Re: [PATCH 15/22] iio: accel: adxl345: reset the FIFO on error

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

Hi Lothar,

kernel test robot noticed the following build warnings:

[auto build test WARNING on jic23-iio/togreg]
[also build test WARNING on linus/master v6.12-rc7 next-20241115]
[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/Lothar-Rubusch/iio-accel-adxl345-fix-comment-on-probe/20241115-190245
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg
patch link:    https://lore.kernel.org/r/20241114231002.98595-16-l.rubusch%40gmail.com
patch subject: [PATCH 15/22] iio: accel: adxl345: reset the FIFO on error
config: arc-randconfig-r052-20241117 (https://download.01.org/0day-ci/archive/20241117/202411170855.sbBnXXo4-lkp@intel.com/config)
compiler: arc-elf-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241117/202411170855.sbBnXXo4-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/202411170855.sbBnXXo4-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/iio/accel/adxl345_core.c:383:6: warning: no previous prototype for 'adxl345_empty_fifo' [-Wmissing-prototypes]
     383 | void adxl345_empty_fifo(struct adxl34x_state *st)
         |      ^~~~~~~~~~~~~~~~~~


vim +/adxl345_empty_fifo +383 drivers/iio/accel/adxl345_core.c

   376	
   377	/**
   378	 * Empty the fifo. This is needed also in case of overflow or error handling.
   379	 * Read out all remaining elements and reset the fifo_entries counter.
   380	 *
   381	 * @st: The instance to the state object of the sensor.
   382	 */
 > 383	void adxl345_empty_fifo(struct adxl34x_state *st)
   384	{
   385		int regval;
   386		int fifo_entries;
   387	
   388		/* In case the HW is not "clean" just read out remaining elements */
   389		adxl345_get_fifo_entries(st, &fifo_entries);
   390		if (fifo_entries > 0)
   391			adxl345_read_fifo_elements(st, fifo_entries);
   392	
   393		/* Reset the INT_SOURCE register by reading the register */
   394		regmap_read(st->regmap, ADXL345_REG_INT_SOURCE, &regval);
   395	}
   396	

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