linux-kernel - [PATCH 4.15 127/146] scsi: qla2xxx: Skip IRQ affinity for Target QPairs

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Date:   Tue, 13 Mar 2018 16:24:54 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Quinn Tran <quinn.tran@...ium.com>,
        Himanshu Madhani <himanshu.madhani@...ium.com>,
        Hannes Reinecke <hare@...e.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 4.15 127/146] scsi: qla2xxx: Skip IRQ affinity for Target QPairs

4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Quinn Tran <quinn.tran@...ium.com>

commit d68b850e1bfb9afb24b888a946165a186a710195 upstream.

Fix co-existence between Block MQ and Target Mode. Block MQ and
initiator mode requires midlayer queue mapping to check for IRQ to be
affinitized. For target mode, it's not the case.

Fixes: 09620eeb62c41 ("scsi: qla2xxx: Add debug knob for user control workload")
Cc: <stable@...r.kernel.org> # 4.12+
Signed-off-by: Quinn Tran <quinn.tran@...ium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@...ium.com>
Reviewed-by: Hannes Reinecke <hare@...e.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/qla2xxx/qla_os.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -6609,9 +6609,14 @@ qla83xx_disable_laser(scsi_qla_host_t *v

 static int qla2xxx_map_queues(struct Scsi_Host *shost)
 {
+	int rc;
 	scsi_qla_host_t *vha = (scsi_qla_host_t *)shost->hostdata;

-	return blk_mq_pci_map_queues(&shost->tag_set, vha->hw->pdev);
+	if (USER_CTRL_IRQ(vha->hw))
+		rc = blk_mq_map_queues(&shost->tag_set);
+	else
+		rc = blk_mq_pci_map_queues(&shost->tag_set, vha->hw->pdev);
+	return rc;
 }

 static const struct pci_error_handlers qla2xxx_err_handler = {