diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index 72b1c28e4dae..39ee33398df2 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -2803,11 +2803,16 @@ qla2x00_set_isp_flags(struct qla_hw_data *ha)
 	else {
 		/* Get adapter physical port no from interrupt pin register. */
 		pci_read_config_byte(ha->pdev, PCI_INTERRUPT_PIN, &ha->port_no);
-		if (IS_QLA25XX(ha) || IS_QLA2031(ha) ||
-		    IS_QLA27XX(ha) || IS_QLA28XX(ha))
-			ha->port_no--;
-		else
-			ha->port_no = !(ha->port_no & 1);
+		if (ha->port_no == 0) {
+			/* None of INT[A|B|C|D] may be virtualized by vfio */
+			ha->port_no = PCI_FUNC(ha->pdev->devfn);
+		} else {
+			if (IS_QLA25XX(ha) || IS_QLA2031(ha) ||
+			    IS_QLA27XX(ha) || IS_QLA28XX(ha))
+				ha->port_no--;
+			else
+				ha->port_no = !(ha->port_no & 1);
+		}
 	}
 
 	ql_dbg_pci(ql_dbg_init, ha->pdev, 0x000b,