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block: fix busy device checking in blk_drop_partitions again

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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 <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Tested-by: Qian Cai <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Christoph Hellwig authored and Jens Axboe committed 2020-04-10 08:34:11 -06:00
1 parent d9a9755a83
commit cb6b771b05
1 file changed
+1 -1
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block/partitions/core.c
+1 -1
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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)