From: Alexandre Courbot <acourbot@nvidia.com>
Date: Fri, 4 Oct 2013 17:59:57 +0000 (-0700)
Subject: gpiolib: safer implementation of desc_to_gpio()
X-Git-Tag: v3.12-rc6~14^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8c0fca8153224822121c85a64d6401903b9e4690;p=pandora-kernel.git

gpiolib: safer implementation of desc_to_gpio()

The current implementation of desc_to_gpio() relies on the chip pointer
to be set to a valid value in order to compute the GPIO number. This
was done in the hope that we can get rid of the gpio_desc global array,
but this is not happening anytime soon.

This patch reimplements desc_to_gpio() in a fashion similar to that of
gpio_to_desc(). As a result, desc_to_gpio(gpio_to_desc(gpio)) == gpio is
now always true. This allows to call desc_to_gpio() on non-initialized
descriptors as some error-handling code currently does.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Reported-by: Dr. H. Nikolaus Schaller <hns@goldelico.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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