netdev - [PATCH] appletalk/ddp.c: Neaten checksum function

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Message-ID: <1257366373.18982.25.camel@Joe-Laptop.home>
Date:	Wed, 04 Nov 2009 12:26:13 -0800
From:	Joe Perches <joe@...ches.com>
To:	netdev <netdev@...r.kernel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH] appletalk/ddp.c: Neaten checksum function

atalk_sum_partial can now use the rol16 function in bitops.h

Signed-off-by: Joe Perches <joe@...ches.com>

diff --git a/net/appletalk/ddp.c b/net/appletalk/ddp.c
index abe3801..e6903db 100644
--- a/net/appletalk/ddp.c
+++ b/net/appletalk/ddp.c
@@ -922,13 +922,8 @@ 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 <<= 1;
-		if (sum & 0x10000) {
-			sum++;
-			sum &= 0xffff;
-		}
-		data++;
+		sum += *data++;
+		sum = rol16(sum, 1);
 	}
 	return sum;
 }


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