ath9k: Maintain rate table choice after association

A scan run after association would change sc_curmode which is
used to get the current rate table. This patch fixes it
by removing sc_curmode and setting the rate table in usage in cur_rate_table
on association.
Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath9k/beacon.c

@@ -106,7 +106,7 @@ static void ath_beacon_setup(struct ath_softc *sc,
 	 * XXX everything at min xmit rate
 	 */
 	rix = 0;
-	rt = sc->hw_rate_table[sc->sc_curmode];
+	rt = sc->cur_rate_table;
 	rate = rt->info[rix].ratecode;
 	if (sc->sc_flags & SC_OP_PREAMBLE_SHORT)
 		rate |= rt->info[rix].short_preamble;

drivers/net/wireless/ath9k/core.h

@@ -646,7 +646,6 @@ struct ath_softc {
 	u8 sc_tx_chainmask;
 	u8 sc_rx_chainmask;
 	enum ath9k_int sc_imask;
-	enum wireless_mode sc_curmode;
 	enum PROT_MODE sc_protmode;
 
 	u8 sc_nbcnvaps;

drivers/net/wireless/ath9k/main.c

@@ -60,7 +60,8 @@ static void bus_read_cachesize(struct ath_softc *sc, int *csz)
 
 static void ath_setcurmode(struct ath_softc *sc, enum wireless_mode mode)
 {
-	sc->sc_curmode = mode;
+	if (!sc->sc_curaid)
+		sc->cur_rate_table = sc->hw_rate_table[mode];
 	/*
 	 * All protection frames are transmited at 2Mb/s for
 	 * 11g, otherwise at 1Mb/s.

drivers/net/wireless/ath9k/rc.c

@@ -874,9 +874,8 @@ static void ath_rc_ratefind(struct ath_softc *sc,
 	 * So, set fourth rate in series to be same as third one for
 	 * above conditions.
 	 */
-	if ((sc->sc_curmode == ATH9K_MODE_11NG_HT20) ||
-	    (sc->sc_curmode == ATH9K_MODE_11NG_HT40PLUS) ||
-	    (sc->sc_curmode == ATH9K_MODE_11NG_HT40MINUS)) {
+	if ((sc->hw->conf.channel->band == IEEE80211_BAND_2GHZ) &&
+	    (sc->hw->conf.ht.enabled)) {
 		u8 dot11rate = rate_table->info[rix].dot11rate;
 		u8 phy = rate_table->info[rix].phy;
 		if (i == 4 &&
@@ -1354,8 +1353,8 @@ static void ath_rc_init(struct ath_softc *sc,
 						   sta->ht_cap.ht_supported,
 						   is_cw_40);
 	} else if (sc->sc_ah->ah_opmode == NL80211_IFTYPE_AP) {
-		/* sc_curmode would be set on init through config() */
-		rate_table = sc->hw_rate_table[sc->sc_curmode];
+		/* cur_rate_table would be set on init through config() */
+		rate_table = sc->cur_rate_table;
 	}
 
 	if (!rate_table) {

drivers/net/wireless/ath9k/recv.c

@@ -148,7 +148,7 @@ static int ath_rx_prepare(struct sk_buff *skb, struct ath_desc *ds,
 			  struct ieee80211_rx_status *rx_status, bool *decrypt_error,
 			  struct ath_softc *sc)
 {
-	struct ath_rate_table *rate_table = sc->hw_rate_table[sc->sc_curmode];
+	struct ath_rate_table *rate_table = sc->cur_rate_table;
 	struct ieee80211_hdr *hdr;
 	int ratekbps, rix;
 	u8 ratecode;

drivers/net/wireless/ath9k/xmit.c

@@ -493,7 +493,7 @@ static void ath_tx_update_baw(struct ath_softc *sc, struct ath_atx_tid *tid,
 static u32 ath_pkt_duration(struct ath_softc *sc, u8 rix, struct ath_buf *bf,
 			    int width, int half_gi, bool shortPreamble)
 {
-	struct ath_rate_table *rate_table = sc->hw_rate_table[sc->sc_curmode];
+	struct ath_rate_table *rate_table = sc->cur_rate_table;
 	u32 nbits, nsymbits, duration, nsymbols;
 	u8 rc;
 	int streams, pktlen;
@@ -557,7 +557,7 @@ static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf)
 	}
 
 	/* get the cix for the lowest valid rix */
-	rt = sc->hw_rate_table[sc->sc_curmode];
+	rt = sc->cur_rate_table;
 	for (i = 3; i >= 0; i--) {
 		if (rates[i].count && (rates[i].idx >= 0)) {
 			rix = rates[i].idx;
@@ -1240,7 +1240,7 @@ static u32 ath_lookup_rate(struct ath_softc *sc,
 			   struct ath_buf *bf,
 			   struct ath_atx_tid *tid)
 {
-	struct ath_rate_table *rate_table = sc->hw_rate_table[sc->sc_curmode];
+	struct ath_rate_table *rate_table = sc->cur_rate_table;
 	struct sk_buff *skb;
 	struct ieee80211_tx_info *tx_info;
 	struct ieee80211_tx_rate *rates;
@@ -1308,7 +1308,7 @@ static int ath_compute_num_delims(struct ath_softc *sc,
 				  struct ath_buf *bf,
 				  u16 frmlen)
 {
-	struct ath_rate_table *rt = sc->hw_rate_table[sc->sc_curmode];
+	struct ath_rate_table *rt = sc->cur_rate_table;
 	struct sk_buff *skb = bf->bf_mpdu;
 	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 	u32 nsymbits, nsymbols, mpdudensity;