forcedeth: save irq events for napi processing

This patch will save the irq events in the driver's context so that the
napi routine knows which interrupts have occurred. Subsequent changes
will be moving all interrupt processing into the napi poll routine.

Signed-off-by: Ayaz Abdulla <aabdulla@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/forcedeth.c

@@ -759,6 +759,7 @@ struct fe_priv {
 	dma_addr_t ring_addr;
 	struct pci_dev *pci_dev;
 	u32 orig_mac[2];
+	u32 events;
 	u32 irqmask;
 	u32 desc_ver;
 	u32 txrxctl_bits;
@@ -3417,21 +3418,20 @@ static irqreturn_t nv_nic_irq(int foo, void *data)
 	struct net_device *dev = (struct net_device *) data;
 	struct fe_priv *np = netdev_priv(dev);
 	u8 __iomem *base = get_hwbase(dev);
-	u32 events;
 	int i;
 
 	dprintk(KERN_DEBUG "%s: nv_nic_irq\n", dev->name);
 
 	for (i=0; ; i++) {
 		if (!(np->msi_flags & NV_MSI_X_ENABLED)) {
-			events = readl(base + NvRegIrqStatus) & NVREG_IRQSTAT_MASK;
+			np->events = readl(base + NvRegIrqStatus) & NVREG_IRQSTAT_MASK;
 			writel(NVREG_IRQSTAT_MASK, base + NvRegIrqStatus);
 		} else {
-			events = readl(base + NvRegMSIXIrqStatus) & NVREG_IRQSTAT_MASK;
+			np->events = readl(base + NvRegMSIXIrqStatus) & NVREG_IRQSTAT_MASK;
 			writel(NVREG_IRQSTAT_MASK, base + NvRegMSIXIrqStatus);
 		}
-		dprintk(KERN_DEBUG "%s: irq: %08x\n", dev->name, events);
-		if (!(events & np->irqmask))
+		dprintk(KERN_DEBUG "%s: irq: %08x\n", dev->name, np->events);
+		if (!(np->events & np->irqmask))
 			break;
 
 		nv_msi_workaround(np);
@@ -3441,7 +3441,7 @@ static irqreturn_t nv_nic_irq(int foo, void *data)
 		spin_unlock(&np->lock);
 
 #ifdef CONFIG_FORCEDETH_NAPI
-		if (events & NVREG_IRQ_RX_ALL) {
+		if (np->events & NVREG_IRQ_RX_ALL) {
 			spin_lock(&np->lock);
 			napi_schedule(&np->napi);
 
@@ -3464,7 +3464,7 @@ static irqreturn_t nv_nic_irq(int foo, void *data)
 			}
 		}
 #endif
-		if (unlikely(events & NVREG_IRQ_LINK)) {
+		if (unlikely(np->events & NVREG_IRQ_LINK)) {
 			spin_lock(&np->lock);
 			nv_link_irq(dev);
 			spin_unlock(&np->lock);
@@ -3475,15 +3475,15 @@ static irqreturn_t nv_nic_irq(int foo, void *data)
 			spin_unlock(&np->lock);
 			np->link_timeout = jiffies + LINK_TIMEOUT;
 		}
-		if (unlikely(events & (NVREG_IRQ_TX_ERR))) {
+		if (unlikely(np->events & (NVREG_IRQ_TX_ERR))) {
 			dprintk(KERN_DEBUG "%s: received irq with events 0x%x. Probably TX fail.\n",
-						dev->name, events);
+						dev->name, np->events);
 		}
-		if (unlikely(events & (NVREG_IRQ_UNKNOWN))) {
+		if (unlikely(np->events & (NVREG_IRQ_UNKNOWN))) {
 			printk(KERN_DEBUG "%s: received irq with unknown events 0x%x. Please report\n",
-						dev->name, events);
+						dev->name, np->events);
 		}
-		if (unlikely(events & NVREG_IRQ_RECOVER_ERROR)) {
+		if (unlikely(np->events & NVREG_IRQ_RECOVER_ERROR)) {
 			spin_lock(&np->lock);
 			/* disable interrupts on the nic */
 			if (!(np->msi_flags & NV_MSI_X_ENABLED))
@@ -3534,21 +3534,20 @@ static irqreturn_t nv_nic_irq_optimized(int foo, void *data)
 	struct net_device *dev = (struct net_device *) data;
 	struct fe_priv *np = netdev_priv(dev);
 	u8 __iomem *base = get_hwbase(dev);
-	u32 events;
 	int i;
 
 	dprintk(KERN_DEBUG "%s: nv_nic_irq_optimized\n", dev->name);
 
 	for (i=0; ; i++) {
 		if (!(np->msi_flags & NV_MSI_X_ENABLED)) {
-			events = readl(base + NvRegIrqStatus) & NVREG_IRQSTAT_MASK;
+			np->events = readl(base + NvRegIrqStatus) & NVREG_IRQSTAT_MASK;
 			writel(NVREG_IRQSTAT_MASK, base + NvRegIrqStatus);
 		} else {
-			events = readl(base + NvRegMSIXIrqStatus) & NVREG_IRQSTAT_MASK;
+			np->events = readl(base + NvRegMSIXIrqStatus) & NVREG_IRQSTAT_MASK;
 			writel(NVREG_IRQSTAT_MASK, base + NvRegMSIXIrqStatus);
 		}
-		dprintk(KERN_DEBUG "%s: irq: %08x\n", dev->name, events);
-		if (!(events & np->irqmask))
+		dprintk(KERN_DEBUG "%s: irq: %08x\n", dev->name, np->events);
+		if (!(np->events & np->irqmask))
 			break;
 
 		nv_msi_workaround(np);
@@ -3558,7 +3557,7 @@ static irqreturn_t nv_nic_irq_optimized(int foo, void *data)
 		spin_unlock(&np->lock);
 
 #ifdef CONFIG_FORCEDETH_NAPI
-		if (events & NVREG_IRQ_RX_ALL) {
+		if (np->events & NVREG_IRQ_RX_ALL) {
 			spin_lock(&np->lock);
 			napi_schedule(&np->napi);
 
@@ -3581,7 +3580,7 @@ static irqreturn_t nv_nic_irq_optimized(int foo, void *data)
 			}
 		}
 #endif
-		if (unlikely(events & NVREG_IRQ_LINK)) {
+		if (unlikely(np->events & NVREG_IRQ_LINK)) {
 			spin_lock(&np->lock);
 			nv_link_irq(dev);
 			spin_unlock(&np->lock);
@@ -3592,15 +3591,15 @@ static irqreturn_t nv_nic_irq_optimized(int foo, void *data)
 			spin_unlock(&np->lock);
 			np->link_timeout = jiffies + LINK_TIMEOUT;
 		}
-		if (unlikely(events & (NVREG_IRQ_TX_ERR))) {
+		if (unlikely(np->events & (NVREG_IRQ_TX_ERR))) {
 			dprintk(KERN_DEBUG "%s: received irq with events 0x%x. Probably TX fail.\n",
-						dev->name, events);
+						dev->name, np->events);
 		}
-		if (unlikely(events & (NVREG_IRQ_UNKNOWN))) {
+		if (unlikely(np->events & (NVREG_IRQ_UNKNOWN))) {
 			printk(KERN_DEBUG "%s: received irq with unknown events 0x%x. Please report\n",
-						dev->name, events);
+						dev->name, np->events);
 		}
-		if (unlikely(events & NVREG_IRQ_RECOVER_ERROR)) {
+		if (unlikely(np->events & NVREG_IRQ_RECOVER_ERROR)) {
 			spin_lock(&np->lock);
 			/* disable interrupts on the nic */
 			if (!(np->msi_flags & NV_MSI_X_ENABLED))