Subject: [PATCH 9/13] forcedeth: remove isr processing loop

From: Ayaz Abdulla <[email-masked]>
Date: Thu, 05 Mar 2009 13:02:22 -0500

This patch is only a subset of changes so that it is easier to see the 
modifications. This patch removes the isr 'for' loop and shifts all the 
logic to account for new tab spacing.

Signed-off-by: Ayaz Abdulla <[email-masked]>

--- old/drivers/net/forcedeth.c	2009-03-05 10:45:40.000000000 -0800
+++ new/drivers/net/forcedeth.c	2009-03-05 10:45:56.000000000 -0800
@@ -3423,99 +3423,78 @@
 	struct net_device *dev = (struct net_device *) data;
 	struct fe_priv *np = netdev_priv(dev);
 	u8 __iomem *base = get_hwbase(dev);
-	int i;
 
 	dprintk(KERN_DEBUG "%s: nv_nic_irq\n", dev->name);
 
-	for (i=0; ; i++) {
-		if (!(np->msi_flags & NV_MSI_X_ENABLED)) {
-			np->events = readl(base + NvRegIrqStatus);
-			writel(NVREG_IRQSTAT_MASK, base + NvRegIrqStatus);
-		} else {
-			np->events = readl(base + NvRegMSIXIrqStatus);
-			writel(NVREG_IRQSTAT_MASK, base + NvRegMSIXIrqStatus);
-		}
-		dprintk(KERN_DEBUG "%s: irq: %08x\n", dev->name, np->events);
-		if (!(np->events & np->irqmask))
-			break;
+	if (!(np->msi_flags & NV_MSI_X_ENABLED)) {
+		np->events = readl(base + NvRegIrqStatus);
+		writel(NVREG_IRQSTAT_MASK, base + NvRegIrqStatus);
+	} else {
+		np->events = readl(base + NvRegMSIXIrqStatus);
+		writel(NVREG_IRQSTAT_MASK, base + NvRegMSIXIrqStatus);
+	}
+	dprintk(KERN_DEBUG "%s: irq: %08x\n", dev->name, np->events);
+	if (!(np->events & np->irqmask))
+		return IRQ_NONE;
 
-		nv_msi_workaround(np);
+	nv_msi_workaround(np);
 
 #ifdef CONFIG_FORCEDETH_NAPI
-		spin_lock(&np->lock);
-		napi_schedule(&np->napi);
+	spin_lock(&np->lock);
+	napi_schedule(&np->napi);
 
-		/* Disable furthur irq's
-		   (msix not enabled with napi) */
-		writel(0, base + NvRegIrqMask);
+	/* Disable furthur irq's
+	   (msix not enabled with napi) */
+	writel(0, base + NvRegIrqMask);
 
-		spin_unlock(&np->lock);
+	spin_unlock(&np->lock);
 
-		return IRQ_HANDLED;
+	return IRQ_HANDLED;
 #else
-		spin_lock(&np->lock);
-		nv_tx_done(dev, np->tx_ring_size);
-		spin_unlock(&np->lock);
-
-		if (nv_rx_process(dev, RX_WORK_PER_LOOP)) {
-			if (unlikely(nv_alloc_rx(dev))) {
-				spin_lock(&np->lock);
-				if (!np->in_shutdown)
-					mod_timer(&np->oom_kick, jiffies + OOM_REFILL);
-				spin_unlock(&np->lock);
-			}
-		}
+	spin_lock(&np->lock);
+	nv_tx_done(dev, np->tx_ring_size);
+	spin_unlock(&np->lock);
 
-		if (unlikely(np->events & NVREG_IRQ_LINK)) {
-			spin_lock(&np->lock);
-			nv_link_irq(dev);
-			spin_unlock(&np->lock);
-		}
-		if (unlikely(np->need_linktimer && time_after(jiffies, np->link_timeout))) {
+	if (nv_rx_process(dev, RX_WORK_PER_LOOP)) {
+		if (unlikely(nv_alloc_rx(dev))) {
 			spin_lock(&np->lock);
-			nv_linkchange(dev);
+			if (!np->in_shutdown)
+				mod_timer(&np->oom_kick, jiffies + OOM_REFILL);
 			spin_unlock(&np->lock);
-			np->link_timeout = jiffies + LINK_TIMEOUT;
 		}
-		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))
-				writel(0, base + NvRegIrqMask);
-			else
-				writel(np->irqmask, base + NvRegIrqMask);
-			pci_push(base);
+	}
 
-			if (!np->in_shutdown) {
-				np->nic_poll_irq = np->irqmask;
-				np->recover_error = 1;
-				mod_timer(&np->nic_poll, jiffies + POLL_WAIT);
-			}
-			spin_unlock(&np->lock);
-			break;
-		}
-		if (unlikely(i > max_interrupt_work)) {
-			spin_lock(&np->lock);
-			/* disable interrupts on the nic */
-			if (!(np->msi_flags & NV_MSI_X_ENABLED))
-				writel(0, base + NvRegIrqMask);
-			else
-				writel(np->irqmask, base + NvRegIrqMask);
-			pci_push(base);
+	if (unlikely(np->events & NVREG_IRQ_LINK)) {
+		spin_lock(&np->lock);
+		nv_link_irq(dev);
+		spin_unlock(&np->lock);
+	}
+	if (unlikely(np->need_linktimer && time_after(jiffies, np->link_timeout))) {
+		spin_lock(&np->lock);
+		nv_linkchange(dev);
+		spin_unlock(&np->lock);
+		np->link_timeout = jiffies + LINK_TIMEOUT;
+	}
+	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))
+			writel(0, base + NvRegIrqMask);
+		else
+			writel(np->irqmask, base + NvRegIrqMask);
+		pci_push(base);
 
-			if (!np->in_shutdown) {
-				np->nic_poll_irq = np->irqmask;
-				mod_timer(&np->nic_poll, jiffies + POLL_WAIT);
-			}
-			spin_unlock(&np->lock);
-			printk(KERN_DEBUG "%s: too many iterations (%d) in nv_nic_irq.\n", dev->name, i);
-			break;
+		if (!np->in_shutdown) {
+			np->nic_poll_irq = np->irqmask;
+			np->recover_error = 1;
+			mod_timer(&np->nic_poll, jiffies + POLL_WAIT);
 		}
-#endif
+		spin_unlock(&np->lock);
 	}
+#endif
 	dprintk(KERN_DEBUG "%s: nv_nic_irq completed\n", dev->name);
 
-	return IRQ_RETVAL(i);
+	return IRQ_HANDLED;
 }
 
 /**
@@ -3528,100 +3507,79 @@
 	struct net_device *dev = (struct net_device *) data;
 	struct fe_priv *np = netdev_priv(dev);
 	u8 __iomem *base = get_hwbase(dev);
-	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)) {
-			np->events = readl(base + NvRegIrqStatus);
-			writel(NVREG_IRQSTAT_MASK, base + NvRegIrqStatus);
-		} else {
-			np->events = readl(base + NvRegMSIXIrqStatus);
-			writel(NVREG_IRQSTAT_MASK, base + NvRegMSIXIrqStatus);
-		}
-		dprintk(KERN_DEBUG "%s: irq: %08x\n", dev->name, np->events);
-		if (!(np->events & np->irqmask))
-			break;
+	if (!(np->msi_flags & NV_MSI_X_ENABLED)) {
+		np->events = readl(base + NvRegIrqStatus);
+		writel(NVREG_IRQSTAT_MASK, base + NvRegIrqStatus);
+	} else {
+		np->events = readl(base + NvRegMSIXIrqStatus);
+		writel(NVREG_IRQSTAT_MASK, base + NvRegMSIXIrqStatus);
+	}
+	dprintk(KERN_DEBUG "%s: irq: %08x\n", dev->name, np->events);
+	if (!(np->events & np->irqmask))
+		return IRQ_NONE;
 
-		nv_msi_workaround(np);
+	nv_msi_workaround(np);
 
 #ifdef CONFIG_FORCEDETH_NAPI
-		spin_lock(&np->lock);
-		napi_schedule(&np->napi);
+	spin_lock(&np->lock);
+	napi_schedule(&np->napi);
 
-		/* Disable furthur irq's
-		   (msix not enabled with napi) */
-		writel(0, base + NvRegIrqMask);
+	/* Disable furthur irq's
+	   (msix not enabled with napi) */
+	writel(0, base + NvRegIrqMask);
 
-		spin_unlock(&np->lock);
+	spin_unlock(&np->lock);
 
-		return IRQ_HANDLED;
+	return IRQ_HANDLED;
 #else
-		spin_lock(&np->lock);
-		nv_tx_done_optimized(dev, TX_WORK_PER_LOOP);
-		spin_unlock(&np->lock);
-
-		if (nv_rx_process_optimized(dev, RX_WORK_PER_LOOP)) {
-			if (unlikely(nv_alloc_rx_optimized(dev))) {
-				spin_lock(&np->lock);
-				if (!np->in_shutdown)
-					mod_timer(&np->oom_kick, jiffies + OOM_REFILL);
-				spin_unlock(&np->lock);
-			}
-		}
+	spin_lock(&np->lock);
+	nv_tx_done_optimized(dev, TX_WORK_PER_LOOP);
+	spin_unlock(&np->lock);
 
-		if (unlikely(np->events & NVREG_IRQ_LINK)) {
-			spin_lock(&np->lock);
-			nv_link_irq(dev);
-			spin_unlock(&np->lock);
-		}
-		if (unlikely(np->need_linktimer && time_after(jiffies, np->link_timeout))) {
-			spin_lock(&np->lock);
-			nv_linkchange(dev);
-			spin_unlock(&np->lock);
-			np->link_timeout = jiffies + LINK_TIMEOUT;
-		}
-		if (unlikely(np->events & NVREG_IRQ_RECOVER_ERROR)) {
+	if (nv_rx_process_optimized(dev, RX_WORK_PER_LOOP)) {
+		if (unlikely(nv_alloc_rx_optimized(dev))) {
 			spin_lock(&np->lock);
-			/* disable interrupts on the nic */
-			if (!(np->msi_flags & NV_MSI_X_ENABLED))
-				writel(0, base + NvRegIrqMask);
-			else
-				writel(np->irqmask, base + NvRegIrqMask);
-			pci_push(base);
-
-			if (!np->in_shutdown) {
-				np->nic_poll_irq = np->irqmask;
-				np->recover_error = 1;
-				mod_timer(&np->nic_poll, jiffies + POLL_WAIT);
-			}
+			if (!np->in_shutdown)
+				mod_timer(&np->oom_kick, jiffies + OOM_REFILL);
 			spin_unlock(&np->lock);
-			break;
 		}
+	}
 
-		if (unlikely(i > max_interrupt_work)) {
-			spin_lock(&np->lock);
-			/* disable interrupts on the nic */
-			if (!(np->msi_flags & NV_MSI_X_ENABLED))
-				writel(0, base + NvRegIrqMask);
-			else
-				writel(np->irqmask, base + NvRegIrqMask);
-			pci_push(base);
+	if (unlikely(np->events & NVREG_IRQ_LINK)) {
+		spin_lock(&np->lock);
+		nv_link_irq(dev);
+		spin_unlock(&np->lock);
+	}
+	if (unlikely(np->need_linktimer && time_after(jiffies, np->link_timeout))) {
+		spin_lock(&np->lock);
+		nv_linkchange(dev);
+		spin_unlock(&np->lock);
+		np->link_timeout = jiffies + LINK_TIMEOUT;
+	}
+	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))
+			writel(0, base + NvRegIrqMask);
+		else
+			writel(np->irqmask, base + NvRegIrqMask);
+		pci_push(base);
 
-			if (!np->in_shutdown) {
-				np->nic_poll_irq = np->irqmask;
-				mod_timer(&np->nic_poll, jiffies + POLL_WAIT);
-			}
-			spin_unlock(&np->lock);
-			printk(KERN_DEBUG "%s: too many iterations (%d) in nv_nic_irq.\n", dev->name, i);
-			break;
+		if (!np->in_shutdown) {
+			np->nic_poll_irq = np->irqmask;
+			np->recover_error = 1;
+			mod_timer(&np->nic_poll, jiffies + POLL_WAIT);
 		}
-#endif
+		spin_unlock(&np->lock);
 	}
+
+#endif
 	dprintk(KERN_DEBUG "%s: nv_nic_irq_optimized completed\n", dev->name);
 
-	return IRQ_RETVAL(i);
+	return IRQ_HANDLED;
 }
 
 static irqreturn_t nv_nic_irq_tx(int foo, void *data)