scsi: libcxgbi: in case of vlan pass 0 as ifindex to find route

In case of vlan pass 0 as ifindex to find route instead of passing
real_dev ifindex, if we pass real_dev ifindex then
ip_route_output_ports() and ip6_route_output() will check for route
through real_dev not through vlan interface.
Signed-off-by: NVarun Prakash <varun@chelsio.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/cxgbi/libcxgbi.c

@@ -2554,7 +2554,10 @@ struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
 			goto err_out;
 		}
 
-		ifindex = hba->ndev->ifindex;
+		rtnl_lock();
+		if (!vlan_uses_dev(hba->ndev))
+			ifindex = hba->ndev->ifindex;
+		rtnl_unlock();
 	}
 
 	if (dst_addr->sa_family == AF_INET) {