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@@ -0,0 +1,95 @@
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+--- a/ath/if_ath.c
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++++ b/ath/if_ath.c
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+@@ -379,6 +379,7 @@ static u_int32_t ath_get_clamped_maxtxpo
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+ static u_int32_t ath_set_clamped_maxtxpower(struct ath_softc *sc,
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+ u_int32_t new_clamped_maxtxpower);
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+
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++static void ath_bcn_timer(unsigned long arg);
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+ static void ath_poll_disable(struct net_device *dev);
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+ static void ath_poll_enable(struct net_device *dev);
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+ static void ath_fetch_idle_time(struct ath_softc *sc);
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+@@ -829,6 +830,10 @@ ath_attach(u_int16_t devid, struct net_d
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+ sc->sc_cal_ch.function = ath_calibrate;
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+ sc->sc_cal_ch.data = (unsigned long) dev;
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+
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++ init_timer(&sc->sc_bcntimer);
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++ sc->sc_bcntimer.function = ath_bcn_timer;
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++ sc->sc_bcntimer.data = (unsigned long) dev;
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++
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+ /* initialize DFS related variables */
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+ sc->sc_dfswait = 0;
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+ sc->sc_dfs_cac = 0;
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+@@ -2704,6 +2709,7 @@ ath_stop_locked(struct net_device *dev)
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+ DPRINTF(sc, ATH_DEBUG_RESET, "invalid=%u flags=0x%x\n",
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+ sc->sc_invalid, dev->flags);
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+
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++ del_timer_sync(&sc->sc_bcntimer);
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+ if (dev->flags & IFF_RUNNING) {
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+ /*
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+ * Shutdown the hardware and driver:
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+@@ -3006,6 +3012,7 @@ ath_reset(struct net_device *dev)
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+ struct ieee80211_channel *c;
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+ HAL_STATUS status;
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+
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++ del_timer_sync(&sc->sc_bcntimer);
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+ /*
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+ * XXX: starting the calibration too early seems to lead to
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+ * problems with the beacons.
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+@@ -5305,6 +5312,7 @@ ath_beacon_send(struct ath_softc *sc, in
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+ if (ath_chan_unavail_dbgmsg(sc))
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+ return;
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+
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++ mod_timer(&sc->sc_bcntimer, jiffies + sc->sc_bcntimer_reload);
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+ /*
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+ * Check if the previous beacon has gone out. If
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+ * not don't try to post another, skip this period
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+@@ -5487,6 +5495,18 @@ ath_beacon_free(struct ath_softc *sc)
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+ cleanup_ath_buf(sc, bf, BUS_DMA_TODEVICE);
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+ }
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+
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++static void ath_bcn_timer(unsigned long arg)
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++{
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++ struct net_device *dev = (struct net_device *)arg;
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++ struct ath_softc *sc = netdev_priv(dev);
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++ struct ath_hal *ah = sc->sc_ah;
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++
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++ if (!sc->sc_beacons)
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++ return;
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++
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++ ath_reset(dev);
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++}
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++
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+ /*
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+ * Configure the beacon and sleep timers.
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+ *
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+@@ -5523,6 +5543,7 @@ ath_beacon_config(struct ath_softc *sc,
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+ if (vap == NULL)
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+ vap = TAILQ_FIRST(&ic->ic_vaps); /* XXX */
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+
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++ del_timer_sync(&sc->sc_bcntimer);
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+ ni = vap->iv_bss;
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+
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+ /* TSF calculation is timing critical - we don't want to be interrupted here */
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+@@ -5699,6 +5720,9 @@ ath_beacon_config(struct ath_softc *sc,
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+ sc->sc_imask |= HAL_INT_SWBA;
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+ ath_set_beacon_cal(sc, 1);
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+ ath_beaconq_config(sc);
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++
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++ sc->sc_bcntimer_reload = msecs_to_jiffies(10 * (intval & HAL_BEACON_PERIOD));
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++ mod_timer(&sc->sc_bcntimer, jiffies + sc->sc_bcntimer_reload);
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+ } else
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+ ath_set_beacon_cal(sc, 0);
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+
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+--- a/ath/if_athvar.h
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++++ b/ath/if_athvar.h
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+@@ -789,6 +789,10 @@ struct ath_softc {
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+ u_int16_t sc_ledoff; /* off time for current blink */
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+ struct timer_list sc_ledtimer; /* led off timer */
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+
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++ /* beacon watchdog timer */
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++ u_int32_t sc_bcntimer_reload;
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++ struct timer_list sc_bcntimer;
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++
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+ struct ATH_TQ_STRUCT sc_fataltq; /* fatal error intr tasklet */
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+
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+ int sc_rxbufsize; /* rx size based on mtu */
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Felix Fietkau