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| author |   James Hogan <james.hogan@imgtec.com> | 2013-07-08 12:21:47 +0100 |
|---|---|---|
| committer | James Hogan <james.hogan@imgtec.com> | 2013-07-09 11:09:17 +0100 |
| commit | d903bca9bc542bd6d60019f9f761be15ad79c956 (patch) | |
| tree | 510a51eccad4bf34a01cad162179817a0d793af1 /arch/metag | |
| parent | Linux 3.10 (diff) | |
| download | linux-dev-d903bca9bc542bd6d60019f9f761be15ad79c956.tar.xz linux-dev-d903bca9bc542bd6d60019f9f761be15ad79c956.zip | |
metag: checksum.h: fix carry in csum_tcpudp_nofold
In csum_tcpudp_nofold, add 1 if the carry bit is set after adding the
destination IP address (32 bits) to the checksum (16 bits).
The lack of carry handling for this particular addition meant that a
destination address of *.*.255.255 (e.g. certain broadcasts) sometimes
resulted in an incorrect checksum. This bug has been present in the Meta
port since the code was written in the 2.4 days.
Reported-by: Marcin Nowakowski <Marcin.Nowakowski@pure.com>
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Diffstat (limited to 'arch/metag')
| -rw-r--r-- | arch/metag/include/asm/checksum.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/metag/include/asm/checksum.h b/arch/metag/include/asm/checksum.h index 999bf761a732..08dd1cc65799 100644 --- a/arch/metag/include/asm/checksum.h +++ b/arch/metag/include/asm/checksum.h @@ -64,7 +64,8 @@ static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __wsum sum) { unsigned long len_proto = (proto + len) << 8; - asm ("ADD %0, %0, %1\n" + asm ("ADDS %0, %0, %1\n" + "ADDCS %0, %0, #1\n" "ADDS %0, %0, %2\n" "ADDCS %0, %0, #1\n" "ADDS %0, %0, %3\n" |