oversampling_humid)
> 1051			meas_time_us += BMP280_PRESS_HUMID_MEAS_OFFSET +
  1052					BIT(data->oversampling_humid) * BMP280_MEAS_DUR;
  1053	
  1054		/* Pressure measurement time */
  1055		meas_time_us += BMP280_PRESS_HUMID_MEAS_OFFSET +
  1056				BIT(data->oversampling_press) * BMP280_MEAS_DUR;
  1057	
  1058		/* Temperature measurement time */
  1059		meas_time_us += BIT(data->oversampling_temp) * BMP280_MEAS_DUR;
  1060	
  1061		/* Waiting time according to the BM(P/E)2 Sensor API */
  1062		fsleep(meas_time_us);
  1063	
  1064		ret = regmap_read(data->regmap, BMP280_REG_STATUS, &reg);
  1065		if (ret) {
  1066			dev_err(data->dev, "failed to read status register.\n");
  1067			return ret;
  1068		}
  1069	
  1070		if (reg & BMP280_REG_STATUS_MEAS_BIT) {
  1071			dev_err(data->dev, "Measurement cycle didn't complete.\n");
  1072			return -EBUSY;
  1073		}
  1074	
  1075		return 0;
  1076	}
  1077	

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