linux-kernel - [PATCH 5/6] blk-mq: collapse __blk_mq_drain_queue() into blk_mq_freeze

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Date:	Wed, 18 Jun 2014 11:21:11 -0400
From:	Tejun Heo <tj@...nel.org>
To:	axboe@...nel.dk
Cc:	linux-kernel@...r.kernel.org, kmo@...erainc.com,
	nab@...ux-iscsi.org, Tejun Heo <tj@...nel.org>
Subject: [PATCH 5/6] blk-mq: collapse __blk_mq_drain_queue() into blk_mq_freeze_queue()

Keeping __blk_mq_drain_queue() as a separate function doesn't buy us
anything and it's gonna be further simplified.  Let's flatten it into
its caller.

This patch doesn't make any functional change.

Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Jens Axboe <axboe@...nel.dk>
Cc: Nicholas A. Bellinger <nab@...ux-iscsi.org>
---
 block/blk-mq.c | 23 +++++++++--------------
 1 file changed, 9 insertions(+), 14 deletions(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index f49b2ab..eda78c8 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -108,8 +108,16 @@ static void blk_mq_queue_exit(struct request_queue *q)
 	__percpu_counter_add(&q->mq_usage_counter, -1, 1000000);
 }
 
-static void __blk_mq_drain_queue(struct request_queue *q)
+/*
+ * Guarantee no request is in use, so we can change any data structure of
+ * the queue afterward.
+ */
+void blk_mq_freeze_queue(struct request_queue *q)
 {
+	spin_lock_irq(q->queue_lock);
+	q->mq_freeze_depth++;
+	spin_unlock_irq(q->queue_lock);
+
 	while (true) {
 		s64 count;
 
@@ -124,19 +132,6 @@ static void __blk_mq_drain_queue(struct request_queue *q)
 	}
 }
 
-/*
- * Guarantee no request is in use, so we can change any data structure of
- * the queue afterward.
- */
-void blk_mq_freeze_queue(struct request_queue *q)
-{
-	spin_lock_irq(q->queue_lock);
-	q->mq_freeze_depth++;
-	spin_unlock_irq(q->queue_lock);
-
-	__blk_mq_drain_queue(q);
-}
-
 static void blk_mq_unfreeze_queue(struct request_queue *q)
 {
 	bool wake = false;
-- 
1.9.3

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