netxen: Fix interrupt handling for multiport adapters

This patch fixes masking of interrupts on multiport adapters. Also disables
interrupts upon ifdown interface. The wrong mask could result in interrupt
flood after interface is down.

Signed-off-by: Dhananjay Phadke <dhananjay@netxen.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/netxen/netxen_nic_main.c

@@ -930,6 +930,8 @@ static int netxen_nic_close(struct net_device *netdev)
 	netif_carrier_off(netdev);
 	netif_stop_queue(netdev);
 
+	netxen_nic_disable_int(adapter);
+
 	cmd_buff = adapter->cmd_buf_arr;
 	for (i = 0; i < adapter->max_tx_desc_count; i++) {
 		buffrag = cmd_buff->frag_array;
@@ -1243,28 +1245,12 @@ static int
 netxen_handle_int(struct netxen_adapter *adapter, struct net_device *netdev)
 {
 	u32 ret = 0;
-	u32 our_int = 0;
 
 	DPRINTK(INFO, "Entered handle ISR\n");
 	adapter->stats.ints++;
 
-	if (!(adapter->flags & NETXEN_NIC_MSI_ENABLED)) {
-		our_int = readl(NETXEN_CRB_NORMALIZE(adapter, CRB_INT_VECTOR));
-		/* not our interrupt */
-		if ((our_int & (0x80 << adapter->portnum)) == 0)
-			return ret;
-	}
-
 	netxen_nic_disable_int(adapter);
 
-	if (adapter->intr_scheme == INTR_SCHEME_PERPORT) {
-		/* claim interrupt */
-		if (!(adapter->flags & NETXEN_NIC_MSI_ENABLED)) {
-			writel(our_int & ~((u32)(0x80 << adapter->portnum)),
-			NETXEN_CRB_NORMALIZE(adapter, CRB_INT_VECTOR));
-		}
-	}
-
 	if (netxen_nic_rx_has_work(adapter) || netxen_nic_tx_has_work(adapter)) {
 		if (netif_rx_schedule_prep(netdev)) {
 			/*
@@ -1298,14 +1284,30 @@ irqreturn_t netxen_intr(int irq, void *data)
 {
 	struct netxen_adapter *adapter;
 	struct net_device *netdev;
+	u32 our_int = 0;
 
 	if (unlikely(!irq)) {
 		return IRQ_NONE;	/* Not our interrupt */
 	}
 
 	adapter = (struct netxen_adapter *)data;
 	netdev  = adapter->netdev;
-	/* process our status queue (for all 4 ports) */
+
+	if (!(adapter->flags & NETXEN_NIC_MSI_ENABLED)) {
+		our_int = readl(NETXEN_CRB_NORMALIZE(adapter, CRB_INT_VECTOR));
+		/* not our interrupt */
+		if ((our_int & (0x80 << adapter->portnum)) == 0)
+			return IRQ_NONE;
+	}
+
+	if (adapter->intr_scheme == INTR_SCHEME_PERPORT) {
+		/* claim interrupt */
+		if (!(adapter->flags & NETXEN_NIC_MSI_ENABLED)) {
+			writel(our_int & ~((u32)(0x80 << adapter->portnum)),
+			NETXEN_CRB_NORMALIZE(adapter, CRB_INT_VECTOR));
+		}
+	}
+
 	if (netif_running(netdev))
 		netxen_handle_int(adapter, netdev);