scsi: Remove a blk_mq_run_hw_queues() call

blk_mq_kick_requeue_list() calls blk_mq_run_hw_queues() asynchronously.
Leave out the direct blk_mq_run_hw_queues() call. This patch causes
scsi_run_queue() to call blk_mq_run_hw_queues() asynchronously instead
of synchronously. Since scsi_run_queue() is not called from the hot I/O
submission path, this patch does not affect the hot path.

This patch prepares for allowing blk_mq_run_hw_queue() to sleep if
BLK_MQ_F_BLOCKING has been set. scsi_run_queue() may be called from
atomic context and must not sleep. Hence the removal of the
blk_mq_run_hw_queues(q, false) call. See also scsi_unblock_requests().

Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: "Martin K. Petersen" <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20230721172731.955724-3-bvanassche@acm.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 414d29eef96865c522a845c72ac7b0e20992215d..d4c514ab9fe876d40af2b19e59c4954923bab37e 100644 (file)
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -447,8 +447,8 @@ static void scsi_run_queue(struct request_queue *q)
        if (!list_empty(&sdev->host->starved_list))
                scsi_starved_list_run(sdev->host);
 
+       /* Note: blk_mq_kick_requeue_list() runs the queue asynchronously. */
        blk_mq_kick_requeue_list(q);
-       blk_mq_run_hw_queues(q, false);
 }
 
 void scsi_requeue_run_queue(struct work_struct *work)