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 <bart.vanassche@xxxxxxxxxxx>
Cc: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Cc: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxxx>
---
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
