gpio: gpio-altera: Remove gpiochip on probe failure.

On failure to setup the irq altera_gpio_probe would return an error
but not go to cleanup. This resulted in kernel fault
"Unable to handle kernel paging request at virtual address xxxxxxxx"
later on in of_gpiochip_find_and_xlate.

Signed-off-by: Phil Reid <preid@electromag.com.au>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpio-altera.c b/drivers/gpio/gpio-altera.c
index 2aeaebd..3f87a03 100644 (file)
--- a/drivers/gpio/gpio-altera.c
+++ b/drivers/gpio/gpio-altera.c
@@ -312,8 +312,8 @@ static int altera_gpio_probe(struct platform_device *pdev)
                handle_simple_irq, IRQ_TYPE_NONE);
 
        if (ret) {
-               dev_info(&pdev->dev, "could not add irqchip\n");
-               return ret;
+               dev_err(&pdev->dev, "could not add irqchip\n");
+               goto teardown;
        }
 
        gpiochip_set_chained_irqchip(&altera_gc->mmchip.gc,
@@ -326,6 +326,7 @@ static int altera_gpio_probe(struct platform_device *pdev)
 skip_irq:
        return 0;
 teardown:
+       of_mm_gpiochip_remove(&altera_gc->mmchip);
        pr_err("%s: registration failed with status %d\n",
                node->full_name, ret);