iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

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

Browse Source 
commit a63f53e34db8b49675448d03ae324f6c5bc04fe6 upstream.

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")
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gerald Schaefer 2017-01-30 15:52:14 +01:00 committed by Greg Kroah-Hartman
parent ec50c80c78
commit 792bd1fb5b
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/s390/block/dcssblk.c
View File

@ -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;
addr = (void *) (dev_info->start + offset);
*pfn = virt_to_phys(addr) >> PAGE_SHIFT;