--- a/ath/if_ath.c
+++ b/ath/if_ath.c
@@ -379,6 +379,7 @@ static u_int32_t ath_get_clamped_maxtxpo
 static u_int32_t ath_set_clamped_maxtxpower(struct ath_softc *sc, 
 		u_int32_t new_clamped_maxtxpower);
 
+static void ath_bcn_timer(unsigned long arg);
 static void ath_poll_disable(struct net_device *dev);
 static void ath_poll_enable(struct net_device *dev);
 static void ath_fetch_idle_time(struct ath_softc *sc);
@@ -829,6 +830,10 @@ ath_attach(u_int16_t devid, struct net_d
 	sc->sc_cal_ch.function = ath_calibrate;
 	sc->sc_cal_ch.data = (unsigned long) dev;
 
+	init_timer(&sc->sc_bcntimer);
+	sc->sc_bcntimer.function = ath_bcn_timer;
+	sc->sc_bcntimer.data = (unsigned long) dev;
+
 	/* initialize DFS related variables */
 	sc->sc_dfswait = 0;
 	sc->sc_dfs_cac = 0;
@@ -2704,6 +2709,7 @@ ath_stop_locked(struct net_device *dev)
 	DPRINTF(sc, ATH_DEBUG_RESET, "invalid=%u flags=0x%x\n",
 		sc->sc_invalid, dev->flags);
 
+	del_timer_sync(&sc->sc_bcntimer);
 	if (dev->flags & IFF_RUNNING) {
 		/*
 		 * Shutdown the hardware and driver:
@@ -3006,6 +3012,7 @@ ath_reset(struct net_device *dev)
 	struct ieee80211_channel *c;
 	HAL_STATUS status;
 
+	del_timer_sync(&sc->sc_bcntimer);
 	/*
 	 * XXX: starting the calibration too early seems to lead to
 	 * problems with the beacons.
@@ -5305,6 +5312,7 @@ ath_beacon_send(struct ath_softc *sc, in
 	if (ath_chan_unavail_dbgmsg(sc))
 		return;
 
+	mod_timer(&sc->sc_bcntimer, jiffies + sc->sc_bcntimer_reload);
 	/*
 	 * Check if the previous beacon has gone out.  If
 	 * not don't try to post another, skip this period
@@ -5487,6 +5495,18 @@ ath_beacon_free(struct ath_softc *sc)
 		cleanup_ath_buf(sc, bf, BUS_DMA_TODEVICE);
 }
 
+static void ath_bcn_timer(unsigned long arg)
+{
+	struct net_device *dev = (struct net_device *)arg;
+	struct ath_softc *sc = netdev_priv(dev);
+	struct ath_hal *ah = sc->sc_ah;
+
+	if (!sc->sc_beacons)
+		return;
+
+	ath_reset(dev);
+}
+
 /*
  * Configure the beacon and sleep timers.
  *
@@ -5523,6 +5543,7 @@ ath_beacon_config(struct ath_softc *sc, 
 	if (vap == NULL)
 		vap = TAILQ_FIRST(&ic->ic_vaps);   /* XXX */
 
+	del_timer_sync(&sc->sc_bcntimer);
 	ni = vap->iv_bss;
 
 	/* TSF calculation is timing critical - we don't want to be interrupted here */
@@ -5699,6 +5720,9 @@ ath_beacon_config(struct ath_softc *sc, 
 			sc->sc_imask |= HAL_INT_SWBA;
 			ath_set_beacon_cal(sc, 1);
 			ath_beaconq_config(sc);
+
+			sc->sc_bcntimer_reload = msecs_to_jiffies(10 * (intval & HAL_BEACON_PERIOD));
+			mod_timer(&sc->sc_bcntimer, jiffies + sc->sc_bcntimer_reload);
 		} else
 			ath_set_beacon_cal(sc, 0);
 
--- a/ath/if_athvar.h
+++ b/ath/if_athvar.h
@@ -789,6 +789,10 @@ struct ath_softc {
 	u_int16_t sc_ledoff;			/* off time for current blink */
 	struct timer_list sc_ledtimer;		/* led off timer */
 
+	/* beacon watchdog timer */
+	u_int32_t sc_bcntimer_reload;
+	struct timer_list sc_bcntimer;
+
 	struct ATH_TQ_STRUCT sc_fataltq;	/* fatal error intr tasklet */
 
 	int sc_rxbufsize;			/* rx size based on mtu */