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

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: 79a9becda894 ("gpiolib: export descriptor-based GPIO interface")
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index ed070512b40eed97a99b1b837b5b980584d3a9b3..3b01fbcafc945132ecf87e949a6f051c6c1a54e7 100644 (file)
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -505,7 +505,7 @@ static inline int gpiod_set_consumer_name(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)