gpio: fix memory and reference leaks in gpiochip_add error path

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")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 487afe6..89c59f5 100644 (file)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -277,6 +277,9 @@ 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
@@ -284,12 +287,12 @@ 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,