ath9k: Fix bug in rate table management

The proper rate table wouldn't be used if a disassoc
happens and a new attempt is made to associate using
wpa_supplicant. This patch fixes it by storing the rate
table to be used on association.
Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath9k/core.h

@@ -702,6 +702,7 @@ struct ath_softc {
 	/* Rate */
 	struct ieee80211_rate rates[IEEE80211_NUM_BANDS][ATH_RATE_MAX];
 	struct ath_rate_table *hw_rate_table[ATH9K_MODE_MAX];
+	struct ath_rate_table *cur_rate_table;
 	u8 sc_protrix;
 
 	/* Channel, Band */

drivers/net/wireless/ath9k/rc.c

@@ -817,7 +817,7 @@ static void ath_rc_ratefind(struct ath_softc *sc,
 	struct ath_rate_table *rate_table;
 	struct ieee80211_tx_rate *rates = tx_info->control.rates;
 
-	rate_table = sc->hw_rate_table[sc->sc_curmode];
+	rate_table = sc->cur_rate_table;
 	rix = ath_rc_ratefind_ht(sc, ath_rc_priv, rate_table, 1,
 				 is_probe, is_retry);
 	nrix = rix;
@@ -877,7 +877,7 @@ static void ath_rc_ratefind(struct ath_softc *sc,
 	if ((sc->sc_curmode == ATH9K_MODE_11NG_HT20) ||
 	    (sc->sc_curmode == ATH9K_MODE_11NG_HT40PLUS) ||
 	    (sc->sc_curmode == ATH9K_MODE_11NG_HT40MINUS)) {
-		u8  dot11rate = rate_table->info[rix].dot11rate;
+		u8 dot11rate = rate_table->info[rix].dot11rate;
 		u8 phy = rate_table->info[rix].phy;
 		if (i == 4 &&
 		    ((dot11rate == 2 && phy == WLAN_RC_PHY_HT_40_SS) ||
@@ -1094,7 +1094,7 @@ static void ath_rc_update_ht(struct ath_softc *sc,
 	int rate;
 	u8 last_per;
 	bool state_change = false;
-	struct ath_rate_table *rate_table = sc->hw_rate_table[sc->sc_curmode];
+	struct ath_rate_table *rate_table = sc->cur_rate_table;
 	int size = ath_rc_priv->rate_table_size;
 
 	if ((tx_rate < 0) || (tx_rate > rate_table->rate_cnt))
@@ -1254,7 +1254,7 @@ static void ath_rc_tx_status(struct ath_softc *sc,
 	u8 flags;
 	u32 i = 0, rix;
 
-	rate_table = sc->hw_rate_table[sc->sc_curmode];
+	rate_table = sc->cur_rate_table;
 
 	/*
 	 * If the first rate is not the final index, there
@@ -1432,6 +1432,7 @@ static void ath_rc_init(struct ath_softc *sc,
 	ath_rc_priv->max_valid_rate = k;
 	ath_rc_sort_validrates(rate_table, ath_rc_priv);
 	ath_rc_priv->rate_max_phy = ath_rc_priv->valid_rate_index[k-4];
+	sc->cur_rate_table = rate_table;
 }
 
 /* Rate Control callbacks */