From 238e7db9357bfe1ce3d6f7ac1e60e595e9d46b7b Mon Sep 17 00:00:00 2001
From: Tejun Heo <htejun@gmail.com>
Date: Sat, 4 Feb 2006 23:27:38 -0800
Subject: [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>
---
 block/elevator.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'block')

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
-- 
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