From e28ecca6eac40646780b83edab81a496cea3d220 Mon Sep 17 00:00:00 2001 From: Sudip Mukherjee Date: Sun, 27 Dec 2015 19:06:50 +0530 Subject: [PATCH] gpio: fix warning about iterator We were getting build warning about "iterator" being used uninitialized. Use iterator properly to fix the build warning and in the process remove the variable "pos" which is not required now. Signed-off-by: Sudip Mukherjee Signed-off-by: Linus Walleij --- drivers/gpio/gpiolib.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 975a548bd71e..ca6630207c66 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -189,23 +189,21 @@ EXPORT_SYMBOL_GPL(gpiod_get_direction); */ static int gpiochip_add_to_list(struct gpio_chip *chip) { - struct list_head *pos; struct gpio_chip *iterator; struct gpio_chip *previous = NULL; if (list_empty(&gpio_chips)) { - pos = gpio_chips.next; - goto found; + list_add_tail(&chip->list, &gpio_chips); + return 0; } - list_for_each(pos, &gpio_chips) { - iterator = list_entry(pos, struct gpio_chip, list); + list_for_each_entry(iterator, &gpio_chips, list) { if (iterator->base >= chip->base + chip->ngpio) { /* * Iterator is the first GPIO chip so there is no * previous one */ - if (previous == NULL) { + if (!previous) { goto found; } else { /* @@ -221,7 +219,13 @@ static int gpiochip_add_to_list(struct gpio_chip *chip) previous = iterator; } - /* We are beyond the last chip in the list */ + /* + * We are beyond the last chip in the list and iterator now + * points to the head. + * Let iterator point to the last chip in the list. + */ + + iterator = list_last_entry(&gpio_chips, struct gpio_chip, list); if (iterator->base + iterator->ngpio <= chip->base) goto found; @@ -230,7 +234,7 @@ static int gpiochip_add_to_list(struct gpio_chip *chip) return -EBUSY; found: - list_add_tail(&chip->list, pos); + list_add_tail(&chip->list, &iterator->list); return 0; } -- 2.39.5