mac80211: Fix HT rate control configuration

Handling HT configuration changes involved setting the channel
with the new HT parameters and then issuing a rate_update()
notification to the driver.

This behavior changed after the off-channel changes. Now, the channel
is not updated with the new HT params in enable_ht() - instead, it
is now done when the scan work terminates. This results in the driver
depending on stale information, defaulting to non-HT mode always.

Fix this by passing the new channel type to the driver.

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

4 files changed, 10 insertions, 7 deletions

diff --git a/drivers/net/wireless/ath/ath9k/rc.c b/drivers/net/wireless/ath/ath9k/rc.c
index ac34a055c713..0e79e58cf4c9 100644
--- a/drivers/net/wireless/ath/ath9k/rc.c
+++ b/drivers/net/wireless/ath/ath9k/rc.c
@@ -1323,7 +1323,7 @@ static void ath_rate_init(void *priv, struct ieee80211_supported_band *sband,
 
 static void ath_rate_update(void *priv, struct ieee80211_supported_band *sband,
                             struct ieee80211_sta *sta, void *priv_sta,
-                            u32 changed)
+                            u32 changed, enum nl80211_channel_type oper_chan_type)
 {
         struct ath_softc *sc = priv;
         struct ath_rate_priv *ath_rc_priv = priv_sta;
@@ -1340,8 +1340,8 @@ static void ath_rate_update(void *priv, struct ieee80211_supported_band *sband,
                 if (sc->sc_ah->opmode != NL80211_IFTYPE_STATION)
                         return;
 
-                if (sc->hw->conf.channel_type == NL80211_CHAN_HT40MINUS ||
-                    sc->hw->conf.channel_type == NL80211_CHAN_HT40PLUS)
+                if (oper_chan_type == NL80211_CHAN_HT40MINUS ||
+                    oper_chan_type == NL80211_CHAN_HT40PLUS)
                         oper_cw40 = true;
 
                 oper_sgi40 = (sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40) ?
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 80eb7cc42ce9..45d7d44d7cbe 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -2426,7 +2426,8 @@ struct rate_control_ops {
                           struct ieee80211_sta *sta, void *priv_sta);
         void (*rate_update)(void *priv, struct ieee80211_supported_band *sband,
                             struct ieee80211_sta *sta,
-                            void *priv_sta, u32 changed);
+                            void *priv_sta, u32 changed,
+                            enum nl80211_channel_type oper_chan_type);
         void (*free_sta)(void *priv, struct ieee80211_sta *sta,
                          void *priv_sta);
 
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 5a268761e4c5..0ab284c32135 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -177,7 +177,8 @@ static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
                 sta = sta_info_get(sdata, bssid);
                 if (sta)
                         rate_control_rate_update(local, sband, sta,
-                                                 IEEE80211_RC_HT_CHANGED);
+                                                 IEEE80211_RC_HT_CHANGED,
+                                                 local->oper_channel_type);
                 rcu_read_unlock();
         }
 
diff --git a/net/mac80211/rate.h b/net/mac80211/rate.h
index b6108bca96d4..065a96190e32 100644
--- a/net/mac80211/rate.h
+++ b/net/mac80211/rate.h
@@ -66,7 +66,8 @@ static inline void rate_control_rate_init(struct sta_info *sta)
 
 static inline void rate_control_rate_update(struct ieee80211_local *local,
                                     struct ieee80211_supported_band *sband,
-                                    struct sta_info *sta, u32 changed)
+                                    struct sta_info *sta, u32 changed,
+                                    enum nl80211_channel_type oper_chan_type)
 {
         struct rate_control_ref *ref = local->rate_ctrl;
         struct ieee80211_sta *ista = &sta->sta;
@@ -74,7 +75,7 @@ static inline void rate_control_rate_update(struct ieee80211_local *local,
 
         if (ref && ref->ops->rate_update)
                 ref->ops->rate_update(ref->priv, sband, ista,
-                                      priv_sta, changed);
+                                      priv_sta, changed, oper_chan_type);
 }
 
 static inline void *rate_control_alloc_sta(struct rate_control_ref *ref,