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>

2 files changed, 8 insertions, 12 deletions

diff --git a/drivers/net/wireless/ath9k/rc.c b/drivers/net/wireless/ath9k/rc.c
index 824ccbb8b7b8..a6933ccab483 100644
--- a/drivers/net/wireless/ath9k/rc.c
+++ b/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) {
@@ -557,9 +557,9 @@ 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 ?
-                                rate_table->info[j].valid_single_stream :
-                                rate_table->info[j].valid);
+                        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];
                         u8 dot11rate = rate_table->info[j].dot11rate;
 
@@ -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,
diff --git a/drivers/net/wireless/ath9k/rc.h b/drivers/net/wireless/ath9k/rc.h
index ec72dd29da00..bdfd2052077c 100644
--- a/drivers/net/wireless/ath9k/rc.h
+++ b/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;