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gpiolib: don't allow OPEN_DRAIN & OPEN_SOURCE flags for input

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OPEN_DRAIN and OPEN_SOURCE flags only affect the way we drive a GPIO
line, so they only make sense for output mode. Just as we only allow
input mode for event handle requests, don't allow passing open-drain
and open-source flags for any other mode than explicit output.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Bartosz Golaszewski 2017-10-16 11:32:30 +02:00 committed by Linus Walleij
parent 418ee8e91f
commit 609aaf6a60
1 changed files with 6 additions and 0 deletions
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6
drivers/gpio/gpiolib.c
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@ -457,6 +457,12 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
if (lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS) if (lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS)
return -EINVAL; return -EINVAL;
/* OPEN_DRAIN and OPEN_SOURCE flags only make sense for output mode. */
if (!(lflags & GPIOHANDLE_REQUEST_OUTPUT) &&
((lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) ||
(lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE)))
return -EINVAL;
lh = kzalloc(sizeof(*lh), GFP_KERNEL); lh = kzalloc(sizeof(*lh), GFP_KERNEL);
if (!lh) if (!lh)
return -ENOMEM; return -ENOMEM;