From a63f53e34db8b49675448d03ae324f6c5bc04fe6 Mon Sep 17 00:00:00 2001 From: Gerald Schaefer Date: Mon, 30 Jan 2017 15:52:14 +0100 Subject: [PATCH] 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: # 4.0+ Signed-off-by: Gerald Schaefer Signed-off-by: Martin Schwidefsky --- drivers/s390/block/dcssblk.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) 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); -- 2.20.1