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ath9k: Update Beacon timers based on timestamp from the AP

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Some APs seem to drift away from the expected TBTT (timestamp %
beacon_int_in_usec differs quite a bit from zero) which can result in
us waking up way too early to receive a Beacon frame. In order to work
around this, re-configure the Beacon timers after having received a
Beacon frame from the AP (i.e., when we know the offset between the
expected TBTT and the actual time the AP is sending out the Beacon
frame).

Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Jouni Malinen
2009-05-20 21:59:08 +03:00
committed by John W. Linville
parent 267a901274
commit ccdfeab653
3 changed files with 16 additions and 1 deletions
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7
drivers/net/wireless/ath/ath9k/recv.c
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@@ -521,6 +521,13 @@ static void ath_rx_ps_beacon(struct ath_softc *sc, struct sk_buff *skb)
if (memcmp(sc->curbssid, mgmt->bssid, ETH_ALEN) != 0)
return; /* not from our current AP */
if (sc->sc_flags & SC_OP_BEACON_SYNC) {
sc->sc_flags &= ~SC_OP_BEACON_SYNC;
DPRINTF(sc, ATH_DBG_PS, "Reconfigure Beacon timers based on "
"timestamp from the AP\n");
ath_beacon_config(sc, NULL);
}
if (!(sc->hw->conf.flags & IEEE80211_CONF_PS)) {
/* We are not in PS mode anymore; remain awake */
DPRINTF(sc, ATH_DBG_PS, "Not in PS mode anymore, remain "