[PATCH 2/2] rb532: check irq number when handling GPIO interrupts

[Florian Fainelli <florian@openwrt.org>]

This patch makes sure that we are not going to clear
or change the interrupt status of a GPIO interrupt
superior to 13 as this is the maximum number of GPIO
interrupt source (p.232 of the RC32434 reference manual).

Signed-off-by: Florian Fainelli <florian@openwrt.org>
---
diff --git a/arch/mips/rb532/irq.c b/arch/mips/rb532/irq.c
index 53eeb5e..afdcafc 100644
--- a/arch/mips/rb532/irq.c
+++ b/arch/mips/rb532/irq.c
@@ -151,7 +151,8 @@ static void rb532_disable_irq(unsigned int irq_nr)
                mask |= intr_bit;
                WRITE_MASK(addr, mask);
 
-               if (group == GPIO_MAPPED_IRQ_GROUP)
+               /* There is a maximum of 13 GPIO interrupts */
+               if (group == GPIO_MAPPED_IRQ_GROUP && irq_nr <= 
(GROUP4_IRQ_BASE + 13))
                        rb532_gpio_set_istat(0, irq_nr - GPIO_MAPPED_IRQ_BASE);
 
                /*
@@ -174,7 +175,7 @@ static int rb532_set_type(unsigned int irq_nr, unsigned 
type)
        int gpio = irq_nr - GPIO_MAPPED_IRQ_BASE;
        int group = irq_to_group(irq_nr);
 
-       if (group != GPIO_MAPPED_IRQ_GROUP)
+       if (group != GPIO_MAPPED_IRQ_GROUP || irq_nr > (GROUP4_IRQ_BASE + 13))
                return (type == IRQ_TYPE_LEVEL_HIGH) ? 0 : -EINVAL;
 
        switch (type) {