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| author | Atsushi Nemoto <anemo@mba.ocn.ne.jp> | 2007-01-24 15:43:34 +0900 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2007-01-24 19:23:22 +0000 |
| commit | 66218da212bf141532d678a699f5789c78145ab1 (patch) | |
| tree | 6ba949af13a6f07ceaa7a5e99c71dc513d860849 /include/asm-mips | |
| parent | 9cfdf6f15a2a462b6b328b4c60b252cfc04ec03e (diff) | |
| download | lwn-66218da212bf141532d678a699f5789c78145ab1.tar.gz lwn-66218da212bf141532d678a699f5789c78145ab1.zip | |
[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>
Diffstat (limited to 'include/asm-mips')
| -rw-r--r-- | include/asm-mips/checksum.h | 3 |
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 |