mac80211: stop tx before doing hw config and rate update

[pandora-kernel.git] / net / mac80211 / mlme.c

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index fb2f0f9..ca97b80 100644 (file)
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -1918,8 +1918,24 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
 
                rcu_read_unlock();
 
+               /*
+                * Whenever the AP announces the HT mode change that can be
+                * 40MHz intolerant or etc., it would be safer to stop tx
+                * queues before doing hw config to avoid buffer overflow.
+                */
+               ieee80211_stop_queues_by_reason(&sdata->local->hw,
+                               IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE);
+
+               /* flush out all packets */
+               synchronize_net();
+
+               drv_flush(local, false);
+
                changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
                                               bssid, ap_ht_cap_flags);
+
+               ieee80211_wake_queues_by_reason(&sdata->local->hw,
+                               IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE);
        }
 
        /* Note: country IE parsing is done for us by cfg80211 */