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block: restore a specific error code in bdev_del_partition 

mdadm relies on the fact that deleting an invalid partition returns
-ENXIO or -ENOTTY to detect if a block device is a partition or a
whole device.

Fixes: 08fc1ab6d7 ("block: fix locking in bdev_del_partition")
Reported-by: kernel test robot <rong.a.chen@intel.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-09-08 16:15:06 +02:00 committed by Jens Axboe
parent 7e24969022
commit 88ce2a530c
1 changed files with 1 additions and 1 deletions
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2
block/partitions/core.c
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@ -537,7 +537,7 @@ int bdev_del_partition(struct block_device *bdev, int partno)
bdevp = bdget_disk(bdev->bd_disk, partno);
if (!bdevp)
return -ENOMEM;
return -ENXIO;
mutex_lock(&bdevp->bd_mutex);
mutex_lock_nested(&bdev->bd_mutex, 1);