gpio: sysfs: fix gpio attribute-creation race
commit ebbeba12 upstream. Fix attribute-creation race with userspace by using the default group to create also the contingent gpio device attributes. Fixes: d8f388d8 ("gpio: sysfs interface") Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> [bwh: Backported to 3.2: - Adjust filenames, context - Use gpio_to_desc(), not gpiod_to_desc(), in gpio_is_visible() - gpio_is_visible() must return mode_t] Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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