[PATCH 8/8] counter: stm32-timer-cnt: add support for events

[kernel test robot]

Hi Fabrice,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on v6.5 next-20230830]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Fabrice-Gasnier/counter-chrdev-fix-getting-array-extensions/20230829-230111
base:   linus/master
patch link:    https://lore.kernel.org/r/20230829134029.2402868-9-fabrice.gasnier%40foss.st.com
patch subject: [PATCH 8/8] counter: stm32-timer-cnt: add support for events
config: arm-randconfig-001-20230830 (https://download.01.org/0day-ci/archive/20230830/202308301541.ZqWpJdto-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230830/202308301541.ZqWpJdto-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308301541.ZqWpJdto-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/counter/stm32-timer-cnt.c:528:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
     528 |         case COUNTER_EVENT_OVERFLOW_UNDERFLOW:
         |         ^
   drivers/counter/stm32-timer-cnt.c:528:2: note: insert '__attribute__((fallthrough));' to silence this warning
     528 |         case COUNTER_EVENT_OVERFLOW_UNDERFLOW:
         |         ^
         |         __attribute__((fallthrough)); 
   drivers/counter/stm32-timer-cnt.c:528:2: note: insert 'break;' to avoid fall-through
     528 |         case COUNTER_EVENT_OVERFLOW_UNDERFLOW:
         |         ^
         |         break; 
   1 warning generated.


vim +528 drivers/counter/stm32-timer-cnt.c

   516	
   517	static int stm32_count_watch_validate(struct counter_device *counter,
   518					      const struct counter_watch *watch)
   519	{
   520		struct stm32_timer_cnt *const priv = counter_priv(counter);
   521	
   522		switch (watch->event) {
   523		case COUNTER_EVENT_CAPTURE:
   524			if (watch->channel >= priv->nchannels) {
   525				dev_err(counter->parent, "Invalid channel %d\n", watch->channel);
   526				return -EINVAL;
   527			}
 > 528		case COUNTER_EVENT_OVERFLOW_UNDERFLOW:
   529			return 0;
   530		default:
   531			return -EINVAL;
   532		}
   533	}
   534	

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