[android-common:android13-5.15-2024-11 1/1] drivers/dma-buf/st-dma-fence-unwrap.c:125:13: warning: variable 'err' set but not used

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

Hi Christian,

FYI, the error/warning still remains.

tree:   https://android.googlesource.com/kernel/common android13-5.15-2024-11
head:   bfd2ab010d7b36dd753731915553c4f37b98c6f6
commit: 169630111a051b0f07c69a71ca25895e0f4df83e [1/1] BACKPORT: dma-buf: add dma_fence_unwrap v2
config: arm-allyesconfig (https://download.01.org/0day-ci/archive/20260503/202605030934.HRBHsThu-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260503/202605030934.HRBHsThu-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/202605030934.HRBHsThu-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/dma-buf/st-dma-fence-unwrap.c: In function 'unwrap_array':
>> drivers/dma-buf/st-dma-fence-unwrap.c:125:13: warning: variable 'err' set but not used [-Wunused-but-set-variable]
     125 |         int err = 0;
         |             ^~~
   drivers/dma-buf/st-dma-fence-unwrap.c: In function 'unwrap_chain':
   drivers/dma-buf/st-dma-fence-unwrap.c:167:13: warning: variable 'err' set but not used [-Wunused-but-set-variable]
     167 |         int err = 0;
         |             ^~~
   drivers/dma-buf/st-dma-fence-unwrap.c: In function 'unwrap_chain_array':
   drivers/dma-buf/st-dma-fence-unwrap.c:209:13: warning: variable 'err' set but not used [-Wunused-but-set-variable]
     209 |         int err = 0;
         |             ^~~


vim +/err +125 drivers/dma-buf/st-dma-fence-unwrap.c

   120	
   121	static int unwrap_array(void *arg)
   122	{
   123		struct dma_fence *fence, *f1, *f2, *array;
   124		struct dma_fence_unwrap iter;
 > 125		int err = 0;
   126	
   127		f1 = mock_fence();
   128		if (!f1)
   129			return -ENOMEM;
   130	
   131		f2 = mock_fence();
   132		if (!f2) {
   133			dma_fence_put(f1);
   134			return -ENOMEM;
   135		}
   136	
   137		array = mock_array(2, f1, f2);
   138		if (!array)
   139			return -ENOMEM;
   140	
   141		dma_fence_unwrap_for_each(fence, &iter, array) {
   142			if (fence == f1) {
   143				f1 = NULL;
   144			} else if (fence == f2) {
   145				f2 = NULL;
   146			} else {
   147				pr_err("Unexpected fence!\n");
   148				err = -EINVAL;
   149			}
   150		}
   151	
   152		if (f1 || f2) {
   153			pr_err("Not all fences seen!\n");
   154			err = -EINVAL;
   155		}
   156	
   157		dma_fence_signal(f1);
   158		dma_fence_signal(f2);
   159		dma_fence_put(array);
   160		return 0;
   161	}
   162	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki