diff -r 45046906401c sys/dev/cxgbe/t4_main.c
--- a/sys/dev/cxgbe/t4_main.c	Sun Aug 06 13:56:06 2017 -0700
+++ b/sys/dev/cxgbe/t4_main.c	Mon Aug 07 12:34:02 2017 -0700
@@ -4227,6 +4227,14 @@ cxgbe_init_synchronized(struct vi_info *
 	if (rc)
 		goto done;	/* error message displayed already */
 
+	PORT_LOCK(pi);
+	if (pi->up_vis++ == 0) {
+		t4_update_port_info(pi);
+		build_medialist(vi->pi, &vi->media);
+		init_l1cfg(pi);
+	}
+	PORT_UNLOCK(pi);
+
 	rc = -t4_enable_vi(sc, sc->mbox, vi->viid, true, true);
 	if (rc != 0) {
 		if_printf(ifp, "enable_vi failed: %d\n", rc);
@@ -4257,11 +4265,6 @@ cxgbe_init_synchronized(struct vi_info *
 
 	/* all ok */
 	PORT_LOCK(pi);
-	if (pi->up_vis++ == 0) {
-		t4_update_port_info(pi);
-		build_medialist(vi->pi, &vi->media);
-		init_l1cfg(pi);
-	}
 	ifp->if_drv_flags |= IFF_DRV_RUNNING;
 
 	if (pi->nvi > 1 || sc->flags & IS_VF)