diff --git a/sys/net/iflib.c b/sys/net/iflib.c
index 01da882f0d1..d1098d98ff3 100644
--- a/sys/net/iflib.c
+++ b/sys/net/iflib.c
@@ -4473,9 +4473,14 @@ iflib_vlan_register(void *arg, if_t ifp, uint16_t vtag)
 {
 	if_ctx_t ctx = if_getsoftc(ifp);
 
-	if ((void *)ctx != arg)
+	device_printf(ctx->ifc_dev,"iflib_vlan_register: start\n");
+	
+	if ((void *)ifp != arg) {
+		device_printf(ctx->ifc_dev,"device mismatch: %p, %p\n",
+			      ifp, arg);
 		return;
-
+	}
+	
 	if ((vtag == 0) || (vtag > 4095))
 		return;
 
@@ -4498,8 +4503,13 @@ iflib_vlan_unregister(void *arg, if_t ifp, uint16_t vtag)
 {
 	if_ctx_t ctx = if_getsoftc(ifp);
 
-	if ((void *)ctx != arg)
+	device_printf(ctx->ifc_dev,"iflib_vlan_unregister: start\n");
+
+	if ((void *)ifp != arg) {
+		device_printf(ctx->ifc_dev,"device mismatch: %p, %p\n",
+			      ifp, arg);
 		return;
+	}
 
 	if ((vtag == 0) || (vtag > 4095))
 		return;
@@ -5830,12 +5840,14 @@ iflib_register(if_ctx_t ctx)
 		iflags |= IFF_BROADCAST | IFF_SIMPLEX;
 	if_setflags(ifp, iflags);
 	ctx->ifc_vlan_attach_event =
-		EVENTHANDLER_REGISTER(vlan_config, iflib_vlan_register, ctx,
+		EVENTHANDLER_REGISTER(vlan_config, iflib_vlan_register, ifp,
 							  EVENTHANDLER_PRI_FIRST);
 	ctx->ifc_vlan_detach_event =
-		EVENTHANDLER_REGISTER(vlan_unconfig, iflib_vlan_unregister, ctx,
+		EVENTHANDLER_REGISTER(vlan_unconfig, iflib_vlan_unregister, ifp,
 							  EVENTHANDLER_PRI_FIRST);
 
+	device_printf(dev,"event hander:vlan_config:ifp:%p\n",ifp);
+	
 	if ((sctx->isc_flags & IFLIB_DRIVER_MEDIA) == 0) {
 		ctx->ifc_mediap = &ctx->ifc_media;
 		ifmedia_init(ctx->ifc_mediap, IFM_IMASK,