fs/btrfs/tree-log.c:3401 log_one_extent() error: double unlock 'irq:'

Hi Josef,

FYI, there are new smatch warnings show up in

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/josef/btrfs-next.git master
head:   39a6066ac26f336b444c666a4b7339078ebf19b1
commit: 2d6d440d12fe9999503bc909f9f9e1fe8771d84f [105/117] Btrfs: wait on ordered extents at the last possible moment

fs/btrfs/tree-log.c:3401 log_one_extent() error: double unlock 'spin_lock:&log->log_extents_lock[index]'
+ fs/btrfs/tree-log.c:3401 log_one_extent() error: double unlock 'irq:'

git remote add josef-btrfs git://git.kernel.org/pub/scm/linux/kernel/git/josef/btrfs-next.git
git remote update josef-btrfs
git checkout 2d6d440d12fe9999503bc909f9f9e1fe8771d84f
vim +3401 fs/btrfs/tree-log.c

2d6d440d Josef Bacik 2012-10-12  3385  			    mod_start + mod_len)
2d6d440d Josef Bacik 2012-10-12  3386  				mod_len = 0;
2d6d440d Josef Bacik 2012-10-12  3387  		} else {
2d6d440d Josef Bacik 2012-10-12  3388  			if (ordered->file_offset + ordered->len <
2d6d440d Josef Bacik 2012-10-12  3389  			    mod_start + mod_len) {
2d6d440d Josef Bacik 2012-10-12  3390  				mod_len = (mod_start + mod_len) -
2d6d440d Josef Bacik 2012-10-12  3391  					(ordered->file_offset + ordered->len);
2d6d440d Josef Bacik 2012-10-12  3392  				mod_start = ordered->file_offset +
2d6d440d Josef Bacik 2012-10-12  3393  					ordered->len;
2d6d440d Josef Bacik 2012-10-12  3394  			} else {
2d6d440d Josef Bacik 2012-10-12  3395  				mod_len = 0;
2d6d440d Josef Bacik 2012-10-12  3396  			}
2d6d440d Josef Bacik 2012-10-12  3397  		}
2d6d440d Josef Bacik 2012-10-12  3398  
2d6d440d Josef Bacik 2012-10-12  3399  		spin_lock_irq(&log->log_extents_lock[index]);
2d6d440d Josef Bacik 2012-10-12  3400  	}
2d6d440d Josef Bacik 2012-10-12 @3401  	spin_unlock_irq(&log->log_extents_lock[index]);
2d6d440d Josef Bacik 2012-10-12  3402  
2d6d440d Josef Bacik 2012-10-12  3403  	if (!mod_len || ret)
2d6d440d Josef Bacik 2012-10-12  3404  		return ret;
2d6d440d Josef Bacik 2012-10-12  3405  
2d6d440d Josef Bacik 2012-10-12  3406  	csum_offset = mod_start - em->start;
2d6d440d Josef Bacik 2012-10-12  3407  	csum_len = mod_len;
2d6d440d Josef Bacik 2012-10-12  3408  
8a868ae3 Josef Bacik 2012-10-11  3409  	/* block start is already adjusted for the file extent offset. */

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Fengguang Wu, Yuanhan Liu Intel Corporation