Hi Qu,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on kdave/for-next]
[also build test WARNING on linus/master v6.2-rc1 next-20221226]
[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/Qu-Wenruo/btrfs-scrub-rework-to-get-rid-of-the-complex-bio-formshaping/20221206-162558
base:   https://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux.git for-next
patch link:    https://lore.kernel.org/r/9a9101481ba88a952e50963030599d8e987be006.1670314744.git.wqu%40suse.com
patch subject: [PoC PATCH 07/11] btrfs: scrub: add raid56 P/Q scrubbing support
config: sparc-randconfig-s052-20221225
compiler: sparc-linux-gcc (GCC) 12.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://github.com/intel-lab-lkp/linux/commit/6ed702c71dccdb9f21889e9dbd9a6c41a84dc3c3
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Qu-Wenruo/btrfs-scrub-rework-to-get-rid-of-the-complex-bio-formshaping/20221206-162558
        git checkout 6ed702c71dccdb9f21889e9dbd9a6c41a84dc3c3
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=sparc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=sparc SHELL=/bin/bash fs/btrfs/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

sparse warnings: (new ones prefixed by >>)
>> fs/btrfs/scrub.c:4279:51: sparse: sparse: Using plain integer as NULL pointer

vim +4279 fs/btrfs/scrub.c

  4265	
  4266	static void scrub2_release_full_stripe(struct btrfs_fs_info *fs_info,
  4267					struct scrub2_stripe_group *full_stripe)
  4268	{
  4269		int i;
  4270	
  4271		btrfs_put_bioc(full_stripe->bioc);
  4272		btrfs_bio_counter_dec(fs_info);
  4273		ASSERT(atomic_read(&full_stripe->pending_stripes) == 0);
  4274		if (full_stripe->nr_stripes) {
  4275			for (i = 0; i < full_stripe->nr_stripes; i++) {
  4276				if (!full_stripe->stripes[i])
  4277					continue;
  4278				free_scrub2_stripe(full_stripe->stripes[i]);
> 4279				full_stripe->stripes[i] = 0;
  4280			}
  4281			kfree(full_stripe->stripes);
  4282			full_stripe->stripes = NULL;
  4283		}
  4284	}
  4285	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp