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--- a/drivers/net/wireless/ath/ath9k/beacon.c
+++ b/drivers/net/wireless/ath/ath9k/beacon.c
@@ -505,7 +505,7 @@ static void ath_beacon_config_ap(struct
/* NB: the beacon interval is kept internally in TU's */
intval = TU_TO_USEC(conf->beacon_interval);
intval /= ATH_BCBUF; /* for staggered beacons */
- nexttbtt = intval;
+ nexttbtt = roundup(ath9k_hw_gettsf32(ah) + TU_TO_USEC(FUDGE), intval);
/*
* In AP mode we enable the beacon timers and SWBA interrupts to
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