scsi: qla2xxx: Allow NVMe IO to resume with short cable pull

Current driver report dev_loss_tmo to 0 for NVMe devices with short cable
pull.  This causes NVMe controller to be freed along with NVMe namespace.
The side affect is IO would stop.  By not setting dev_loss_tmo to 0, NVMe
namespace would stay until cable is plugged back in.  This allows IO to
resume afterward.

[mkp: commit desc]
Signed-off-by: Arun Easi <aeasi@marvell.com>
Signed-off-by: Quinn Tran <qutran@marvell.com>
Signed-off-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qla2xxx/qla_nvme.c

@@ -653,7 +653,9 @@ void qla_nvme_unregister_remote_port(struct fc_port *fcport)
 	    "%s: unregister remoteport on %p %8phN\n",
 	    __func__, fcport, fcport->port_name);
 
-	nvme_fc_set_remoteport_devloss(fcport->nvme_remote_port, 0);
+	if (test_bit(PFLG_DRIVER_REMOVING, &fcport->vha->pci_flags))
+		nvme_fc_set_remoteport_devloss(fcport->nvme_remote_port, 0);
+
 	init_completion(&fcport->nvme_del_done);
 	ret = nvme_fc_unregister_remoteport(fcport->nvme_remote_port);
 	if (ret)