Blackfin arch: add a check to make sure only Blackfin GPIOs may generate IRQs

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/arch/blackfin/include/asm/gpio.h b/arch/blackfin/include/asm/gpio.h
index d4a082ef75b4..3c99ddc8df16 100644
--- a/arch/blackfin/include/asm/gpio.h
+++ b/arch/blackfin/include/asm/gpio.h
@@ -303,7 +303,10 @@ static inline void gpio_set_value(unsigned gpio, int value)
 
 static inline int gpio_to_irq(unsigned gpio)
 {
-        return (gpio + GPIO_IRQ_BASE);
+        if (likely(gpio < MAX_BLACKFIN_GPIOS))
+                return gpio + GPIO_IRQ_BASE;
+
+        return -EINVAL;
 }
 
 static inline int irq_to_gpio(unsigned irq)