Hi Krzysztof,

I love your patch! Perhaps something to improve:

[auto build test WARNING on groeck-staging/hwmon-next]
[also build test WARNING on next-20211012]
[cannot apply to robh/for-next v5.15-rc5]
[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]

url:    https://github.com/0day-ci/linux/commits/Krzysztof-Adamski/Add-per-channel-properies-support-in-tmp421/20211012-173142
base:   https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon-next
config: arm64-randconfig-r024-20211012 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c3dcf39554dbea780d6cb7e12239451ba47a2668)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/0day-ci/linux/commit/4a0f8262fe071b0b27c6fba7455627f3c5a5209e
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Krzysztof-Adamski/Add-per-channel-properies-support-in-tmp421/20211012-173142
        git checkout 4a0f8262fe071b0b27c6fba7455627f3c5a5209e
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <redacted>

All warnings (new ones prefixed by >>):

quoted

drivers/hwmon/tmp421.c:178:10: warning: variable 'err' is uninitialized when used here [-Wuninitialized]

                   return err;
                          ^~~
   drivers/hwmon/tmp421.c:170:9: note: initialize the variable 'err' to silence this warning
           int err;
                  ^
                   = 0
   1 warning generated.


vim +/err +178 drivers/hwmon/tmp421.c

   167	
   168	static int tmp421_enable_channels(struct tmp421_data *data)
   169	{
   170		int err;
   171		struct i2c_client *client = data->client;
   172		struct device *dev = &client->dev;
   173		int cfg = i2c_smbus_read_byte_data(client, TMP421_CONFIG_REG_2);
   174		int i;
   175	
   176		if (cfg < 0) {
   177			dev_err(dev, "error reading register, can't disable channels\n");
 > 178			return err;
   179		}
   180	
   181		cfg &= ~TMP421_CONFIG_REG_REN_MASK;
   182		for (i = 0; i < data->channels; i++)
   183			if (data->channel[i].enabled)
   184				cfg |= TMP421_CONFIG_REG_REN(i);
   185	
   186		err = i2c_smbus_write_byte_data(client, TMP421_CONFIG_REG_2, cfg);
   187		if (err < 0)
   188			dev_err(dev, "error writing register, can't disable channels\n");
   189	
   190		return err;
   191	}
   192	

---
0-DAY CI Kernel Test Service, Intel Corporation
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