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--- a/ath/if_ath.c
+++ b/ath/if_ath.c
@@ -5483,6 +5483,9 @@ ath_beacon_config(struct ath_softc *sc,
ath_beacon_dturbo_config(vap, intval &
~(HAL_BEACON_RESET_TSF | HAL_BEACON_ENA));
#endif
+ if ((nexttbtt & HAL_BEACON_PERIOD) - (ath_hal_gettsf32(ah) >> 10)
+ <= ath_hal_sw_beacon_response_time)
+ nexttbtt += intval;
sc->sc_nexttbtt = nexttbtt;
ath_hal_beaconinit(ah, nexttbtt, intval);
if (intval & HAL_BEACON_RESET_TSF) {
--- a/ath_hal/ah_os.c
+++ b/ath_hal/ah_os.c
@@ -71,6 +71,7 @@ static int ath_hal_debug = 99;
int ath_hal_dma_beacon_response_time = 2; /* in TUs */
int ath_hal_sw_beacon_response_time = 10; /* in TUs */
int ath_hal_additional_swba_backoff = 0; /* in TUs */
+EXPORT_SYMBOL(ath_hal_sw_beacon_response_time);
struct ath_hal *
_ath_hal_attach(u_int16_t devid, HAL_SOFTC sc,
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