[jic23-iio:sparse-friendly-direct-mode 52/166] drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c:1850:7: warning: variable 'err' is used uninitialized whenever 'if' condition is false

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git sparse-friendly-direct-mode
head:   bada9cd0235b288b74ee2bd65fd4223d71f62b02
commit: 3e53e337047467484ef3689555b5fe392679790b [52/166] iio: imu: st_lsm6dsx: Switch to sparse friendly claim/release_direct()
config: hexagon-randconfig-002-20250203 (https://download.01.org/0day-ci/archive/20250203/202502030800.FBFCF1CE-lkp@intel.com/config)
compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project 355d0b186f178668b103068537e517f3d52ad639)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250203/202502030800.FBFCF1CE-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/202502030800.FBFCF1CE-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c:1850:7: warning: variable 'err' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
    1850 |                 if (val < 0)
         |                     ^~~~~~~
   drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c:1863:9: note: uninitialized use occurs here
    1863 |         return err;
         |                ^~~
   drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c:1850:3: note: remove the 'if' if its condition is always true
    1850 |                 if (val < 0)
         |                 ^~~~~~~~~~~~
    1851 |                         err = val;
         |                                  ~
    1852 |                 else
         |                 ~~~~
    1853 |                         sensor->odr = val;
         |                         ~~~~~~~~~~~~~~~~~
   drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c:1836:9: note: initialize the variable 'err' to silence this warning
    1836 |         int err;
         |                ^
         |                 = 0
   1 warning generated.


vim +1850 drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c

290a6ce11d938b Lorenzo Bianconi 2017-01-10  1830  
290a6ce11d938b Lorenzo Bianconi 2017-01-10  1831  static int st_lsm6dsx_write_raw(struct iio_dev *iio_dev,
290a6ce11d938b Lorenzo Bianconi 2017-01-10  1832  				struct iio_chan_spec const *chan,
290a6ce11d938b Lorenzo Bianconi 2017-01-10  1833  				int val, int val2, long mask)
290a6ce11d938b Lorenzo Bianconi 2017-01-10  1834  {
290a6ce11d938b Lorenzo Bianconi 2017-01-10  1835  	struct st_lsm6dsx_sensor *sensor = iio_priv(iio_dev);
290a6ce11d938b Lorenzo Bianconi 2017-01-10  1836  	int err;
290a6ce11d938b Lorenzo Bianconi 2017-01-10  1837  
3e53e337047467 Jonathan Cameron 2025-01-05  1838  	if (!iio_device_claim_direct(iio_dev))
3e53e337047467 Jonathan Cameron 2025-01-05  1839  		return -EBUSY;
290a6ce11d938b Lorenzo Bianconi 2017-01-10  1840  
290a6ce11d938b Lorenzo Bianconi 2017-01-10  1841  	switch (mask) {
290a6ce11d938b Lorenzo Bianconi 2017-01-10  1842  	case IIO_CHAN_INFO_SCALE:
290a6ce11d938b Lorenzo Bianconi 2017-01-10  1843  		err = st_lsm6dsx_set_full_scale(sensor, val2);
290a6ce11d938b Lorenzo Bianconi 2017-01-10  1844  		break;
2ccc15036d812e Lorenzo Bianconi 2017-04-02  1845  	case IIO_CHAN_INFO_SAMP_FREQ: {
2ccc15036d812e Lorenzo Bianconi 2017-04-02  1846  		u8 data;
2ccc15036d812e Lorenzo Bianconi 2017-04-02  1847  
f8710f0357bc36 Lorenzo Bianconi 2019-11-03  1848  		val = val * 1000 + val2 / 1000;
fc3f6ad7f5dc6c Lorenzo Bianconi 2019-10-27  1849  		val = st_lsm6dsx_check_odr(sensor, val, &data);
fc3f6ad7f5dc6c Lorenzo Bianconi 2019-10-27 @1850  		if (val < 0)
fc3f6ad7f5dc6c Lorenzo Bianconi 2019-10-27  1851  			err = val;
fc3f6ad7f5dc6c Lorenzo Bianconi 2019-10-27  1852  		else
5e3c3e3382e87a Lorenzo Bianconi 2017-09-18  1853  			sensor->odr = val;
290a6ce11d938b Lorenzo Bianconi 2017-01-10  1854  		break;
2ccc15036d812e Lorenzo Bianconi 2017-04-02  1855  	}
290a6ce11d938b Lorenzo Bianconi 2017-01-10  1856  	default:
290a6ce11d938b Lorenzo Bianconi 2017-01-10  1857  		err = -EINVAL;
290a6ce11d938b Lorenzo Bianconi 2017-01-10  1858  		break;
290a6ce11d938b Lorenzo Bianconi 2017-01-10  1859  	}
290a6ce11d938b Lorenzo Bianconi 2017-01-10  1860  
3e53e337047467 Jonathan Cameron 2025-01-05  1861  	iio_device_release_direct(iio_dev);
290a6ce11d938b Lorenzo Bianconi 2017-01-10  1862  
290a6ce11d938b Lorenzo Bianconi 2017-01-10  1863  	return err;
290a6ce11d938b Lorenzo Bianconi 2017-01-10  1864  }
290a6ce11d938b Lorenzo Bianconi 2017-01-10  1865  

:::::: The code at line 1850 was first introduced by commit
:::::: fc3f6ad7f5dc6c899fbda0255865737bac88c2e0 iio: imu: st_lsm6dsx: fix ODR check in st_lsm6dsx_write_raw

:::::: TO: Lorenzo Bianconi <lorenzo@kernel.org>
:::::: CC: Jonathan Cameron <Jonathan.Cameron@huawei.com>

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