diff --git a/sys/dev/gpio/gpiobus.c b/sys/dev/gpio/gpiobus.c
--- a/sys/dev/gpio/gpiobus.c
+++ b/sys/dev/gpio/gpiobus.c
@@ -213,21 +213,27 @@
 	return (0);
 }
 
-void
+int
 gpio_pin_release(gpio_pin_t gpio)
 {
 	device_t busdev;
+	int rv;
 
 	if (gpio == NULL)
-		return;
+		return (EINVAL);
 
 	KASSERT(gpio->dev != NULL, ("GPIO pin device is NULL."));
 
 	busdev = GPIO_GET_BUS(gpio->dev);
-	if (busdev != NULL)
-		gpiobus_release_pin(busdev, gpio->pin);
+	if (busdev == NULL)
+		return (ENXIO);
+
+	rv = gpiobus_release_pin(busdev, gpio->pin);
+	if (rv != 0)
+		return (rv);
 
 	free(gpio, M_DEVBUF);
+	return (0);
 }
 
 int
diff --git a/sys/dev/gpio/gpiobusvar.h b/sys/dev/gpio/gpiobusvar.h
--- a/sys/dev/gpio/gpiobusvar.h
+++ b/sys/dev/gpio/gpiobusvar.h
@@ -157,7 +157,7 @@
 int gpio_pin_get_by_child_index(device_t _child, uint32_t _idx, gpio_pin_t *_gp);
 
 /* Release a pin acquired via any gpio_pin_get_xxx() function. */
-void gpio_pin_release(gpio_pin_t gpio);
+int gpio_pin_release(gpio_pin_t gpio);
 
 /* Work with gpio pins acquired using the functions above. */
 int gpio_pin_getcaps(gpio_pin_t pin, uint32_t *caps);