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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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6
include/linux/gpio.h
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@@ -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;
}