Fix edge-triggered IRQ handling. See Linus's cset 1.611 for details.

arch/ia64/kernel/irq.c

@@ -403,8 +403,8 @@ unsigned int do_IRQ(unsigned long irq, struct pt_regs *regs)
 				break;
 			desc->status &= ~IRQ_PENDING;
 		}
-	  out:
 		desc->status &= ~IRQ_INPROGRESS;
+	  out:
 		/*
 		 * The ->end() handler has to deal with interrupts which got
 		 * disabled while the handler was running.
@@ -788,7 +788,7 @@ int setup_irq(unsigned int irq, struct irqaction * new)
 
 	if (!shared) {
 		desc->depth = 0;
-		desc->status &= ~(IRQ_DISABLED | IRQ_AUTODETECT | IRQ_WAITING);
+		desc->status &= ~(IRQ_DISABLED | IRQ_AUTODETECT | IRQ_WAITING | IRQ_INPROGRESS);
 		desc->handler->startup(irq);
 	}
 	spin_unlock_irqrestore(&desc->lock,flags);