gpio / ACPI: return -ENOENT when no mapping exists

Doing this allows drivers to distinguish between a real error case (if
there was an error when we tried to resolve the GPIO) and when the optional
GPIO line was not available.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Alexandre Courbot <acourbot@nvidia.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index ae0ffdc..137d20c 100644 (file)
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -307,6 +307,6 @@ struct gpio_desc *acpi_get_gpiod_by_index(struct device *dev, int index,
        if (lookup.desc && info)
                *info = lookup.info;
 
-       return lookup.desc ? lookup.desc : ERR_PTR(-ENODEV);
+       return lookup.desc ? lookup.desc : ERR_PTR(-ENOENT);
 }
 EXPORT_SYMBOL_GPL(acpi_get_gpiod_by_index);