ath9k: Determine number of streams from HT capabilities

The number of streams supported by a STA can be determined
directly from the HT capabilities. Remove the redundant
variable storing the stream cap.
Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath9k/rc.c

@@ -524,7 +524,7 @@ static u8 ath_rc_init_validrates(struct ath_rate_priv *ath_rc_priv,
 	u32 valid;
 
 	for (i = 0; i < rate_table->rate_cnt; i++) {
-		valid = (ath_rc_priv->single_stream ?
+		valid = (!(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG) ?
 			 rate_table->info[i].valid_single_stream :
 			 rate_table->info[i].valid);
 		if (valid == 1) {
@@ -557,7 +557,7 @@ static u8 ath_rc_setvalid_rates(struct ath_rate_priv *ath_rc_priv,
 	for (i = 0; i < rateset->rs_nrates; i++) {
 		for (j = 0; j < rate_table->rate_cnt; j++) {
 			u32 phy = rate_table->info[j].phy;
-			u32 valid = (ath_rc_priv->single_stream ?
+			u32 valid = (!(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG) ?
 				     rate_table->info[j].valid_single_stream :
 				     rate_table->info[j].valid);
 			u8 rate = rateset->rs_rates[i];
@@ -603,7 +603,7 @@ static u8 ath_rc_setvalid_htrates(struct ath_rate_priv *ath_rc_priv,
 	for (i = 0; i < rateset->rs_nrates; i++) {
 		for (j = 0; j < rate_table->rate_cnt; j++) {
 			u32 phy = rate_table->info[j].phy;
-			u32 valid = (ath_rc_priv->single_stream ?
+			u32 valid = (!(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG) ?
 				     rate_table->info[j].valid_single_stream :
 				     rate_table->info[j].valid);
 			u8 rate = rateset->rs_rates[i];
@@ -740,9 +740,10 @@ static u8 ath_rc_ratefind_ht(struct ath_softc *sc,
 	if (rate > (ath_rc_priv->rate_table_size - 1))
 		rate = ath_rc_priv->rate_table_size - 1;
 
-	ASSERT((rate_table->info[rate].valid && !ath_rc_priv->single_stream) ||
+	ASSERT((rate_table->info[rate].valid &&
+		(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG)) ||
 	       (rate_table->info[rate].valid_single_stream &&
-		ath_rc_priv->single_stream));
+		!(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG)));
 
 	return rate;
 }
@@ -1422,9 +1423,6 @@ static void ath_rc_init(struct ath_softc *sc,
 	}
 	ath_rc_priv->rc_phy_mode = ath_rc_priv->ht_cap & WLAN_RC_40_FLAG;
 
-	/* Set stream capability */
-	ath_rc_priv->single_stream = (ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG) ? 0 : 1;
-
 	if (!rateset->rs_nrates) {
 		/* No working rate, just initialize valid rates */
 		hi = ath_rc_init_validrates(ath_rc_priv, rate_table,

drivers/net/wireless/ath9k/rc.h

@@ -157,7 +157,6 @@ struct ath_rateset {
  * @probe_interval: interval for ratectrl to probe for other rates
  * @prev_data_rix: rate idx of last data frame
  * @ht_cap: HT capabilities
- * @single_stream: When TRUE, only single TX stream possible
  * @neg_rates: Negotatied rates
  * @neg_ht_rates: Negotiated HT rates
  */
@@ -175,7 +174,6 @@ struct ath_rate_priv {
 	u8 max_valid_rate;
 	u8 valid_rate_index[RATE_TABLE_SIZE];
 	u8 ht_cap;
-	u8 single_stream;
 	u8 valid_phy_ratecnt[WLAN_RC_PHY_MAX];
 	u8 valid_phy_rateidx[WLAN_RC_PHY_MAX][RATE_TABLE_SIZE];
 	u8 rc_phy_mode;