[groeck-staging:hwmon-next 45/45] drivers/hwmon/kfan.c:108:2: warning: unannotated fall-through between switch labels

[groeck-staging:hwmon-next 45/45] drivers/hwmon/kfan.c:108:2: warning: unannotated fall-through between switch labels

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon-next
head:   b35fa477e6b6784401732d6d17ca643f7f73e4c5
commit: b35fa477e6b6784401732d6d17ca643f7f73e4c5 [45/45] hwmon: Add KEBA fan controller support
config: s390-allmodconfig (https://download.01.org/0day-ci/archive/20250513/202505130827.32HeaRdb-lkp@intel.com/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/20250513/202505130827.32HeaRdb-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/202505130827.32HeaRdb-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/hwmon/kfan.c:108:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
     108 |         default:
         |         ^
   drivers/hwmon/kfan.c:108:2: note: insert 'break;' to avoid fall-through
     108 |         default:
         |         ^
         |         break; 
   drivers/hwmon/kfan.c:141:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
     141 |         default:
         |         ^
   drivers/hwmon/kfan.c:141:2: note: insert 'break;' to avoid fall-through
     141 |         default:
         |         ^
         |         break; 
   drivers/hwmon/kfan.c:169:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
     169 |         default:
         |         ^
   drivers/hwmon/kfan.c:169:2: note: insert 'break;' to avoid fall-through
     169 |         default:
         |         ^
         |         break; 
   3 warnings generated.


vim +108 drivers/hwmon/kfan.c

    94	
    95	static int kfan_write(struct device *dev, enum hwmon_sensor_types type,
    96			      u32 attr, int channel, long val)
    97	{
    98		struct kfan *kfan = dev_get_drvdata(dev);
    99	
   100		switch (type) {
   101		case hwmon_pwm:
   102			switch (attr) {
   103			case hwmon_pwm_input:
   104				return kfan_set_pwm(kfan, val);
   105			default:
   106				break;
   107			}
 > 108		default:
   109			break;
   110		}
   111	
   112		return -EOPNOTSUPP;
   113	}
   114	

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https://github.com/intel/lkp-tests/wiki