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| author | Gerald Schaefer <gerald.schaefer@de.ibm.com> | 2017-01-30 15:52:14 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-02-03 13:50:17 +0100 |
| commit | a63f53e34db8b49675448d03ae324f6c5bc04fe6 (patch) | |
| tree | 0362bf723be3650de766b75ea94ed172cf9a2930 /drivers/s390 | |
| parent | ba21d0ea218983f269f957de267ca62fdbf96be3 (diff) | |
| download | lwn-a63f53e34db8b49675448d03ae324f6c5bc04fe6.tar.gz lwn-a63f53e34db8b49675448d03ae324f6c5bc04fe6.zip | |
s390/dcssblk: fix device size calculation in dcssblk_direct_access()
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>
Diffstat (limited to 'drivers/s390')
| -rw-r--r-- | drivers/s390/block/dcssblk.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c index 9d66b4fb174b..415d10a67b7a 100644 --- a/drivers/s390/block/dcssblk.c +++ b/drivers/s390/block/dcssblk.c @@ -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); |