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gpio: fix gpio leak in gpiochip_add error path 

Make sure to free any hogged gpios on errors in gpiochip_add.

Also move all forward declarations to the top of the file.

Fixes: f625d46017 ("gpio: add GPIO hogging mechanism")
Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Johan Hovold 2015-05-04 17:23:25 +02:00 committed by Linus Walleij
parent 030bbdbf4c
commit 6d86750ce6
1 changed files with 6 additions and 4 deletions
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10
drivers/gpio/gpiolib.c
View File

@ -53,6 +53,11 @@ static DEFINE_MUTEX(gpio_lookup_lock);
static LIST_HEAD(gpio_lookup_list);
LIST_HEAD(gpio_chips);
static void gpiochip_free_hogs(struct gpio_chip *chip);
static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip);
static inline void desc_set_label(struct gpio_desc *d, const char *label)
{
d->label = label;
@ -297,6 +302,7 @@ int gpiochip_add(struct gpio_chip *chip)
err_remove_chip:
acpi_gpiochip_remove(chip);
gpiochip_free_hogs(chip);
of_gpiochip_remove(chip);
spin_lock_irqsave(&gpio_lock, flags);
list_del(&chip->list);
@ -313,10 +319,6 @@ err_free_descs:
}
EXPORT_SYMBOL_GPL(gpiochip_add);
/* Forward-declaration */
static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip);
static void gpiochip_free_hogs(struct gpio_chip *chip);
/**
* gpiochip_remove() - unregister a gpio_chip
* @chip: the chip to unregister