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authorAlexandre Courbot <acourbot@nvidia.com>2013-10-04 10:59:57 -0700
committerLinus Walleij <linus.walleij@linaro.org>2013-10-11 16:31:53 +0200
commit8c0fca8153224822121c85a64d6401903b9e4690 (patch)
tree188e0eb7c0e09ebe5eda090df9570c5a7348816f /drivers/gpio
parent03d152d5582abc8a1c19cb107164c3724bbd4be4 (diff)
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>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpiolib.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 86ef3461ec0..f33063114d5 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -136,7 +136,7 @@ static struct gpio_desc *gpio_to_desc(unsigned gpio)
*/
static int desc_to_gpio(const struct gpio_desc *desc)
{
- return desc->chip->base + gpio_chip_hwgpio(desc);
+ return desc - &gpio_desc[0];
}