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authorPhil Carmody <ext-phil.2.carmody@nokia.com>2009-12-14 18:00:29 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-15 08:53:27 -0800
commit603c4ba96be998a8dd7a6f9b23681c49acdf4b64 (patch)
tree1b85fc526219085ceaffca54150eee64c3aba4a0 /include
parent9385565e20c4acf97cd8e2fd7155750e578edcc4 (diff)
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err.h: add helper function to simplify pointer error checking
There are quite a few instances in the kernel of checks of pointers both against NULL and against the errno range, handling both cases identically. This additional helper function would simplify such code. [akpm@linux-foundation.org: build fix] Signed-off-by: Phil Carmody <ext-phil.2.carmody@nokia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/err.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/err.h b/include/linux/err.h
index ec87f3142bf3..1b12642636c7 100644
--- a/include/linux/err.h
+++ b/include/linux/err.h
@@ -34,6 +34,11 @@ static inline long IS_ERR(const void *ptr)
return IS_ERR_VALUE((unsigned long)ptr);
}
+static inline long IS_ERR_OR_NULL(const void *ptr)
+{
+ return !ptr || IS_ERR_VALUE((unsigned long)ptr);
+}
+
/**
* ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
* @ptr: The pointer to cast.