MIPS: RB532: Check irq number when handling GPIO interrupts
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>
diff --git a/arch/mips/rb532/irq.c b/arch/mips/rb532/irq.c
index 53eeb5e..f078820 100644
--- a/arch/mips/rb532/irq.c
+++ b/arch/mips/rb532/irq.c
@@ -151,7 +151,8 @@
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 @@
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) {