[ARM] Fix sa1111 IRQ handling

We must clear down all currently pending IRQs before servicing any
IRQ on the chip.  This prevents immediate recursion into the
interrupt handling paths when we service the first IRQ.

arch/arm/mach-sa1100/sa1111.c

@@ -172,11 +172,15 @@ sa1111_irq_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
 {
 	unsigned int stat0, stat1, i;
 
-	desc->chip->ack(irq);
-
 	stat0 = INTSTATCLR0;
 	stat1 = INTSTATCLR1;
 
+	INTSTATCLR0 = stat0;
+
+	desc->chip->ack(irq);
+
+	INTSTATCLR1 = stat1;
+
 	if (stat0 == 0 && stat1 == 0) {
 		do_bad_IRQ(irq, desc, regs);
 		return;
@@ -197,9 +201,8 @@ sa1111_irq_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
 #define SA1111_IRQMASK_LO(x)	(1 << (x - IRQ_SA1111_START))
 #define SA1111_IRQMASK_HI(x)	(1 << (x - IRQ_SA1111_START - 32))
 
-static void sa1111_ack_lowirq(unsigned int irq)
+static void sa1111_ack_irq(unsigned int irq)
 {
-	INTSTATCLR0 = SA1111_IRQMASK_LO(irq);
 }
 
 static void sa1111_mask_lowirq(unsigned int irq)
@@ -255,18 +258,13 @@ static int sa1111_type_lowirq(unsigned int irq, unsigned int flags)
 }
 
 static struct irqchip sa1111_low_chip = {
-	.ack		= sa1111_ack_lowirq,
+	.ack		= sa1111_ack_irq,
 	.mask		= sa1111_mask_lowirq,
 	.unmask		= sa1111_unmask_lowirq,
 	.rerun		= sa1111_rerun_lowirq,
 	.type		= sa1111_type_lowirq,
 };
 
-static void sa1111_ack_highirq(unsigned int irq)
-{
-	INTSTATCLR1 = SA1111_IRQMASK_HI(irq);
-}
-
 static void sa1111_mask_highirq(unsigned int irq)
 {
 	INTEN1 &= ~SA1111_IRQMASK_HI(irq);
@@ -320,7 +318,7 @@ static int sa1111_type_highirq(unsigned int irq, unsigned int flags)
 }
 
 static struct irqchip sa1111_high_chip = {
-	.ack		= sa1111_ack_highirq,
+	.ack		= sa1111_ack_irq,
 	.mask		= sa1111_mask_highirq,
 	.unmask		= sa1111_unmask_highirq,
 	.rerun		= sa1111_rerun_highirq,