From 4f084b41a0c04a69067be98a210e6b50969f9945 Mon Sep 17 00:00:00 2001
From: Ming Lei <ming.lei@redhat.com>
Date: Tue, 6 Jun 2017 23:22:02 +0800
Subject: [PATCH] blk-mq: introduce blk_mq_quiesce_queue_nowait()
Git-commit: 4f084b41a0c04a69067be98a210e6b50969f9945
Patch-mainline: v4.13-rc1
References: fate#322738,fate#322919,fate#322950,fate#323773

This patch introduces blk_mq_quiesce_queue_nowait() so
that we can workaround mpt3sas for quiescing its queue.

Once mpt3sas is fixed, we can remove this helper.

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>

---
 include/linux/blk-mq.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 99348adb3e16..78a8b64074ea 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -263,6 +263,14 @@ int blk_mq_map_queues(struct blk_mq_tag_set *set);
 void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues);
 
 /*
+ * FIXME: this helper is just for working around mpt3sas.
+ */
+static inline void blk_mq_quiesce_queue_nowait(struct request_queue *q)
+{
+	blk_mq_stop_hw_queues(q);
+}
+
+/*
  * Driver command data is immediately after the request. So subtract request
  * size to get back to the original request, add request size to get the PDU.
  */
-- 
2.13.1