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gpiolib: Fix return value of gpio_to_desc() stub if !GPIOLIB

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[ Upstream commit c5510b8dafce5f3f5a039c9b262ebcae0092c462 ]

If CONFIG_GPOILIB is not set, the stub of gpio_to_desc() should return
the same type of error as regular version: NULL.  All the callers
compare the return value of gpio_to_desc() against NULL, so returned
ERR_PTR would be treated as non-error case leading to dereferencing of
error value.

Fixes: 79a9becda8 ("gpiolib: export descriptor-based GPIO interface")
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Krzysztof Kozlowski 2018-12-06 10:45:49 +01:00 • committed by Greg Kroah-Hartman
parent c2dfd69c86
commit c4c41610a3
1 changed files with 1 additions and 1 deletions
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2
include/linux/gpio/consumer.h
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@ -398,7 +398,7 @@ static inline int gpiod_to_irq(const struct gpio_desc *desc)
static inline struct gpio_desc *gpio_to_desc(unsigned gpio)
{
return ERR_PTR(-EINVAL);
return NULL;
}
static inline int desc_to_gpio(const struct gpio_desc *desc)