Messages in this thread Patch in this message | | | Date | Fri, 25 Oct 2013 06:05:00 -0700 | From | Christoph Hellwig <> | Subject | [PATCH 1/2] blk-mq: add blk_mq_stop_hw_queues |
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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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