From f371116b29874cd6337bf859f5da675f25573c39 Mon Sep 17 00:00:00 2001
From: Tao Ma <boyu.mt@taobao.com>
Date: Tue, 25 Oct 2011 10:20:05 +0200
Subject: [PATCH] --- yaml --- r: 273811 b: refs/heads/master c:
 5e08159197b5b98a6648a172008de23f420e6c11 h: refs/heads/master i:   273809:
 a91eae96c22eae6f4356247036c205576d3b41aa   273807:
 f78d240958d78d7432774bc8663f1cefea7e9736 v: v3

---
 [refs]                | 2 +-
 trunk/block/blk-tag.c | 6 ++++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/[refs] b/[refs]
index 3df9f0842d30..4135f98f32f5 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 83157223defe3be490cfea048e83451b6f254216
+refs/heads/master: 5e08159197b5b98a6648a172008de23f420e6c11
diff --git a/trunk/block/blk-tag.c b/trunk/block/blk-tag.c
index ece65fc4c79b..e74d6d13838f 100644
--- a/trunk/block/blk-tag.c
+++ b/trunk/block/blk-tag.c
@@ -286,12 +286,14 @@ void blk_queue_end_tag(struct request_queue *q, struct request *rq)
 
 	BUG_ON(tag == -1);
 
-	if (unlikely(tag >= bqt->real_max_depth))
+	if (unlikely(tag >= bqt->max_depth)) {
 		/*
 		 * This can happen after tag depth has been reduced.
-		 * FIXME: how about a warning or info message here?
+		 * But tag shouldn't be larger than real_max_depth.
 		 */
+		WARN_ON(tag >= bqt->real_max_depth);
 		return;
+	}
 
 	list_del_init(&rq->queuelist);
 	rq->cmd_flags &= ~REQ_QUEUED;