ipv6: fix checksum annotation in udp6_csum_init

Cc: Tom Herbert <tom@herbertland.com>
Fixes: 4068579e1e098fa ("net: Implmement RFC 6936 (zero RX csums for UDP/IPv6")
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/ip6_checksum.c b/net/ipv6/ip6_checksum.c
index b2025bf3da4af20a19b61de59808d3ca91eead51..c0cbcb259f5a9acf9157d4626c61f532d8077855 100644 (file)
--- 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);