From: Johan Hovold <johan@kernel.org>
Date: Mon, 12 Jan 2015 16:12:25 +0000 (+0100)
Subject: gpio: fix gpio-chip list corruption
X-Git-Tag: fixes-v4.0-rc1~273^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=225fce83cb72e1bffb712a33ce47c210c770f8ab;p=pandora-kernel.git

gpio: fix gpio-chip list corruption

Fix potential corruption of gpio-chip list due to failure to remove the
chip from the list before returning in gpiochip_add error path.

The chip could be long gone when the global list is next traversed,
something which could lead to a null-pointer dereference. In the best
case (chip not deallocated) we are just leaking the gpio range.

Fixes: 14e85c0e69d5 ("gpio: remove gpio_descs global array")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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