[PATCH 3/4] ARM: pxa: add irq ack for gpio irq

[Chao Xie]

For previous pxa3xx and pxa168, pxa9xx, the interrupt controller does
not need any ack for the interrupt.
For next ARM V7 SMP core, it will use GIC, and it need ack for the
interrupt.

Signed-off-by: Chao Xie <chao.xie at marvell.com>
---
 arch/arm/plat-pxa/gpio.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/arm/plat-pxa/gpio.c b/arch/arm/plat-pxa/gpio.c
index 15de09d..66ae80a 100644
--- a/arch/arm/plat-pxa/gpio.c
+++ b/arch/arm/plat-pxa/gpio.c
@@ -19,6 +19,7 @@
 #include <linux/slab.h>
 
 #include <mach/gpio.h>
+#include <asm/mach/irq.h>
 
 int pxa_last_gpio;
 
@@ -206,7 +207,9 @@ static void pxa_gpio_demux_handler(unsigned int irq, struct irq_desc *desc)
 	struct pxa_gpio_chip *c;
 	int loop, gpio, gpio_base, n;
 	unsigned long gedr;
+	struct irq_chip *chip = irq_get_chip(irq);
 
+	chained_irq_enter(chip, desc);
 	do {
 		loop = 0;
 		for_each_gpio_chip(gpio, c) {
@@ -225,6 +228,7 @@ static void pxa_gpio_demux_handler(unsigned int irq, struct irq_desc *desc)
 			}
 		}
 	} while (loop);
+	chained_irq_exit(chip, desc);
 }
 
 static void pxa_ack_muxed_gpio(struct irq_data *d)
-- 
1.7.0.4