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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>
This commit is contained in:
James Hogan 2013-07-08 12:21:47 +01:00
parent 8bb495e3f0
commit d903bca9bc
1 changed files with 2 additions and 1 deletions
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3
arch/metag/include/asm/checksum.h
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@ -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"