[hch-misc:btrfs-bio-cleanup 19/40] fs/btrfs/raid56.c:1445:6-25: atomic_dec_and_test variation before object free at line 1447.

[hch-misc:btrfs-bio-cleanup 19/40] fs/btrfs/raid56.c:1445:6-25: atomic_dec_and_test variation before object free at line 1447.

[kernel test robot]

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CC: kbuild-all(a)lists.01.org
BCC: lkp(a)intel.com
TO: Christoph Hellwig <hch@lst.de>

tree:   git://git.infradead.org/users/hch/misc.git btrfs-bio-cleanup
head:   61d70226fe38434a85b198ea6a0ca8c0bf7637bc
commit: bcf194cbc1bd2e0f5184ee61bac818c6b039ce8d [19/40] btrfs: defer I/O completion based on the btrfs_raid_bio
:::::: branch date: 2 hours ago
:::::: commit date: 11 hours ago
config: microblaze-randconfig-c004-20220322 (https://download.01.org/0day-ci/archive/20220323/202203230147.t3TXzOyp-lkp(a)intel.com/config)
compiler: microblaze-linux-gcc (GCC) 11.2.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Julia Lawall <julia.lawall@lip6.fr>


cocci warnings: (new ones prefixed by >>)
>> fs/btrfs/raid56.c:1445:6-25: atomic_dec_and_test variation before object free at line 1447.

vim +1445 fs/btrfs/raid56.c

53b381b3abeb86 David Woodhouse   2013-01-29  1433  
bcf194cbc1bd2e Christoph Hellwig 2022-03-17  1434  static void raid56_bio_end_io(struct bio *bio)
53b381b3abeb86 David Woodhouse   2013-01-29  1435  {
53b381b3abeb86 David Woodhouse   2013-01-29  1436  	struct btrfs_raid_bio *rbio = bio->bi_private;
53b381b3abeb86 David Woodhouse   2013-01-29  1437  
4e4cbee93d5613 Christoph Hellwig 2017-06-03  1438  	if (bio->bi_status)
53b381b3abeb86 David Woodhouse   2013-01-29  1439  		fail_bio_stripe(rbio, bio);
53b381b3abeb86 David Woodhouse   2013-01-29  1440  	else
53b381b3abeb86 David Woodhouse   2013-01-29  1441  		set_bio_pages_uptodate(bio);
53b381b3abeb86 David Woodhouse   2013-01-29  1442  
53b381b3abeb86 David Woodhouse   2013-01-29  1443  	bio_put(bio);
53b381b3abeb86 David Woodhouse   2013-01-29  1444  
b89e1b012c7f81 Miao Xie          2014-10-15 @1445  	if (!atomic_dec_and_test(&rbio->stripes_pending))
53b381b3abeb86 David Woodhouse   2013-01-29  1446  		return;
bcf194cbc1bd2e Christoph Hellwig 2022-03-17 @1447  	btrfs_queue_work(rbio->bioc->fs_info->endio_raid56_workers,
bcf194cbc1bd2e Christoph Hellwig 2022-03-17  1448  			 &rbio->end_io_work);
bcf194cbc1bd2e Christoph Hellwig 2022-03-17  1449  }
53b381b3abeb86 David Woodhouse   2013-01-29  1450  

:::::: The code at line 1445 was first introduced by commit
:::::: b89e1b012c7f81123344058d5f245b844464d30c Btrfs, raid56: don't change bbio and raid_map

:::::: TO: Miao Xie <miaox@cn.fujitsu.com>
:::::: CC: Miao Xie <miaox@cn.fujitsu.com>

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