gpio: fix memory and reference leaks in gpiochip_add error path

commit 5539b3c938d64a60cb1fc442ac3ce9263d52de0c upstream.

Memory allocated and references taken by of_gpiochip_add and
acpi_gpiochip_add were never released on errors in gpiochip_add (e.g.
failure to find free gpio range).

Fixes: 391c970c0dd1 ("of/gpio: add default of_xlate function if device
has a node pointer")
Fixes: 664e3e5ac64c ("gpio / ACPI: register to ACPI events
automatically")

Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index e8e98ca25ec7e468c95164a791866ae477f74f2b..c44f75183384f037fe350dc87879466af055f3c9 100644 (file)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -268,6 +268,9 @@ int gpiochip_add(struct gpio_chip *chip)
 
        spin_unlock_irqrestore(&gpio_lock, flags);
 
+       if (status)
+               goto fail;
+
 #ifdef CONFIG_PINCTRL
        INIT_LIST_HEAD(&chip->pin_ranges);
 #endif
@@ -275,12 +278,12 @@ int gpiochip_add(struct gpio_chip *chip)
        of_gpiochip_add(chip);
        acpi_gpiochip_add(chip);
 
-       if (status)
-               goto fail;
-
        status = gpiochip_export(chip);
-       if (status)
+       if (status) {
+               acpi_gpiochip_remove(chip);
+               of_gpiochip_remove(chip);
                goto fail;
+       }
 
        pr_debug("%s: registered GPIOs %d to %d on device: %s\n", __func__,
                chip->base, chip->base + chip->ngpio - 1,