From fa9ee9c4b9885dfdf8eccac19b8b4fc8a7c53288 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= <u.kleine-koenig@pengutronix.de>
Date: Tue, 22 Mar 2011 16:34:05 -0700
Subject: [PATCH] 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>
---
include/linux/err.h | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/include/linux/err.h b/include/linux/err.h
index 448afc12c78a..f2edce25a76b 100644
--- a/include/linux/err.h
+++ b/include/linux/err.h
@@ -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 */
--
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