diff options
| author | Alexandre Courbot <acourbot@nvidia.com> | 2014-11-25 11:16:31 +0300 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2014-11-28 16:43:36 +0300 |
| commit | 8e53b0f190af2954309bbad76a78177ead15d824 (patch) | |
| tree | 51c650de7dbdb9672c3cba25a6bf03baaf033137 /drivers/gpio/gpiolib.c | |
| parent | 14e85c0e69d5c7fdbd963edbbec1dc5cdd385200 (diff) | |
| download | linux-8e53b0f190af2954309bbad76a78177ead15d824.tar.xz | |
gpio: remove const modifier from gpiod_get_direction()
Although gpiod_get_direction() can be considered side-effect free for
consumers, its internals involve setting or clearing bits in the
affected GPIO descriptor, for which we need to force-cast the const
descriptor variable to non-const. This could lead to incorrect behavior
if the compiler decides to optimize here, so remove this const
attribute. The intent is to make gpiod_get_direction() private anyway,
so it does not really matter.
Reported-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpiolib.c')
| -rw-r--r-- | drivers/gpio/gpiolib.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 5619922ebf44..0b271ef87c09 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -148,7 +148,7 @@ static int gpiochip_find_base(int ngpio) * * This function may sleep if gpiod_cansleep() is true. */ -int gpiod_get_direction(const struct gpio_desc *desc) +int gpiod_get_direction(struct gpio_desc *desc) { struct gpio_chip *chip; unsigned offset; @@ -164,13 +164,11 @@ int gpiod_get_direction(const struct gpio_desc *desc) if (status > 0) { /* GPIOF_DIR_IN, or other positive */ status = 1; - /* FLAG_IS_OUT is just a cache of the result of get_direction(), - * so it does not affect constness per se */ - clear_bit(FLAG_IS_OUT, &((struct gpio_desc *)desc)->flags); + clear_bit(FLAG_IS_OUT, &desc->flags); } if (status == 0) { /* GPIOF_DIR_OUT */ - set_bit(FLAG_IS_OUT, &((struct gpio_desc *)desc)->flags); + set_bit(FLAG_IS_OUT, &desc->flags); } return status; } |