[PATCH] block: request_queue->ordcolor must not be flipped on SOFTBARRIER

q->ordcolor must not be flipped on SOFTBARRIER.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Acked-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/block/elevator.c b/block/elevator.c
index 96a61e029ce5..2fc269f69726 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -323,7 +323,8 @@ void __elv_add_request(request_queue_t *q, struct request *rq, int where,
                 /*
                  * toggle ordered color
                  */
-                q->ordcolor ^= 1;
+                if (blk_barrier_rq(rq))
+                        q->ordcolor ^= 1;
 
                 /*
                  * barriers implicitly indicate back insertion