gpio: constify opaque pointer in gpio_device_find() match function

The match function used in gpio_device_find() should not modify the
contents of passed opaque pointer, because such modification would not
be necessary for actual matching and it could lead to quite unreadable,
spaghetti code.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
[Bartosz: fix coding style in header]
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index d068788adb10..288aed5a9f6b 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1119,7 +1119,7 @@ EXPORT_SYMBOL_GPL(gpiochip_remove);
  */
 struct gpio_device *gpio_device_find(void *data,
 				     int (*match)(struct gpio_chip *gc,
-						  void *data))
+						  const void *data))
 {
 	struct gpio_device *gdev;
 
@@ -1141,7 +1141,7 @@ struct gpio_device *gpio_device_find(void *data,
 }
 EXPORT_SYMBOL_GPL(gpio_device_find);
 
-static int gpio_chip_match_by_label(struct gpio_chip *gc, void *label)
+static int gpio_chip_match_by_label(struct gpio_chip *gc, const void *label)
 {
 	return gc->label && !strcmp(gc->label, label);
 }
@@ -1161,7 +1161,7 @@ struct gpio_device *gpio_device_find_by_label(const char *label)
 }
 EXPORT_SYMBOL_GPL(gpio_device_find_by_label);
 
-static int gpio_chip_match_by_fwnode(struct gpio_chip *gc, void *fwnode)
+static int gpio_chip_match_by_fwnode(struct gpio_chip *gc, const void *fwnode)
 {
 	return device_match_fwnode(&gc->gpiodev->dev, fwnode);
 }