netdev - [PATCH net v2] ipv6: fix checksum annotation in udp6_csum

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Date:	Sat, 11 Jun 2016 21:15:37 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	netdev@...r.kernel.org
Cc:	Tom Herbert <tom@...bertland.com>
Subject: [PATCH net v2] ipv6: fix checksum annotation in udp6_csum_init

Cc: Tom Herbert <tom@...bertland.com>
Fixes: 4068579e1e098fa ("net: Implmement RFC 6936 (zero RX csums for UDP/IPv6")
Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
---
 net/ipv6/ip6_checksum.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/net/ipv6/ip6_checksum.c b/net/ipv6/ip6_checksum.c
index b2025bf3da4af2..c0cbcb259f5a9a 100644
--- a/net/ipv6/ip6_checksum.c
+++ b/net/ipv6/ip6_checksum.c
@@ -78,9 +78,12 @@ int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto)
 	 * we accept a checksum of zero here. When we find the socket
 	 * for the UDP packet we'll check if that socket allows zero checksum
 	 * for IPv6 (set by socket option).
+	 *
+	 * Note, we are only interested in != 0 or == 0, thus the
+	 * force to int.
 	 */
-	return skb_checksum_init_zero_check(skb, proto, uh->check,
-					   ip6_compute_pseudo);
+	return (__force int)skb_checksum_init_zero_check(skb, proto, uh->check,
+							 ip6_compute_pseudo);
 }
 EXPORT_SYMBOL(udp6_csum_init);
 
-- 
2.5.5