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include/linux/err.h: add a function to cast error-pointers to a return value

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PTR_RET() can be used if you have an error-pointer and are only interested
in the eventual error value, but not the pointer.  Yields the usual 0 for
no error, -ESOMETHING otherwise.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Uwe Kleine-König 2011-03-22 16:34:05 -07:00 committed by Linus Torvalds
parent d404ab0a11
commit fa9ee9c4b9
1 changed files with 8 additions and 0 deletions
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include/linux/err.h
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@ -52,6 +52,14 @@ static inline void * __must_check ERR_CAST(const void *ptr)
return (void *) ptr;
}
static inline int __must_check PTR_RET(const void *ptr)
{
if (IS_ERR(ptr))
return PTR_ERR(ptr);
else
return 0;
}
#endif
#endif /* _LINUX_ERR_H */