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authorAtsushi Nemoto <anemo@mba.ocn.ne.jp>2007-01-24 15:43:34 +0900
committerRalf Baechle <ralf@linux-mips.org>2007-01-24 19:23:22 +0000
commit66218da212bf141532d678a699f5789c78145ab1 (patch)
tree6ba949af13a6f07ceaa7a5e99c71dc513d860849
parent9cfdf6f15a2a462b6b328b4c60b252cfc04ec03e (diff)
[MIPS] Fix wrong checksum calculation on 64-bit MIPS
The commit 8e3d8433d8c22ca6c42cba4a67d300c39aae7822 ([NET]: MIPS checksum annotations and cleanups) broke 64-bit MIPS. The problem is the commit replaces some unsigned long with __be32. On 64bit MIPS, a __be32 (i.e. unsigned int) value is represented as a sign-extented 32-bit value in a 64-bit argument register. So the address 192.168.0.1 (0xc0a80001) is passed as 0xffffffffc0a80001 to csum_tcpudp_nofold() but the asm code in the function expects 0x00000000c0a80001, therefore it returns a wrong checksum. Explicit cast to unsigned long is needed to drop high 32bit. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
-rw-r--r--include/asm-mips/checksum.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/asm-mips/checksum.h b/include/asm-mips/checksum.h
index 24cdcc6eaab8..20a81e1548f5 100644
--- a/include/asm-mips/checksum.h
+++ b/include/asm-mips/checksum.h
@@ -159,7 +159,8 @@ static inline __wsum csum_tcpudp_nofold(__be32 saddr,
#endif
" .set pop"
: "=r" (sum)
- : "0" (daddr), "r"(saddr),
+ : "0" ((__force unsigned long)daddr),
+ "r" ((__force unsigned long)saddr),
#ifdef __MIPSEL__
"r" ((proto + len) << 8),
#else

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