From bd47d85d38ee5fb1fb8a37d006f51443f67a2061 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Thu, 14 Feb 2013 23:39:57 +0100
Subject: [PATCH] utils: make le16 endian conversion functions work with
 arguments that have side effects

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
---
 utils.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/utils.h b/utils.h
index 41ea02c..71a4692 100644
--- a/utils.h
+++ b/utils.h
@@ -99,7 +99,7 @@ void clock_gettime(int type, struct timespec *tv);
 #define __LITTLE_ENDIAN LITTLE_ENDIAN
 #endif
 
-#define __u_bswap16(x) ((uint16_t)((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8)))
+#define __u_bswap16(x) ({ uint16_t val = (x); ((uint16_t)(((val >> 8) & 0xffu) | ((val & 0xffu) << 8))); })
 
 #if _GNUC_MIN_VER(4, 2)
 #define __u_bswap32(x) __builtin_bswap32(x)