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Commit 6d86750c authored by Johan Hovold's avatar Johan Hovold Committed by Linus Walleij
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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: f625d460 ("gpio: add GPIO hogging mechanism")
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
Reviewed-by: default avatarAlexandre Courbot <acourbot@nvidia.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 030bbdbf

drivers/gpio/gpiolib.c

+6 −4
Original line number Diff line number Diff line
@@ -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