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ath9k: fix TSF offset precision issue

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Dividing the beacon interval by ATH_BCBUF (8) truncates the result for
the default beacon interval of 100.
Fix the calculation by moving the division after conversion from TU to
microseconds.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Felix Fietkau 2013-12-19 18:01:50 +01:00 committed by John W. Linville
parent c32e4e518f
commit 63ded3f059
1 changed files with 4 additions and 3 deletions
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7
drivers/net/wireless/ath/ath9k/beacon.c
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@ -279,13 +279,14 @@ static void ath9k_set_tsfadjust(struct ath_softc *sc, struct ieee80211_vif *vif)
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
struct ath_vif *avp = (void *)vif->drv_priv;
u64 tsfadjust;
u32 tsfadjust;
if (avp->av_bslot == 0)
return;
tsfadjust = cur_conf->beacon_interval * avp->av_bslot / ATH_BCBUF;
avp->tsf_adjust = cpu_to_le64(TU_TO_USEC(tsfadjust));
tsfadjust = cur_conf->beacon_interval * avp->av_bslot;
tsfadjust = TU_TO_USEC(tsfadjust) / ATH_BCBUF;
avp->tsf_adjust = cpu_to_le64(tsfadjust);
ath_dbg(common, CONFIG, "tsfadjust is: %llu for bslot: %d\n",
(unsigned long long)tsfadjust, avp->av_bslot);