1 files changed, 20 insertions, 18 deletions

diff --git a/drivers/net/natsemi.c b/drivers/net/natsemi.c
index 2888880df3b7..5f88200724e6 100644
--- a/drivers/net/natsemi.c
+++ b/drivers/net/natsemi.c
@@ -2119,28 +2119,35 @@ static irqreturn_t intr_handler(int irq, void *dev_instance)
         struct netdev_private *np = netdev_priv(dev);
         void __iomem * ioaddr = ns_ioaddr(dev);
 
-        if (np->hands_off)
+        /* Reading IntrStatus automatically acknowledges so don't do
+         * that while interrupts are disabled, (for example, while a
+         * poll is scheduled).  */
+        if (np->hands_off || !readl(ioaddr + IntrEnable))
                 return IRQ_NONE;
 
-        /* Reading automatically acknowledges. */
         np->intr_status = readl(ioaddr + IntrStatus);
 
+        if (!np->intr_status)
+                return IRQ_NONE;
+
         if (netif_msg_intr(np))
                 printk(KERN_DEBUG
                        "%s: Interrupt, status %#08x, mask %#08x.\n",
                        dev->name, np->intr_status,
                        readl(ioaddr + IntrMask));
 
-        if (!np->intr_status)
-                return IRQ_NONE;
-
         prefetch(&np->rx_skbuff[np->cur_rx % RX_RING_SIZE]);
 
         if (netif_rx_schedule_prep(dev)) {
                 /* Disable interrupts and register for poll */
                 natsemi_irq_disable(dev);
                 __netif_rx_schedule(dev);
-        }
+        } else
+                printk(KERN_WARNING
+                       "%s: Ignoring interrupt, status %#08x, mask %#08x.\n",
+                       dev->name, np->intr_status,
+                       readl(ioaddr + IntrMask));
+
         return IRQ_HANDLED;
 }
 
@@ -2156,6 +2163,12 @@ static int natsemi_poll(struct net_device *dev, int *budget)
         int work_done = 0;
 
         do {
+                if (netif_msg_intr(np))
+                        printk(KERN_DEBUG
+                               "%s: Poll, status %#08x, mask %#08x.\n",
+                               dev->name, np->intr_status,
+                               readl(ioaddr + IntrMask));
+
                 if (np->intr_status &
                     (IntrTxDone | IntrTxIntr | IntrTxIdle | IntrTxErr)) {
                         spin_lock(&np->lock);
@@ -2399,19 +2412,8 @@ static struct net_device_stats *get_stats(struct net_device *dev)
 #ifdef CONFIG_NET_POLL_CONTROLLER
 static void natsemi_poll_controller(struct net_device *dev)
 {
-        struct netdev_private *np = netdev_priv(dev);
-
         disable_irq(dev->irq);
-
-        /*
-         * A real interrupt might have already reached us at this point
-         * but NAPI might still haven't called us back.  As the interrupt
-         * status register is cleared by reading, we should prevent an
-         * interrupt loss in this case...
-         */
-        if (!np->intr_status)
-                intr_handler(dev->irq, dev);
-
+        intr_handler(dev->irq, dev);
         enable_irq(dev->irq);
 }
 #endif