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gpiolib: annotate gpio-intialization with __must_check

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Because GPIOs can have crucial functions especially in embedded systems,
we are better safe than sorry regarding their configuration.  For
gpio_request, the documentation is simply enforced: <quote>"The return
value of gpio_request() must be checked."</quote> For gpio_direction_* and
gpio_request_*, we now act accordingly.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: Greg KH <gregkh@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wolfram Sang
2011-01-12 17:00:23 -08:00
committed by Linus Torvalds
parent 49a367937f
commit 0fdae42d36
3 changed files with 9 additions and 9 deletions
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10
include/asm-generic/gpio.h
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@@ -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