block: restore a specific error code in bdev_del_partition

[ Upstream commit 88ce2a530cc9865a894454b2e40eba5957a60e1a ]

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: 08fc1ab6d748 ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/block/partitions/core.c b/block/partitions/core.c
index 534e11285a8d4f9060450a78c40f6c95dd998d12..b45539764c994601ecbe82ec36c1a8644557f1f4 100644 (file)
--- a/block/partitions/core.c
+++ b/block/partitions/core.c
@@ -529,7 +529,7 @@ 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);