1 files changed, 49 insertions, 27 deletions

diff --git a/drivers/net/ethoc.c b/drivers/net/ethoc.c
index a12a07e..43431ff 100644
--- a/drivers/net/ethoc.c
+++ b/drivers/net/ethoc.c
@@ -495,29 +495,42 @@ static int ethoc_update_tx_stats(struct ethoc *dev, struct ethoc_bd *bd)
 	return 0;
 }
 
-static void ethoc_tx(struct net_device *dev)
+static int ethoc_tx(struct net_device *dev, int limit)
 {
 	struct ethoc *priv = netdev_priv(dev);
+	int count;
+	struct ethoc_bd bd;
 
-	spin_lock(&priv->lock);
+	for (count = 0; count < limit; ++count) {
+		unsigned int entry;
 
-	while (priv->dty_tx != priv->cur_tx) {
-		unsigned int entry = priv->dty_tx % priv->num_tx;
-		struct ethoc_bd bd;
+		entry = priv->dty_tx % priv->num_tx;
 
 		ethoc_read_bd(priv, entry, &bd);
-		if (bd.stat & TX_BD_READY)
-			break;
 
-		entry = (++priv->dty_tx) % priv->num_tx;
+		if (bd.stat & TX_BD_READY || (priv->dty_tx == priv->cur_tx)) {
+			ethoc_ack_irq(priv, INT_MASK_TX);
+			/* If interrupt came in between reading in the BD
+			 * and clearing the interrupt source, then we risk
+			 * missing the event as the TX interrupt won't trigger
+			 * right away when we reenable it; hence, check
+			 * BD_EMPTY here again to make sure there isn't such an
+			 * event pending...
+			 */
+			ethoc_read_bd(priv, entry, &bd);
+			if (bd.stat & TX_BD_READY ||
+			    (priv->dty_tx == priv->cur_tx))
+				break;
+		}
+
 		(void)ethoc_update_tx_stats(priv, &bd);
+		priv->dty_tx++;
 	}
 
 	if ((priv->cur_tx - priv->dty_tx) <= (priv->num_tx / 2))
 		netif_wake_queue(dev);
 
-	ethoc_ack_irq(priv, INT_MASK_TX);
-	spin_unlock(&priv->lock);
+	return count;
 }
 
 static irqreturn_t ethoc_interrupt(int irq, void *dev_id)
@@ -525,32 +538,38 @@ static irqreturn_t ethoc_interrupt(int irq, void *dev_id)
 	struct net_device *dev = dev_id;
 	struct ethoc *priv = netdev_priv(dev);
 	u32 pending;
-
-	ethoc_disable_irq(priv, INT_MASK_ALL);
+	u32 mask;
+
+	/* Figure out what triggered the interrupt...
+	 * The tricky bit here is that the interrupt source bits get
+	 * set in INT_SOURCE for an event irregardless of whether that
+	 * event is masked or not.  Thus, in order to figure out what
+	 * triggered the interrupt, we need to remove the sources
+	 * for all events that are currently masked.  This behaviour
+	 * is not particularly well documented but reasonable...
+	 */
+	mask = ethoc_read(priv, INT_MASK);
 	pending = ethoc_read(priv, INT_SOURCE);
+	pending &= mask;
+
 	if (unlikely(pending == 0)) {
-		ethoc_enable_irq(priv, INT_MASK_ALL);
 		return IRQ_NONE;
 	}
 
 	ethoc_ack_irq(priv, pending);
 
+	/* We always handle the dropped packet interrupt */
 	if (pending & INT_MASK_BUSY) {
 		dev_err(&dev->dev, "packet dropped\n");
 		dev->stats.rx_dropped++;
 	}
 
-	if (pending & INT_MASK_RX) {
-		if (napi_schedule_prep(&priv->napi))
-			__napi_schedule(&priv->napi);
-	} else {
-		ethoc_enable_irq(priv, INT_MASK_RX);
+	/* Handle receive/transmit event by switching to polling */
+	if (pending & (INT_MASK_TX | INT_MASK_RX)) {
+		ethoc_disable_irq(priv, INT_MASK_TX | INT_MASK_RX);
+		napi_schedule(&priv->napi);
 	}
 
-	if (pending & INT_MASK_TX)
-		ethoc_tx(dev);
-
-	ethoc_enable_irq(priv, INT_MASK_ALL & ~INT_MASK_RX);
 	return IRQ_HANDLED;
 }
 
@@ -576,15 +595,18 @@ static int ethoc_get_mac_address(struct net_device *dev, void *addr)
 static int ethoc_poll(struct napi_struct *napi, int budget)
 {
 	struct ethoc *priv = container_of(napi, struct ethoc, napi);
-	int work_done = 0;
+	int rx_work_done = 0;
+	int tx_work_done = 0;
+
+	rx_work_done = ethoc_rx(priv->netdev, budget);
+	tx_work_done = ethoc_tx(priv->netdev, budget);
 
-	work_done = ethoc_rx(priv->netdev, budget);
-	if (work_done < budget) {
+	if (rx_work_done < budget && tx_work_done < budget) {
 		napi_complete(napi);
-		ethoc_enable_irq(priv, INT_MASK_RX);
+		ethoc_enable_irq(priv, INT_MASK_TX | INT_MASK_RX);
 	}
 
-	return work_done;
+	return rx_work_done;
 }
 
 static int ethoc_mdio_read(struct mii_bus *bus, int phy, int reg)