1 files changed, 25 insertions, 20 deletions

diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c
index 7df9abd5ec8..b483deed311 100644
--- a/kernel/irq/spurious.c
+++ b/kernel/irq/spurious.c
@@ -11,27 +11,25 @@
 #include <linux/kallsyms.h>
 #include <linux/interrupt.h>
 
-static int irqfixup;
+static int irqfixup __read_mostly;
 
 /*
  * Recovery handler for misrouted interrupts.
  */
-
 static int misrouted_irq(int irq, struct pt_regs *regs)
 {
 	int i;
-	irq_desc_t *desc;
 	int ok = 0;
 	int work = 0;	/* Did we do work for a real IRQ */
 
-	for(i = 1; i < NR_IRQS; i++) {
+	for (i = 1; i < NR_IRQS; i++) {
+		struct irq_desc *desc = irq_desc + i;
 		struct irqaction *action;
 
 		if (i == irq)	/* Already tried */
 			continue;
-		desc = &irq_desc[i];
+
 		spin_lock(&desc->lock);
-		action = desc->action;
 		/* Already running on another processor */
 		if (desc->status & IRQ_INPROGRESS) {
 			/*
@@ -45,7 +43,9 @@ static int misrouted_irq(int irq, struct pt_regs *regs)
 		}
 		/* Honour the normal IRQ locking */
 		desc->status |= IRQ_INPROGRESS;
+		action = desc->action;
 		spin_unlock(&desc->lock);
+
 		while (action) {
 			/* Only shared IRQ handlers are safe to call */
 			if (action->flags & SA_SHIRQ) {
@@ -62,9 +62,8 @@ static int misrouted_irq(int irq, struct pt_regs *regs)
 
 		/*
 		 * While we were looking for a fixup someone queued a real
-		 * IRQ clashing with our walk
+		 * IRQ clashing with our walk:
 		 */
-
 		while ((desc->status & IRQ_PENDING) && action) {
 			/*
 			 * Perform real IRQ processing for the IRQ we deferred
@@ -80,8 +79,8 @@ static int misrouted_irq(int irq, struct pt_regs *regs)
 		 * If we did actual work for the real IRQ line we must let the
 		 * IRQ controller clean up too
 		 */
-		if(work)
-			desc->handler->end(i);
+		if (work && desc->chip && desc->chip->end)
+			desc->chip->end(i);
 		spin_unlock(&desc->lock);
 	}
 	/* So the caller can adjust the irq error counts */
@@ -100,7 +99,8 @@ static int misrouted_irq(int irq, struct pt_regs *regs)
  */
 
 static void
-__report_bad_irq(unsigned int irq, irq_desc_t *desc, irqreturn_t action_ret)
+__report_bad_irq(unsigned int irq, struct irq_desc *desc,
+		 irqreturn_t action_ret)
 {
 	struct irqaction *action;
 
@@ -113,6 +113,7 @@ __report_bad_irq(unsigned int irq, irq_desc_t *desc, irqreturn_t action_ret)
 	}
 	dump_stack();
 	printk(KERN_ERR "handlers:\n");
+
 	action = desc->action;
 	while (action) {
 		printk(KERN_ERR "[<%p>]", action->handler);
@@ -123,7 +124,8 @@ __report_bad_irq(unsigned int irq, irq_desc_t *desc, irqreturn_t action_ret)
 	}
 }
 
-static void report_bad_irq(unsigned int irq, irq_desc_t *desc, irqreturn_t action_ret)
+static void
+report_bad_irq(unsigned int irq, struct irq_desc *desc, irqreturn_t action_ret)
 {
 	static int count = 100;
 
@@ -133,12 +135,12 @@ static void report_bad_irq(unsigned int irq, irq_desc_t *desc, irqreturn_t actio
 	}
 }
 
-void note_interrupt(unsigned int irq, irq_desc_t *desc, irqreturn_t action_ret,
-			struct pt_regs *regs)
+void note_interrupt(unsigned int irq, struct irq_desc *desc,
+		    irqreturn_t action_ret, struct pt_regs *regs)
 {
-	if (action_ret != IRQ_HANDLED) {
+	if (unlikely(action_ret != IRQ_HANDLED)) {
 		desc->irqs_unhandled++;
-		if (action_ret != IRQ_NONE)
+		if (unlikely(action_ret != IRQ_NONE))
 			report_bad_irq(irq, desc, action_ret);
 	}
 
@@ -152,11 +154,11 @@ void note_interrupt(unsigned int irq, irq_desc_t *desc, irqreturn_t action_ret,
 	}
 
 	desc->irq_count++;
-	if (desc->irq_count < 100000)
+	if (likely(desc->irq_count < 100000))
 		return;
 
 	desc->irq_count = 0;
-	if (desc->irqs_unhandled > 99900) {
+	if (unlikely(desc->irqs_unhandled > 99900)) {
 		/*
 		 * The interrupt is stuck
 		 */
@@ -166,17 +168,19 @@ void note_interrupt(unsigned int irq, irq_desc_t *desc, irqreturn_t action_ret,
 		 */
 		printk(KERN_EMERG "Disabling IRQ #%d\n", irq);
 		desc->status |= IRQ_DISABLED;
-		desc->handler->disable(irq);
+		desc->depth = 1;
+		desc->chip->disable(irq);
 	}
 	desc->irqs_unhandled = 0;
 }
 
-int noirqdebug;
+int noirqdebug __read_mostly;
 
 int __init noirqdebug_setup(char *str)
 {
 	noirqdebug = 1;
 	printk(KERN_INFO "IRQ lockup detection disabled\n");
+
 	return 1;
 }
 
@@ -187,6 +191,7 @@ static int __init irqfixup_setup(char *str)
 	irqfixup = 1;
 	printk(KERN_WARNING "Misrouted IRQ fixup support enabled.\n");
 	printk(KERN_WARNING "This may impact system performance.\n");
+
 	return 1;
 }