[linux-yocto] [PATCH 5/5] gre6: Call skb_checksum_simple_validate

[jianchuan.wang at windriver.com]

From: Tom Herbert <therbert at google.com>

commit 81249bea1fb003b6fcbc1709dd5a5fc1e26e168d upstream 

Use skb_checksum_simple_validate to verify checksum.

Signed-off-by: Tom Herbert <therbert at google.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Jianchuan Wang <jianchuan.wang at windriver.com> 
---
 net/ipv6/ip6_gre.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index 084bde3..4f7f364 100644
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -468,17 +468,7 @@ static int ip6gre_rcv(struct sk_buff *skb)
 			goto drop;
 
 		if (flags&GRE_CSUM) {
-			switch (skb->ip_summed) {
-			case CHECKSUM_COMPLETE:
-				csum = csum_fold(skb->csum);
-				if (!csum)
-					break;
-				/* fall through */
-			case CHECKSUM_NONE:
-				skb->csum = 0;
-				csum = __skb_checksum_complete(skb);
-				skb->ip_summed = CHECKSUM_COMPLETE;
-			}
+			csum = skb_checksum_simple_validate(skb);
 			offset += 4;
 		}
 		if (flags&GRE_KEY) {
-- 
1.9.1