Re: [PATCH v12 2/2] iio: magnetometer: Add mmc5633 sensor

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

Hi Frank,

kernel test robot noticed the following build errors:

[auto build test ERROR on 8f0b4cce4481fb22653697cced8d0d04027cb1e8]

url:    https://github.com/intel-lab-lkp/linux/commits/Frank-Li/dt-bindings-trivial-devices-add-MEMSIC-3-axis-magnetometer/20251216-010451
base:   8f0b4cce4481fb22653697cced8d0d04027cb1e8
patch link:    https://lore.kernel.org/r/20251215-i3c_ddr-v12-2-1ae31225b4d9%40nxp.com
patch subject: [PATCH v12 2/2] iio: magnetometer: Add mmc5633 sensor
config: arm64-allmodconfig (https://download.01.org/0day-ci/archive/20251220/202512202141.aAwyC19D-lkp@intel.com/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251220/202512202141.aAwyC19D-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/202512202141.aAwyC19D-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/iio/magnetometer/mmc5633.c:362:2: error: cannot jump from switch statement to this case label
     362 |         default:
         |         ^
   drivers/iio/magnetometer/mmc5633.c:357:3: note: jump bypasses initialization of variable with __attribute__((cleanup))
     357 |                 guard(mutex)(&data->mutex);
         |                 ^
   include/linux/cleanup.h:414:15: note: expanded from macro 'guard'
     414 |         CLASS(_name, __UNIQUE_ID(guard))
         |                      ^
   include/linux/compiler.h:168:2: note: expanded from macro '__UNIQUE_ID'
     168 |         __PASTE(__UNIQUE_ID_,                                   \
         |         ^
   include/linux/compiler_types.h:16:23: note: expanded from macro '__PASTE'
      16 | #define __PASTE(a, b) ___PASTE(a, b)
         |                       ^
   include/linux/compiler_types.h:15:24: note: expanded from macro '___PASTE'
      15 | #define ___PASTE(a, b) a##b
         |                        ^
   <scratch space>:9:1: note: expanded from here
       9 | __UNIQUE_ID_guard_966
         | ^
   1 error generated.


vim +362 drivers/iio/magnetometer/mmc5633.c

   343	
   344	static int mmc5633_write_raw(struct iio_dev *indio_dev,
   345				     struct iio_chan_spec const *chan, int val,
   346				     int val2, long mask)
   347	{
   348		struct mmc5633_data *data = iio_priv(indio_dev);
   349		int ret;
   350	
   351		switch (mask) {
   352		case IIO_CHAN_INFO_SAMP_FREQ:
   353			ret = mmc5633_get_samp_freq_index(data, val, val2);
   354			if (ret < 0)
   355				return ret;
   356	
   357			guard(mutex)(&data->mutex);
   358	
   359			return regmap_update_bits(data->regmap, MMC5633_REG_CTRL1,
   360						  MMC5633_CTRL1_BW_MASK,
   361						  FIELD_PREP(MMC5633_CTRL1_BW_MASK, ret));
 > 362		default:
   363			return -EINVAL;
   364		}
   365	}
   366	

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