[PATCH 2/3] scsi: Add scsi_restart_queues()
From: Bart Van Assche <hidden>
Date: 2017-03-31 23:12:04
Subsystem:
scsi subsystem, the rest · Maintainers:
"James E.J. Bottomley", "Martin K. Petersen", Linus Torvalds
This patch avoids that if multiple SCSI devices are associated with a SCSI host that a queue can get stuck if scsi_queue_rq() returns "busy". Signed-off-by: Bart Van Assche <redacted> Cc: Martin K. Petersen <martin.petersen@oracle.com> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.com> --- drivers/scsi/scsi_lib.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index c1519660824b..1d804e33971a 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c@@ -555,6 +555,21 @@ void scsi_run_host_queues(struct Scsi_Host *shost) scsi_run_queue(sdev->request_queue); } +static void scsi_restart_queues(struct request_queue *q) +{ + struct scsi_device *sdev = q->queuedata; + struct Scsi_Host *shost = sdev->host; + unsigned long flags; + + spin_lock_irqsave(shost->host_lock, flags); + __shost_for_each_device(sdev, shost) { + q = sdev->request_queue; + if (q->mq_ops && !blk_queue_dying(q)) + blk_mq_run_hw_queues(q, true); + } + spin_unlock_irqrestore(shost->host_lock, flags); +} + static void scsi_uninit_cmd(struct scsi_cmnd *cmd) { if (!blk_rq_is_passthrough(cmd->request)) {
@@ -2156,6 +2171,7 @@ struct request_queue *scsi_alloc_queue(struct scsi_device *sdev) static const struct blk_mq_ops scsi_mq_ops = { .queue_rq = scsi_queue_rq, + .restart_queues = scsi_restart_queues, .complete = scsi_softirq_done, .timeout = scsi_timeout, .init_request = scsi_init_request,
--
2.12.0