4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Gerald Schaefer <gerald.schae...@de.ibm.com>
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.schae...@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidef...@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/s390/block/dcssblk.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -892,7 +892,7 @@ dcssblk_direct_access (struct block_devi
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);
