[ARM PATCH] 2219/2: Ignore IRQ_NONE for edge triggered interrupts

Patch from Ian Campbell

As discussed on the ARM Linux kernel mailing list. With edge triggered interrupts it is impossible to avoid spurious interrupts and so it makes sense to just ignore IRQ_NONE return values in this case. 

Signed-off-by: Ian Campbell 
Signed-off-by: Russell King

arch/arm/kernel/irq.c

@@ -376,7 +376,6 @@ do_edge_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
 
 	do {
 		struct irqaction *action;
-		int ret;
 
 		action = desc->action;
 		if (!action)
@@ -387,9 +386,7 @@ do_edge_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
 			desc->chip->unmask(irq);
 		}
 
-		ret = __do_irq(irq, action, regs);
-		if (ret != IRQ_HANDLED)
-			report_bad_irq(irq, regs, desc, ret);
+		__do_irq(irq, action, regs);
 	} while (desc->pending && !desc->disable_depth);
 
 	desc->running = 0;