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s390/dcssblk: fix device size calculation in dcssblk_direct_access()

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Since commit dd22f551 "block: Change direct_access calling convention",
the device size calculation in dcssblk_direct_access() is off-by-one.
This results in bdev_direct_access() always returning -ENXIO because the
returned value is not page aligned.

Fix this by adding 1 to the dev_sz calculation.

Fixes: dd22f551 ("block: Change direct_access calling convention")
Cc: <stable@vger.kernel.org> # 4.0+
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Gerald Schaefer 2017-01-30 15:52:14 +01:00 committed by Martin Schwidefsky
parent ba21d0ea21
commit a63f53e34d
1 changed files with 1 additions and 1 deletions
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2
drivers/s390/block/dcssblk.c
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@ -892,7 +892,7 @@ dcssblk_direct_access (struct block_device *bdev, sector_t secnum,
dev_info = bdev->bd_disk->private_data;
if (!dev_info)
return -ENODEV;
dev_sz = dev_info->end - dev_info->start;
dev_sz = dev_info->end - dev_info->start + 1;
offset = secnum * 512;
*kaddr = (void *) dev_info->start + offset;
*pfn = __pfn_to_pfn_t(PFN_DOWN(dev_info->start + offset), PFN_DEV);