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authorWolfram Sang <w.sang@pengutronix.de>2011-01-12 20:00:23 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-13 11:03:14 -0500
commit0fdae42d361bbb431ca0ab0efed5126a94821177 (patch)
tree958a045aca3e40ca487dac67597496a7ed885115 /include/linux/gpio.h
parent49a367937fe4250144e24440e5a11ae4344202b1 (diff)
gpiolib: annotate gpio-intialization with __must_check
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>
Diffstat (limited to 'include/linux/gpio.h')
-rw-r--r--include/linux/gpio.h6
1 files changed, 3 insertions, 3 deletions
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)
29 return 0; 29 return 0;
30} 30}
31 31
32static inline int gpio_request(unsigned gpio, const char *label) 32static inline int __must_check gpio_request(unsigned gpio, const char *label)
33{ 33{
34 return -ENOSYS; 34 return -ENOSYS;
35} 35}
@@ -42,12 +42,12 @@ static inline void gpio_free(unsigned gpio)
42 WARN_ON(1); 42 WARN_ON(1);
43} 43}
44 44
45static inline int gpio_direction_input(unsigned gpio) 45static inline int __must_check gpio_direction_input(unsigned gpio)
46{ 46{
47 return -ENOSYS; 47 return -ENOSYS;
48} 48}
49 49
50static inline int gpio_direction_output(unsigned gpio, int value) 50static inline int __must_check gpio_direction_output(unsigned gpio, int value)
51{ 51{
52 return -ENOSYS; 52 return -ENOSYS;
53} 53}