[PATCH RFC] RAMDISK: doing write barrier will return -EIO

[Richard Zhu]

when doing write barrier, the data of the bio is NULL, it's OK for
ramdisk doing nothing, So the result of the bio must be success.

Signed-off-by: Richard Zhu <Hong-Xing.Zhu at freescale.com>
---
 drivers/block/brd.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index b7f51e4..8d4964c 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -335,12 +335,14 @@ static int brd_make_request(struct request_queue *q, struct bio *bio)
 	struct bio_vec *bvec;
 	sector_t sector;
 	int i;
-	int err = -EIO;
+	int err = 0;
 
 	sector = bio->bi_sector;
 	if (sector + (bio->bi_size >> SECTOR_SHIFT) >
-						get_capacity(bdev->bd_disk))
+						get_capacity(bdev->bd_disk)) {
+		err = -EIO;
 		goto out;
+	}
 
 	if (unlikely(bio->bi_rw & REQ_DISCARD)) {
 		err = 0;
-- 
1.7.1