From: Vlad Yasevich <vladislav.yasevich@hp.com>
Date: Thu, 22 Jan 2009 22:52:23 +0000 (-0800)
Subject: sctp: Fix crc32c calculations on big-endian arhes.
X-Git-Tag: v2.6.28.6~34
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=3d137641bbf5fcd5f45ceba31ea9f7d6f01fb22d;p=karo-tx-linux.git

sctp: Fix crc32c calculations on big-endian arhes.

[ Upstream commit 9c5ff5f75d0d0a1c7928ecfae3f38418b51a88e3 ]

crc32c algorithm provides a byteswaped result.  On little-endian
arches, the result ends up in big-endian/network byte order.
On big-endinan arches, the result ends up in little-endian
order and needs to be byte swapped again.  Thus calling cpu_to_le32
gives the right output.

Tested-by: Jukka Taimisto <jukka.taimisto@mail.suomi.net>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/include/net/sctp/checksum.h b/include/net/sctp/checksum.h
index b799fb21519a..2fec3c366e81 100644
--- a/include/net/sctp/checksum.h
+++ b/include/net/sctp/checksum.h
@@ -79,5 +79,5 @@ static inline __be32 sctp_update_cksum(__u8 *buffer, __u16 length, __be32 crc32)
 
 static inline __be32 sctp_end_cksum(__be32 crc32)
 {
-	return ~crc32;
+	return (__force __be32)~cpu_to_le32((__force u32)crc32);
 }