iwlwifi: remove un-necessary rs_tl_turn_on_agg() after agg enabled

After the MLME handshaking complete and tx aggregation started for the
tid. Do not send unnecessary turn on aggregation request to mac80211.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-agn-rs.c

@@ -1700,6 +1700,7 @@ static void rs_rate_scale_perform(struct iwl_priv *priv,
 	u16 high_low;
 	s32 sr;
 	u8 tid = MAX_TID_COUNT;
+	struct iwl_tid_data *tid_data;
 
 	IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
 
@@ -2035,8 +2036,15 @@ static void rs_rate_scale_perform(struct iwl_priv *priv,
 			if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
 			    (lq_sta->tx_agg_tid_en & (1 << tid)) &&
 			    (tid != MAX_TID_COUNT)) {
-				IWL_DEBUG_RATE(priv, "try to aggregate tid %d\n", tid);
-				rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
+				tid_data =
+				   &priv->stations[lq_sta->lq.sta_id].tid[tid];
+				if (tid_data->agg.state == IWL_AGG_OFF) {
+					IWL_DEBUG_RATE(priv,
+						       "try to aggregate tid %d\n",
+						       tid);
+					rs_tl_turn_on_agg(priv, tid,
+							  lq_sta, sta);
+				}
 			}
 			lq_sta->action_counter = 0;
 			rs_set_stay_in_table(priv, 0, lq_sta);