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-rw-r--r--Documentation/gpio.txt2
-rw-r--r--include/asm-generic/gpio.h10
-rw-r--r--include/linux/gpio.h6
3 files changed, 9 insertions, 9 deletions
diff --git a/Documentation/gpio.txt b/Documentation/gpio.txt
index 792faa3c06cf..a492d92bb098 100644
--- a/Documentation/gpio.txt
+++ b/Documentation/gpio.txt
@@ -135,7 +135,7 @@ setting up a platform_device using the GPIO, is mark its direction:
int gpio_direction_input(unsigned gpio);
int gpio_direction_output(unsigned gpio, int value);
-The return value is zero for success, else a negative errno. It should
+The return value is zero for success, else a negative errno. It must
be checked, since the get/set calls don't have error returns and since
misconfiguration is possible. You should normally issue these calls from
a task context. However, for spinlock-safe GPIOs it's OK to use them
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index ff5c66080c8c..6098cae2af8e 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -147,11 +147,11 @@ extern struct gpio_chip *gpiochip_find(void *data,
/* Always use the library code for GPIO management calls,
* or when sleeping may be involved.
*/
-extern int gpio_request(unsigned gpio, const char *label);
+extern int __must_check gpio_request(unsigned gpio, const char *label);
extern void gpio_free(unsigned gpio);
-extern int gpio_direction_input(unsigned gpio);
-extern int gpio_direction_output(unsigned gpio, int value);
+extern int __must_check gpio_direction_input(unsigned gpio);
+extern int __must_check gpio_direction_output(unsigned gpio, int value);
extern int gpio_set_debounce(unsigned gpio, unsigned debounce);
@@ -192,8 +192,8 @@ struct gpio {
const char *label;
};
-extern int gpio_request_one(unsigned gpio, unsigned long flags, const char *label);
-extern int gpio_request_array(struct gpio *array, size_t num);
+extern int __must_check gpio_request_one(unsigned gpio, unsigned long flags, const char *label);
+extern int __must_check gpio_request_array(struct gpio *array, size_t num);
extern void gpio_free_array(struct gpio *array, size_t num);
#ifdef CONFIG_GPIO_SYSFS
diff --git a/include/linux/gpio.h b/include/linux/gpio.h
index e41f7dd1ae67..1d5214a89110 100644
--- a/include/linux/gpio.h
+++ b/include/linux/gpio.h
@@ -29,7 +29,7 @@ static inline int gpio_is_valid(int number)
return 0;
}
-static inline int gpio_request(unsigned gpio, const char *label)
+static inline int __must_check gpio_request(unsigned gpio, const char *label)
{
return -ENOSYS;
}
@@ -42,12 +42,12 @@ static inline void gpio_free(unsigned gpio)
WARN_ON(1);
}
-static inline int gpio_direction_input(unsigned gpio)
+static inline int __must_check gpio_direction_input(unsigned gpio)
{
return -ENOSYS;
}
-static inline int gpio_direction_output(unsigned gpio, int value)
+static inline int __must_check gpio_direction_output(unsigned gpio, int value)
{
return -ENOSYS;
}