gpio: fix gpio-device list corruption
Make sure to hold the gpio_lock when removing the gpio device from the gpio_devices list (when dropping the last reference) to avoid corrupting the list when there are concurrent accesses. Fixes: ff2b1359 ("gpio: make the gpiochip a real device") Cc: stable@vger.kernel.org # 4.6 Reviewed-by: NSaravana Kannan <saravanak@google.com> Signed-off-by: NJohan Hovold <johan@kernel.org> Signed-off-by: NBartosz Golaszewski <bgolaszewski@baylibre.com>
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