From 730228092ed7d2fbc1ef2f1902de70d5b84cae7b Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@nuts.ninka.net>
Date: Thu, 30 Oct 2003 03:43:04 -0800
Subject: [PATCH] [IPX]: Fix checksum computation.

---
 net/appletalk/ddp.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/net/appletalk/ddp.c b/net/appletalk/ddp.c
index 760eb26db9f5d..48497a95ff654 100644
--- a/net/appletalk/ddp.c
+++ b/net/appletalk/ddp.c
@@ -937,9 +937,13 @@ static unsigned long atalk_sum_partial(const unsigned char *data,
 {
 	/* This ought to be unwrapped neatly. I'll trust gcc for now */
 	while (len--) {
-		sum += *data++;
+		sum += *data;
 		sum <<= 1;
-		sum = ((sum >> 16) + sum) & 0xFFFF;
+		if (sum & 0x10000) {
+			sum++;
+			sum &= 0xffff;
+		}
+		data++;
 	}
 	return sum;
 }
-- 
2.53.0