staging: vt6655: don't stop TX queue unless buffer full.

Presently the TX buffer stops while filling the buffer.

However, this does not make use of the available buffer
space, it also lags the speed of the TX troughtput.

Only stop the queue when the buffer becomes full. The
Interupt handler will start the queue again when a
buffer is available.
Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6655/device_main.c

@@ -1105,6 +1105,7 @@ static int vnt_tx_packet(struct vnt_private *priv, struct sk_buff *skb)
 
 	if (AVAIL_TD(priv, dma_idx) < 1) {
 		spin_unlock_irqrestore(&priv->lock, flags);
+		ieee80211_stop_queues(priv->hw);
 		return -ENOMEM;
 	}
 
@@ -1156,13 +1157,8 @@ static void vnt_tx_80211(struct ieee80211_hw *hw,
 {
 	struct vnt_private *priv = hw->priv;
 
-	ieee80211_stop_queues(hw);
-
-	if (vnt_tx_packet(priv, skb)) {
+	if (vnt_tx_packet(priv, skb))
 		ieee80211_free_txskb(hw, skb);
-
-		ieee80211_wake_queues(hw);
-	}
 }
 
 static int vnt_start(struct ieee80211_hw *hw)