Index: rtl81x9reg.h
===================================================================
RCS file: /cvs/src/sys/dev/ic/rtl81x9reg.h,v
retrieving revision 1.98
diff -u -p -r1.98 rtl81x9reg.h
--- rtl81x9reg.h	20 Apr 2016 12:15:24 -0000	1.98
+++ rtl81x9reg.h	4 Nov 2016 10:25:50 -0000
@@ -888,6 +888,7 @@ struct rl_softc {
 	struct mbuf		*rl_tail;
 	u_int32_t		rl_rxlenmask;
 	struct timeout		timer_handle;
+	struct task		rl_start;
 
 	int			rl_txstart;
 	u_int32_t		rl_flags;
Index: re.c
===================================================================
RCS file: /cvs/src/sys/dev/ic/re.c,v
retrieving revision 1.193
diff -u -p -r1.193 re.c
--- re.c	10 Aug 2016 14:27:17 -0000	1.193
+++ re.c	4 Nov 2016 10:25:50 -0000
@@ -162,6 +162,7 @@ int	re_rxeof(struct rl_softc *);
 int	re_txeof(struct rl_softc *);
 void	re_tick(void *);
 void	re_start(struct ifnet *);
+void	re_txstart(void *);
 int	re_ioctl(struct ifnet *, u_long, caddr_t);
 void	re_watchdog(struct ifnet *);
 int	re_ifmedia_upd(struct ifnet *);
@@ -1041,6 +1042,7 @@ re_attach(struct rl_softc *sc, const cha
 	re_wol(ifp, 0);
 #endif
 	timeout_set(&sc->timer_handle, re_tick, sc);
+	task_set(&sc->rl_start, re_txstart, sc);
 
 	/* Take PHY out of power down mode. */
 	if (sc->rl_flags & RL_FLAG_PHYWAKE_PM) {
@@ -1466,7 +1468,7 @@ re_txeof(struct rl_softc *sc)
 	if (ifq_is_oactive(&ifp->if_snd))
 		ifq_restart(&ifp->if_snd);
 	else if (tx_free < sc->rl_ldata.rl_tx_desc_cnt)
-		CSR_WRITE_1(sc, sc->rl_txstart, RL_TXSTART_START);
+		ifq_serialize(&ifp->if_snd, &sc->rl_start);
 	else
 		ifp->if_timer = 0;
 
@@ -1789,6 +1791,14 @@ fail_unload:
 	return (error);
 }
 
+void
+re_txstart(void *xsc)
+{
+	struct rl_softc *sc = xsc;
+
+	CSR_WRITE_1(sc, sc->rl_txstart, RL_TXSTART_START);
+}
+
 /*
  * Main transmit routine for C+ and gigE NICs.
  */
@@ -1852,7 +1862,7 @@ re_start(struct ifnet *ifp)
 
 	sc->rl_ldata.rl_txq_prodidx = idx;
 
-	CSR_WRITE_1(sc, sc->rl_txstart, RL_TXSTART_START);
+	ifq_serialize(&ifp->if_snd, &sc->rl_start);
 }
 
 int