ath5k: implement ieee80211_ops->{get,set}_ringparam

set_ringparam only allows changes to tx ring at this time.

Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath5k/base.c b/drivers/net/wireless/ath/ath5k/base.c
index e6ff62e..4d7f21e 100644
--- a/drivers/net/wireless/ath/ath5k/base.c
+++ b/drivers/net/wireless/ath/ath5k/base.c
@@ -943,6 +943,7 @@
 		spin_lock_init(&txq->lock);
 		txq->setup = true;
 		txq->txq_len = 0;
+		txq->txq_max = ATH5K_TXQ_LEN_MAX;
 		txq->txq_poll_mark = false;
 		txq->txq_stuck = 0;
 	}
@@ -1534,7 +1535,7 @@
 		goto drop_packet;
 	}
 
-	if (txq->txq_len >= ATH5K_TXQ_LEN_MAX)
+	if (txq->txq_len >= txq->txq_max)
 		ieee80211_stop_queue(hw, txq->qnum);
 
 	spin_lock_irqsave(&sc->txbuflock, flags);