ath5k: disable beacon filter when station is not associated

Ath5k driver has too many interrupts per second at idle
http://bugzilla.kernel.org/show_bug.cgi?id=11749

Signed-off-by: Martin Xu <martin.xu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath5k/base.c

@@ -240,6 +240,10 @@ static u64 ath5k_get_tsf(struct ieee80211_hw *hw);
 static void ath5k_reset_tsf(struct ieee80211_hw *hw);
 static int ath5k_beacon_update(struct ieee80211_hw *hw,
 		struct sk_buff *skb);
+static void ath5k_bss_info_changed(struct ieee80211_hw *hw,
+		struct ieee80211_vif *vif,
+		struct ieee80211_bss_conf *bss_conf,
+		u32 changes);
 
 static struct ieee80211_ops ath5k_hw_ops = {
 	.tx 		= ath5k_tx,
@@ -256,6 +260,7 @@ static struct ieee80211_ops ath5k_hw_ops = {
 	.get_tx_stats 	= ath5k_get_tx_stats,
 	.get_tsf 	= ath5k_get_tsf,
 	.reset_tsf 	= ath5k_reset_tsf,
+	.bss_info_changed = ath5k_bss_info_changed,
 };
 
 /*
@@ -2942,7 +2947,7 @@ static void ath5k_configure_filter(struct ieee80211_hw *hw,
 		sc->opmode != NL80211_IFTYPE_MESH_POINT &&
 		test_bit(ATH_STAT_PROMISC, sc->status))
 		rfilt |= AR5K_RX_FILTER_PROM;
-	if (sc->opmode == NL80211_IFTYPE_STATION ||
+	if ((sc->opmode == NL80211_IFTYPE_STATION && sc->assoc) ||
 		sc->opmode == NL80211_IFTYPE_ADHOC) {
 		rfilt |= AR5K_RX_FILTER_BEACON;
 	}
@@ -3083,4 +3088,32 @@ ath5k_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb)
 end:
 	return ret;
 }
+static void
+set_beacon_filter(struct ieee80211_hw *hw, bool enable)
+{
+	struct ath5k_softc *sc = hw->priv;
+	struct ath5k_hw *ah = sc->ah;
+	u32 rfilt;
+	rfilt = ath5k_hw_get_rx_filter(ah);
+	if (enable)
+		rfilt |= AR5K_RX_FILTER_BEACON;
+	else
+		rfilt &= ~AR5K_RX_FILTER_BEACON;
+	ath5k_hw_set_rx_filter(ah, rfilt);
+	sc->filter_flags = rfilt;
+}
 
+static void ath5k_bss_info_changed(struct ieee80211_hw *hw,
+				    struct ieee80211_vif *vif,
+				    struct ieee80211_bss_conf *bss_conf,
+				    u32 changes)
+{
+	struct ath5k_softc *sc = hw->priv;
+	if (changes & BSS_CHANGED_ASSOC) {
+		mutex_lock(&sc->lock);
+		sc->assoc = bss_conf->assoc;
+		if (sc->opmode == NL80211_IFTYPE_STATION)
+			set_beacon_filter(hw, sc->assoc);
+		mutex_unlock(&sc->lock);
+	}
+}

drivers/net/wireless/ath5k/base.h

@@ -179,6 +179,7 @@ struct ath5k_softc {
 
 	struct timer_list	calib_tim;	/* calibration timer */
 	int 			power_level;	/* Requested tx power in dbm */
+	bool			assoc;		/* assocate state */
 };
 
 #define ath5k_hw_hasbssidmask(_ah) \