Re: [PATCH 1/2] blk-mq: add blk_mq_stop_hw_queues

[Jens Axboe <axboe@kernel.dk>]

On Fri, Oct 25 2013, Christoph Hellwig wrote:
> 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);
> +	}

I changed this to call blk_mq_stop_hw_queue() instead.

-- 
Jens Axboe