diff --git a/drivers/net/wireless/iwlwifi/iwl3945-base.c b/drivers/net/wireless/iwlwifi/iwl3945-base.c
index 9bf94f0e88a8..5f26c93d3516 100644
--- a/drivers/net/wireless/iwlwifi/iwl3945-base.c
+++ b/drivers/net/wireless/iwlwifi/iwl3945-base.c
@@ -562,6 +562,9 @@ static int iwl3945_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
 	txq = &priv->txq[txq_id];
 	q = &txq->q;
 
+	if ((iwl_queue_space(q) < q->high_mark))
+		goto drop;
+
 	spin_lock_irqsave(&priv->lock, flags);
 
 	idx = get_cmd_index(q, q->write_ptr, 0);