Comment 3 for bug 1632527

From Mika Westerberg

To backport to kernel 4.4, we need some extra work besides that commit.
   1. 6cee382 ("gpio/pinctrl: sunxi: stop poking around in private vars")
   2.
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index db007a3e2af7..6240dd40e8be 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1524,7 +1524,7 @@ bool gpiochip_line_is_irq(struct gpio_chip *chip, unsigned int offset)
        if (offset >= chip->ngpio)
                return false;

- return test_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags);
+ return test_bit(FLAG_USED_AS_IRQ, &chip->desc[offset].flags);
 }
 EXPORT_SYMBOL_GPL(gpiochip_line_is_irq);