[PATCH v3 09/20] gpu: host1x: DMA fences and userspace fence creation

[kernel test robot]

Hi Mikko,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on tegra-drm/drm/tegra/for-next]
[also build test WARNING on tegra/for-next linus/master v5.9-rc8 next-20201007]
[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]

url:    https://github.com/0day-ci/linux/commits/Mikko-Perttunen/Host1x-TegraDRM-UAPI/20201008-034403
base:   git://anongit.freedesktop.org/tegra/linux.git drm/tegra/for-next
config: arm64-randconfig-r021-20201008 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 4d1d8ae7100ec3c7e1709addb7b3ec6f9ad0b44f)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/0day-ci/linux/commit/c4f5ec983027f2b19e6854a362e23a79e1630100
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Mikko-Perttunen/Host1x-TegraDRM-UAPI/20201008-034403
        git checkout c4f5ec983027f2b19e6854a362e23a79e1630100
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>

All warnings (new ones prefixed by >>):

>> drivers/gpu/host1x/uapi.c:227:8: warning: variable 'file' is uninitialized when used here [-Wuninitialized]
                   fput(file->file);
                        ^~~~
   drivers/gpu/host1x/uapi.c:204:24: note: initialize the variable 'file' to silence this warning
           struct sync_file *file;
                                 ^
                                  = NULL
   1 warning generated.
--
>> drivers/gpu/host1x/fence.c:105:6: warning: no previous prototype for function 'host1x_fence_signal' [-Wmissing-prototypes]
   void host1x_fence_signal(struct host1x_syncpt_fence *f)
        ^
   drivers/gpu/host1x/fence.c:105:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void host1x_fence_signal(struct host1x_syncpt_fence *f)
   ^
   static 
   1 warning generated.

vim +/file +227 drivers/gpu/host1x/uapi.c

   199	
   200	static int dev_file_ioctl_create_fence(struct host1x *host1x, void __user *data)
   201	{
   202		struct host1x_create_fence args;
   203		unsigned long copy_err;
   204		struct sync_file *file;
   205		int fd;
   206	
   207		copy_err = copy_from_user(&args, data, sizeof(args));
   208		if (copy_err)
   209			return -EFAULT;
   210	
   211		if (args.reserved[0])
   212			return -EINVAL;
   213	
   214		if (args.id >= host1x_syncpt_nb_pts(host1x))
   215			return -EINVAL;
   216	
   217		args.id = array_index_nospec(args.id, host1x_syncpt_nb_pts(host1x));
   218	
   219		fd = host1x_fence_create_fd(&host1x->syncpt[args.id], args.threshold);
   220		if (fd < 0)
   221			return fd;
   222	
   223		args.fence_fd = fd;
   224	
   225		copy_err = copy_to_user(data, &args, sizeof(args));
   226		if (copy_err) {
 > 227			fput(file->file);
   228			return -EFAULT;
   229		}
   230	
   231		return 0;
   232	}
   233	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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