irqchip: spear_shirq: Remove the parent irq "ack"/unmask

"ack" is actually a mask in the parent irq. The demultiplexer and the
handlers run with interrupts disabled. No point in masking and
unmasking the parent.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20140619212713.754300980@linutronix.deAcked-by: NViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: NJason Cooper <jason@lakedaemon.net>

drivers/irqchip/spear-shirq.c

@@ -222,12 +222,8 @@ static struct irq_chip shirq_chip = {
 static void shirq_handler(unsigned irq, struct irq_desc *desc)
 {
 	struct spear_shirq *shirq = irq_get_handler_data(irq);
-	struct irq_data *idata = irq_desc_get_irq_data(desc);
-	struct irq_chip *chip = irq_data_get_irq_chip(idata);
 	u32 pend;
 
-	chip->irq_ack(idata);
-
 	pend = readl(shirq->base + shirq->regs.status_reg) & shirq->mask;
 	pend >>= shirq->offset;
 
@@ -237,8 +233,6 @@ static void shirq_handler(unsigned irq, struct irq_desc *desc)
 		pend &= ~(0x1 << irq);
 		generic_handle_irq(shirq->virq_base + irq);
 	}
-
-	chip->irq_unmask(idata);
 }
 
 static void __init spear_shirq_register(struct spear_shirq *shirq,