[PATCH] block: fix ioctl return error with GENHD_FL_NO_PART

[Li Wang <li.wang@windriver.com>]

GENHD_FL_NO_PART means no device(-ENXIO), not parameter error(-EINVAL).

test case with parted command:
@dd if=/dev/zero of=./blk-file bs=1M count=200
@losetup /dev/loop0 ./blk-file
@parted -s /dev/loop0 mklabel MSDOS
Error: Partition(s) 1, ..., 64 on /dev/loop0 have been written,
but we have been unable to inform the kernel of the change,
probably because it/they are in use. As a result,
the old partition(s) will remain in use. You should reboot now
before making further changes.
@echo $?
1

Fixes: 1a721de8489f ("block: don't add or resize partition on the disk with GENHD_FL_NO_PART")
Signed-off-by: Li Wang <li.wang@windriver.com>
---
 block/ioctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/ioctl.c b/block/ioctl.c
index d5f5cd61efd7..701c64cd67e8 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -21,7 +21,7 @@ static int blkpg_do_ioctl(struct block_device *bdev,
 	long long start, length;
 
 	if (disk->flags & GENHD_FL_NO_PART)
-		return -EINVAL;
+		return -ENXIO;
 	if (!capable(CAP_SYS_ADMIN))
 		return -EACCES;
 	if (copy_from_user(&p, upart, sizeof(struct blkpg_partition)))
-- 
2.25.1