diff mbox

[v3,06/11] dm: Use BLK_MQ_S_STOPPED instead of QUEUE_FLAG_STOPPED in blk-mq code

Message ID e5facfd0-82d5-10cb-712b-13d7950b78b8@sandisk.com (mailing list archive)
State Not Applicable
Headers show

Commit Message

Bart Van Assche Oct. 18, 2016, 9:51 p.m. UTC 
Instead of manipulating both QUEUE_FLAG_STOPPED and BLK_MQ_S_STOPPED
in the dm start and stop queue functions, only manipulate the latter
flag.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Mike Snitzer <snitzer@redhat.com>
---
 drivers/md/dm-rq.c | 18 ++----------------
 1 file changed, 2 insertions(+), 16 deletions(-)

Comments

Christoph Hellwig Oct. 19, 2016, 1:28 p.m. UTC | #1 
This looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>

On Tue, Oct 18, 2016 at 02:51:33PM -0700, Bart Van Assche wrote:
>  static void dm_mq_start_queue(struct request_queue *q)
>  {
> -	unsigned long flags;
> -
> -	spin_lock_irqsave(q->queue_lock, flags);
> -	queue_flag_clear(QUEUE_FLAG_STOPPED, q);
> -	spin_unlock_irqrestore(q->queue_lock, flags);
> -
>  	blk_mq_start_stopped_hw_queues(q, true);
>  	blk_mq_kick_requeue_list(q);

FYI, I'm tempted to say we should always call blk_mq_kick_requeue_list
from blk_mq_start_stopped_hw_queues, but that's a separate issue.
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diff mbox

Patch

diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c
index d5cec26..9c34606 100644
--- a/drivers/md/dm-rq.c
+++ b/drivers/md/dm-rq.c
@@ -75,12 +75,6 @@  static void dm_old_start_queue(struct request_queue *q)
 
 static void dm_mq_start_queue(struct request_queue *q)
 {
-	unsigned long flags;
-
-	spin_lock_irqsave(q->queue_lock, flags);
-	queue_flag_clear(QUEUE_FLAG_STOPPED, q);
-	spin_unlock_irqrestore(q->queue_lock, flags);
-
 	blk_mq_start_stopped_hw_queues(q, true);
 	blk_mq_kick_requeue_list(q);
 }
@@ -105,16 +99,8 @@  static void dm_old_stop_queue(struct request_queue *q)
 
 static void dm_mq_stop_queue(struct request_queue *q)
 {
-	unsigned long flags;
-
-	spin_lock_irqsave(q->queue_lock, flags);
-	if (blk_queue_stopped(q)) {
-		spin_unlock_irqrestore(q->queue_lock, flags);
+	if (blk_mq_queue_stopped(q))
 		return;
-	}
-
-	queue_flag_set(QUEUE_FLAG_STOPPED, q);
-	spin_unlock_irqrestore(q->queue_lock, flags);
 
 	/* Avoid that requeuing could restart the queue. */
 	blk_mq_cancel_requeue_work(q);
@@ -341,7 +327,7 @@  static void __dm_mq_kick_requeue_list(struct request_queue *q, unsigned long mse
 	unsigned long flags;
 
 	spin_lock_irqsave(q->queue_lock, flags);
-	if (!blk_queue_stopped(q))
+	if (!blk_mq_queue_stopped(q))
 		blk_mq_delay_kick_requeue_list(q, msecs);
 	spin_unlock_irqrestore(q->queue_lock, flags);
 }