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[v4,03/11] blk-mq: introduce blk_mq_quiesce_queue_nowait()

Message ID 20170605155925.7896-4-ming.lei@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Ming Lei June 5, 2017, 3:59 p.m. UTC 
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.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
 include/linux/blk-mq.h | 8 ++++++++
 1 file changed, 8 insertions(+)

Comments

Bart Van Assche June 5, 2017, 9:29 p.m. UTC | #1 
On Mon, 2017-06-05 at 23:59 +0800, Ming Lei wrote:
> 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.
> 
> Signed-off-by: Ming Lei <ming.lei@redhat.com>
> ---
>  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 1e480015d172..13d1196f492f 100644
> --- a/include/linux/blk-mq.h
> +++ b/include/linux/blk-mq.h
> @@ -266,6 +266,14 @@ 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.
>   */

Reviewed-by: Bart Van Assche <Bart.VanAssche@sandisk.com>
diff mbox

Patch

diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 1e480015d172..13d1196f492f 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -266,6 +266,14 @@  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.
  */