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>
 
        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);
 
        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;
 
 
        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");