ath9k: Fix MCS rates registration bug for AR9285

AR9285 based devices support only single stream MCS rates.
This patch fixes a bug where dual stream stream rates were
also being registered.

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 18 insertions, 5 deletions

diff --git a/drivers/net/wireless/ath9k/main.c b/drivers/net/wireless/ath9k/main.c
index 561a2c3adbbe..15a7f90bc84b 100644
--- a/drivers/net/wireless/ath9k/main.c
+++ b/drivers/net/wireless/ath9k/main.c
@@ -854,7 +854,8 @@ static void ath_key_delete(struct ath_softc *sc, struct ieee80211_key_conf *key)
         }
 }
 
-static void setup_ht_cap(struct ieee80211_sta_ht_cap *ht_info)
+static void setup_ht_cap(struct ath_softc *sc,
+                         struct ieee80211_sta_ht_cap *ht_info)
 {
 #define ATH9K_HT_CAP_MAXRXAMPDU_65536 0x3       /* 2 ^ 16 */
 #define ATH9K_HT_CAP_MPDUDENSITY_8 0x6          /* 8 usec */
@@ -867,10 +868,22 @@ static void setup_ht_cap(struct ieee80211_sta_ht_cap *ht_info)
 
         ht_info->ampdu_factor = ATH9K_HT_CAP_MAXRXAMPDU_65536;
         ht_info->ampdu_density = ATH9K_HT_CAP_MPDUDENSITY_8;
+
         /* set up supported mcs set */
         memset(&ht_info->mcs, 0, sizeof(ht_info->mcs));
-        ht_info->mcs.rx_mask[0] = 0xff;
-        ht_info->mcs.rx_mask[1] = 0xff;
+
+        switch(sc->sc_rx_chainmask) {
+        case 1:
+                ht_info->mcs.rx_mask[0] = 0xff;
+                break;
+        case 5:
+        case 7:
+        default:
+                ht_info->mcs.rx_mask[0] = 0xff;
+                ht_info->mcs.rx_mask[1] = 0xff;
+                break;
+        }
+
         ht_info->mcs.tx_params = IEEE80211_HT_MCS_TX_DEFINED;
 }
 
@@ -1549,9 +1562,9 @@ int ath_attach(u16 devid, struct ath_softc *sc)
         hw->rate_control_algorithm = "ath9k_rate_control";
 
         if (sc->sc_ah->ah_caps.hw_caps & ATH9K_HW_CAP_HT) {
-                setup_ht_cap(&sc->sbands[IEEE80211_BAND_2GHZ].ht_cap);
+                setup_ht_cap(sc, &sc->sbands[IEEE80211_BAND_2GHZ].ht_cap);
                 if (test_bit(ATH9K_MODE_11A, sc->sc_ah->ah_caps.wireless_modes))
-                        setup_ht_cap(&sc->sbands[IEEE80211_BAND_5GHZ].ht_cap);
+                        setup_ht_cap(sc, &sc->sbands[IEEE80211_BAND_5GHZ].ht_cap);
         }
 
         hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &sc->sbands[IEEE80211_BAND_2GHZ];