gpio: don't override irq_*_resources() callbacks

If the driver has specified its own irq_{request/release}_resources()
functions, don't override them.  The gpio-etraxfs driver will use this.

Signed-off-by: Rabin Vincent <rabin@rab.in>
[Added a small comment blurb]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 1b5b8da..34f95fb 100644 (file)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -641,8 +641,16 @@ int gpiochip_irqchip_add(struct gpio_chip *gpiochip,
                gpiochip->irqchip = NULL;
                return -EINVAL;
        }
-       irqchip->irq_request_resources = gpiochip_irq_reqres;
-       irqchip->irq_release_resources = gpiochip_irq_relres;
+
+       /*
+        * It is possible for a driver to override this, but only if the
+        * alternative functions are both implemented.
+        */
+       if (!irqchip->irq_request_resources &&
+           !irqchip->irq_release_resources) {
+               irqchip->irq_request_resources = gpiochip_irq_reqres;
+               irqchip->irq_release_resources = gpiochip_irq_relres;
+       }
 
        /*
         * Prepare the mapping since the irqchip shall be orthogonal to