From f660174e8bcdb2bf99129f9f7c86e5fc0e830f85 Mon Sep 17 00:00:00 2001
From: Ming Lei <ming.lei@redhat.com>
Date: Tue, 6 Jun 2017 23:22:04 +0800
Subject: [PATCH] blk-mq: use the introduced blk_mq_unquiesce_queue()
Git-commit: f660174e8bcdb2bf99129f9f7c86e5fc0e830f85
Patch-mainline: v4.13-rc1
References: fate#322738,fate#322919,fate#322950,fate#323773

blk_mq_unquiesce_queue() is used for unquiescing the
queue explicitly, so replace blk_mq_start_stopped_hw_queues()
with it.

For the scsi part, this patch takes Bart's suggestion to
switch to block quiesce/unquiesce API completely.

Cc: linux-nvme@lists.infradead.org
Cc: linux-scsi@vger.kernel.org
Cc: dm-devel@redhat.com
Reviewed-by: Bart Van Assche <Bart.VanAssche@sandisk.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Coly Li <colyli@suse.de>

---
 drivers/md/dm-rq.c       | 2 +-
 drivers/nvme/host/core.c | 2 +-
 drivers/scsi/scsi_lib.c  | 4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c
index fafd5326e572..c6ebc5b1e00e 100644
--- a/drivers/md/dm-rq.c
+++ b/drivers/md/dm-rq.c
@@ -71,7 +71,7 @@ static void dm_old_start_queue(struct request_queue *q)
 
 static void dm_mq_start_queue(struct request_queue *q)
 {
-	blk_mq_start_stopped_hw_queues(q, true);
+	blk_mq_unquiesce_queue(q);
 	blk_mq_kick_requeue_list(q);
 }
 
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 0ddd6b9af7fc..05f713e866f6 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2672,7 +2672,7 @@ void nvme_start_queues(struct nvme_ctrl *ctrl)
 
 	mutex_lock(&ctrl->namespaces_mutex);
 	list_for_each_entry(ns, &ctrl->namespaces, list) {
-		blk_mq_start_stopped_hw_queues(ns->queue, true);
+		blk_mq_unquiesce_queue(ns->queue);
 		blk_mq_kick_requeue_list(ns->queue);
 	}
 	mutex_unlock(&ctrl->namespaces_mutex);
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index b5f310b9e910..fb18ed284e55 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -2962,7 +2962,7 @@ scsi_internal_device_block(struct scsi_device *sdev, bool wait)
 		if (wait)
 			blk_mq_quiesce_queue(q);
 		else
-			blk_mq_stop_hw_queues(q);
+			blk_mq_quiesce_queue_nowait(q);
 	} else {
 		spin_lock_irqsave(q->queue_lock, flags);
 		blk_stop_queue(q);
@@ -3016,7 +3016,7 @@ scsi_internal_device_unblock(struct scsi_device *sdev,
 		return -EINVAL;
 
 	if (q->mq_ops) {
-		blk_mq_start_stopped_hw_queues(q, false);
+		blk_mq_unquiesce_queue(q);
 	} else {
 		spin_lock_irqsave(q->queue_lock, flags);
 		blk_start_queue(q);
-- 
2.13.1