diff --git a/arch/blackfin/include/asm/gpio.h b/arch/blackfin/include/asm/gpio.h
index d4a082ef..3c99ddc 100644
--- a/arch/blackfin/include/asm/gpio.h
+++ b/arch/blackfin/include/asm/gpio.h
@@ -303,7 +303,10 @@
 
 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)