[PATCH v4 2/2] drm/tiny: add driver for Apple Touch Bars in x86 Macs

[kernel test robot]

Hi Aditya,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on v6.14-rc4 next-20250227]
[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/Aditya-Garg/drm-format-helper-Add-conversion-from-XRGB8888-to-BGR888/20250224-214352
base:   linus/master
patch link:    https://lore.kernel.org/r/844C1D39-4891-4DC2-8458-F46FA1B59FA0%40live.com
patch subject: [PATCH v4 2/2] drm/tiny: add driver for Apple Touch Bars in x86 Macs
config: loongarch-allyesconfig (https://download.01.org/0day-ci/archive/20250228/202502280748.oNKTNuMK-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250228/202502280748.oNKTNuMK-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/202502280748.oNKTNuMK-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/gpu/drm/tiny/appletbdrm.c: In function 'appletbdrm_primary_plane_duplicate_state':
>> drivers/gpu/drm/tiny/appletbdrm.c:524:40: warning: variable 'old_appletbdrm_state' set but not used [-Wunused-but-set-variable]
     524 |         struct appletbdrm_plane_state *old_appletbdrm_state;
         |                                        ^~~~~~~~~~~~~~~~~~~~


vim +/old_appletbdrm_state +524 drivers/gpu/drm/tiny/appletbdrm.c

   520	
   521	static struct drm_plane_state *appletbdrm_primary_plane_duplicate_state(struct drm_plane *plane)
   522	{
   523		struct drm_shadow_plane_state *new_shadow_plane_state;
 > 524		struct appletbdrm_plane_state *old_appletbdrm_state;
   525		struct appletbdrm_plane_state *appletbdrm_state;
   526	
   527		if (WARN_ON(!plane->state))
   528			return NULL;
   529	
   530		old_appletbdrm_state = to_appletbdrm_plane_state(plane->state);
   531		appletbdrm_state = kzalloc(sizeof(*appletbdrm_state), GFP_KERNEL);
   532		if (!appletbdrm_state)
   533			return NULL;
   534	
   535		/* Request and response are not duplicated and are allocated in .atomic_check */
   536		appletbdrm_state->request = NULL;
   537		appletbdrm_state->response = NULL;
   538	
   539		appletbdrm_state->request_size = 0;
   540		appletbdrm_state->frames_size = 0;
   541	
   542		new_shadow_plane_state = &appletbdrm_state->base;
   543	
   544		__drm_gem_duplicate_shadow_plane_state(plane, new_shadow_plane_state);
   545	
   546		return &new_shadow_plane_state->base;
   547	}
   548	

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