From: Ming Lei <ming.lei@redhat.com>
Date: Tue, 6 Jun 2017 15:22:02 +0000 (+0800)
Subject: blk-mq: introduce blk_mq_quiesce_queue_nowait()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=4f084b41a0c04a69067be98a210e6b50969f9945;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

blk-mq: introduce blk_mq_quiesce_queue_nowait()

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>
---

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
@@ -262,6 +262,14 @@ int blk_mq_reinit_tagset(struct blk_mq_tag_set *set);
 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.