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MIPS: RB532: Check irq number when handling GPIO interrupts

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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>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Florian Fainelli 2009-05-21 19:49:47 +02:00 committed by Ralf Baechle
parent 1c99dac8bf
commit d36773e53f
1 changed files with 3 additions and 2 deletions
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5
arch/mips/rb532/irq.c
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@ -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 14 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) {