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Subject[PATCH 1/2] blk-mq: add blk_mq_stop_hw_queues
Add a helper to iterate over all hw queues and stop them.  This is useful
for driver that implement PM suspend functionality.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
block/blk-mq.c | 12 ++++++++++++
include/linux/blk-mq.h | 1 +
2 files changed, 13 insertions(+)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index f21ec96..04050a3 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -679,6 +679,18 @@ void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx)
}
EXPORT_SYMBOL(blk_mq_start_hw_queue);

+void blk_mq_stop_hw_queues(struct request_queue *q)
+{
+ struct blk_mq_hw_ctx *hctx;
+ int i;
+
+ queue_for_each_hw_ctx(q, hctx, i) {
+ cancel_delayed_work(&hctx->delayed_work);
+ set_bit(BLK_MQ_S_STOPPED, &hctx->state);
+ }
+}
+EXPORT_SYMBOL(blk_mq_stop_hw_queues);
+
void blk_mq_start_stopped_hw_queues(struct request_queue *q)
{
struct blk_mq_hw_ctx *hctx;
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 746042ff..3368b97 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -136,6 +136,7 @@ void blk_mq_end_io(struct request *rq, int error);

void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);
void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx);
+void blk_mq_stop_hw_queues(struct request_queue *q);
void blk_mq_start_stopped_hw_queues(struct request_queue *q);

/*
--
1.7.10.4



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