libertas: kill TxLockFlag

We don't need this. We can use adapter->currenttxskb instead.
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/libertas/dev.h

@@ -285,7 +285,6 @@ struct lbs_adapter {
 
 	/** Tx-related variables (for single packet tx) */
 	struct sk_buff *currenttxskb;
-	u16 TxLockFlag;
 
 	/** NIC Operation characteristics */
 	u16 currentpacketfilter;

drivers/net/wireless/libertas/main.c

@@ -290,8 +290,14 @@ static ssize_t lbs_rtap_set(struct device *dev,
 			return strlen(buf);
 		adapter->monitormode = LBS_MONITOR_OFF;
 		lbs_remove_rtap(priv);
-		netif_wake_queue(priv->dev);
-		netif_wake_queue(priv->mesh_dev);
+
+		if (adapter->currenttxskb) {
+			dev_kfree_skb_any(adapter->currenttxskb);
+			adapter->currenttxskb = NULL;
+		}
+
+		/* Wake queues, command thread, etc. */
+		lbs_host_to_card_done(priv);
 	}
 
 	lbs_prepare_and_send_command(priv,
@@ -521,7 +527,15 @@ static int lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 
 	lbs_deb_enter(LBS_DEB_TX);
 
-	if (priv->dnld_sent || priv->adapter->TxLockFlag) {
+	/* We could return NETDEV_TX_BUSY here, but I'd actually 
+	   like to get the point where we can BUG() */
+	if (priv->dnld_sent) {
+		lbs_pr_err("%s while dnld_sent\n", __func__);
+		priv->stats.tx_dropped++;
+		goto done;
+	}
+	if (priv->adapter->currenttxskb) {
+		lbs_pr_err("%s while TX skb pending\n", __func__);
 		priv->stats.tx_dropped++;
 		goto done;
 	}
@@ -624,6 +638,11 @@ void lbs_host_to_card_done(struct lbs_private *priv)
 	if (!adapter->cur_cmd)
 		wake_up_interruptible(&priv->waitq);
 
+	/* Don't wake netif queues if we're in monitor mode and
+	   a TX packet is already pending. */
+	if (priv->adapter->currenttxskb)
+		return;
+
 	if (priv->dev && adapter->connect_status == LBS_CONNECTED)
 		netif_wake_queue(priv->dev);
 

drivers/net/wireless/libertas/tx.c

@@ -152,11 +152,11 @@ static int SendSinglePacket(struct lbs_private *priv, struct sk_buff *skb)
 		netif_stop_queue(priv->dev);
 		if (priv->mesh_dev)
 			netif_stop_queue(priv->mesh_dev);
-		/* freeze any packets already in our queues */
-		priv->adapter->TxLockFlag = 1;
+
+		/* Keep the skb around for when we get feedback */
+		priv->adapter->currenttxskb = skb;
 	} else {
 		dev_kfree_skb_any(skb);
-		priv->adapter->currenttxskb = NULL;
 	}
 
 	lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret);
@@ -227,8 +227,6 @@ int lbs_process_tx(struct lbs_private *priv, struct sk_buff *skb)
 		return ret;
 	}
 
-	priv->adapter->currenttxskb = skb;
-
 	ret = SendSinglePacket(priv, skb);
 done:
 	lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret);
@@ -272,7 +270,6 @@ void lbs_send_tx_feedback(struct lbs_private *priv)
 	    (1 + adapter->txretrycount - try_count) : 0;
 	lbs_upload_rx_packet(priv, adapter->currenttxskb);
 	adapter->currenttxskb = NULL;
-	priv->adapter->TxLockFlag = 0;
 
 	if (adapter->connect_status == LBS_CONNECTED)
 		netif_wake_queue(priv->dev);