drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c:1438:58: warning: '%s' directive output may be truncated writing up to 1 bytes into a region of size between 0 and 29

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   dd72f9c7e512da377074d47d990564959b772643
commit: cc42e76e7de5190a7da5dac9d7b2bbb458e050bf drm/amd: Load MES microcode during early_init
date:   9 months ago
config: x86_64-randconfig-r006-20230904 (https://download.01.org/0day-ci/archive/20231019/202310191030.lSSsOQCJ-lkp@xxxxxxxxx/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231019/202310191030.lSSsOQCJ-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202310191030.lSSsOQCJ-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

   drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c: In function 'amdgpu_mes_ctx_alloc_meta_data':
   drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c:1099:13: warning: variable 'r' set but not used [-Wunused-but-set-variable]
    1099 |         int r;
         |             ^
   drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c: In function 'amdgpu_mes_init_microcode':
>> drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c:1438:58: warning: '%s' directive output may be truncated writing up to 1 bytes into a region of size between 0 and 29 [-Wformat-truncation=]
    1438 |         snprintf(fw_name, sizeof(fw_name), "amdgpu/%s_mes%s.bin",
         |                                                          ^~
   drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c:1438:9: note: 'snprintf' output between 16 and 46 bytes into a destination of size 40
    1438 |         snprintf(fw_name, sizeof(fw_name), "amdgpu/%s_mes%s.bin",
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    1439 |                 ucode_prefix,
         |                 ~~~~~~~~~~~~~
    1440 |                 pipe == AMDGPU_MES_SCHED_PIPE ? "" : "1");
         |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +1438 drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c

  1428	
  1429	int amdgpu_mes_init_microcode(struct amdgpu_device *adev, int pipe)
  1430	{
  1431		const struct mes_firmware_header_v1_0 *mes_hdr;
  1432		struct amdgpu_firmware_info *info;
  1433		char ucode_prefix[30];
  1434		char fw_name[40];
  1435		int r;
  1436	
  1437		amdgpu_ucode_ip_version_decode(adev, GC_HWIP, ucode_prefix, sizeof(ucode_prefix));
> 1438		snprintf(fw_name, sizeof(fw_name), "amdgpu/%s_mes%s.bin",

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