iwlwifi: report error when detect failure during stop agg queue

This fix related to bug 1921 at
http://www.intellinuxwireless.org/bugzilla/show_bug.cgi?id=1921

when detect error during stopping tx aggregation queue, report the error to
help identify the problem.
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-5000.c

@@ -1077,7 +1077,7 @@ static int iwl5000_txq_agg_disable(struct iwl_priv *priv, u16 txq_id,
 
 	if ((IWL50_FIRST_AMPDU_QUEUE > txq_id) ||
 	    (IWL50_FIRST_AMPDU_QUEUE + IWL50_NUM_AMPDU_QUEUES <= txq_id)) {
-		IWL_WARN(priv,
+		IWL_ERR(priv,
 			"queue number out of range: %d, must be %d to %d\n",
 			txq_id, IWL50_FIRST_AMPDU_QUEUE,
 			IWL50_FIRST_AMPDU_QUEUE + IWL50_NUM_AMPDU_QUEUES - 1);

drivers/net/wireless/iwlwifi/iwl-sta.c

@@ -1138,8 +1138,10 @@ int iwl_sta_rx_agg_stop(struct iwl_priv *priv, const u8 *addr, int tid)
 	int sta_id;
 
 	sta_id = iwl_find_station(priv, addr);
-	if (sta_id == IWL_INVALID_STATION)
+	if (sta_id == IWL_INVALID_STATION) {
+		IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
 		return -ENXIO;
+	}
 
 	spin_lock_irqsave(&priv->sta_lock, flags);
 	priv->stations[sta_id].sta.station_flags_msk = 0;

drivers/net/wireless/iwlwifi/iwl-tx.c

@@ -1223,8 +1223,10 @@ int iwl_tx_agg_stop(struct iwl_priv *priv , const u8 *ra, u16 tid)
 
 	sta_id = iwl_find_station(priv, ra);
 
-	if (sta_id == IWL_INVALID_STATION)
+	if (sta_id == IWL_INVALID_STATION) {
+		IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
 		return -ENXIO;
+	}
 
 	if (priv->stations[sta_id].tid[tid].agg.state != IWL_AGG_ON)
 		IWL_WARN(priv, "Stopping AGG while state not IWL_AGG_ON\n");