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block: fix busy device checking in blk_drop_partitions again 

The previous fix had an off by one in the bd_openers checking, counting
the callers blkdev_get.

Fixes: d3ef553627 ("block: fix busy device checking in blk_drop_partitions")
Reported-by: Qian Cai <cai@lca.pw>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Qian Cai <cai@lca.pw>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-04-10 14:31:47 +02:00 committed by Jens Axboe
parent d9a9755a83
commit cb6b771b05
1 changed files with 1 additions and 1 deletions
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block/partitions/core.c
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@ -496,7 +496,7 @@ int blk_drop_partitions(struct gendisk *disk, struct block_device *bdev)
if (!disk_part_scan_enabled(disk))
return 0;
if (bdev->bd_part_count || bdev->bd_openers)
if (bdev->bd_part_count || bdev->bd_openers > 1)
return -EBUSY;
res = invalidate_partition(disk, 0);
if (res)