[PATCH 09/10] gpiolib: use gpiochip_dup_line_label() in for_each helpers

[Bartosz Golaszewski <brgl@bgdev.pl>]

From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Rework for_each_requested_gpio_in_range() to use the new helper to
retrieve a dynamically allocated copy of the descriptor label and free
it at the end of each iteration.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
 include/linux/gpio/driver.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index 9796a34e2fee..6405f6d454af 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -543,8 +543,10 @@ char *gpiochip_dup_line_label(struct gpio_chip *gc, unsigned int offset);
  * @label:	label of current GPIO
  */
 #define for_each_requested_gpio_in_range(chip, i, base, size, label)			\
-	for (i = 0; i < size; i++)							\
-		if ((label = gpiochip_is_requested(chip, base + i)) == NULL) {} else
+	for (i = 0; i < size; i++, kfree(label))					\
+		if ((label = gpiochip_dup_line_label(chip, base + i)) == NULL) {}	\
+		else if (IS_ERR(label)) {}						\
+		else
 
 /* Iterates over all requested GPIO of the given @chip */
 #define for_each_requested_gpio(chip, i, label)						\
-- 
2.40.1