[android-common:android14-5.15 1/1] drivers/gpu/drm/amd/amdgpu/../display/dmub/src/dmub_srv.c:416:77: sparse: sparse: Using plain integer as NULL pointer

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

tree:   https://android.googlesource.com/kernel/common android14-5.15
head:   65eb5a4a2e961a9252cefa9936c221b340ba0370
commit: 595b051c83a1374b1d53ab44de1c27ac60b95979 [1/1] drm/amd/display: Change the DMCUB mailbox memory location from FB to inbox
config: i386-randconfig-061-20251212 (https://download.01.org/0day-ci/archive/20251214/202512141013.VJGKROW3-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251214/202512141013.VJGKROW3-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/202512141013.VJGKROW3-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/gpu/drm/amd/amdgpu/../display/dmub/src/dmub_srv.c:416:77: sparse: sparse: Using plain integer as NULL pointer

vim +416 drivers/gpu/drm/amd/amdgpu/../display/dmub/src/dmub_srv.c

   389	
   390	enum dmub_status dmub_srv_calc_mem_info(struct dmub_srv *dmub,
   391					       const struct dmub_srv_memory_params *params,
   392					       struct dmub_srv_fb_info *out)
   393	{
   394		uint8_t *cpu_base;
   395		uint64_t gpu_base;
   396		uint32_t i;
   397	
   398		if (!dmub->sw_init)
   399			return DMUB_STATUS_INVALID;
   400	
   401		memset(out, 0, sizeof(*out));
   402	
   403		if (params->region_info->num_regions != DMUB_NUM_WINDOWS)
   404			return DMUB_STATUS_INVALID;
   405	
   406		cpu_base = (uint8_t *)params->cpu_fb_addr;
   407		gpu_base = params->gpu_fb_addr;
   408	
   409		for (i = 0; i < DMUB_NUM_WINDOWS; ++i) {
   410			const struct dmub_region *reg =
   411				&params->region_info->regions[i];
   412	
   413			out->fb[i].cpu_addr = cpu_base + reg->base;
   414			out->fb[i].gpu_addr = gpu_base + reg->base;
   415	
 > 416			if (i == DMUB_WINDOW_4_MAILBOX && params->cpu_inbox_addr != 0) {
   417				out->fb[i].cpu_addr = (uint8_t *)params->cpu_inbox_addr + reg->base;
   418				out->fb[i].gpu_addr = params->gpu_inbox_addr + reg->base;
   419			}
   420	
   421			out->fb[i].size = reg->top - reg->base;
   422		}
   423	
   424		out->num_fb = DMUB_NUM_WINDOWS;
   425	
   426		return DMUB_STATUS_OK;
   427	}
   428	

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