From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Date: Mon, 26 Sep 2016 09:54:15 +0000 (+0200)
Subject: gpio: pca953x: add a comment explaining the need for a lockdep subclass
X-Git-Tag: v4.9-rc1~17^2~1
X-Git-Url: http://git.cascardo.info/?p=cascardo%2Flinux.git;a=commitdiff_plain;h=74f47f07e53daeca1d16812fa7c9bf3145bd8216;hp=74f47f07e53daeca1d16812fa7c9bf3145bd8216

gpio: pca953x: add a comment explaining the need for a lockdep subclass

This is a follow-up to commit 559b46990e76 ("gpio: pca953x: fix an
incorrect lockdep warning"). The reason for calling
lockdep_set_subclass() in pca953x_probe() is not explained in
the code.

Add a comment describing the problem, partial solution and required
future extensions.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
---