appletalk/ddp.c: Neaten checksum function

atalk_sum_partial can now use the rol16 function in bitops.h

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 7 deletions

diff --git a/net/appletalk/ddp.c b/net/appletalk/ddp.c
index 31fca64d17a..b631cc73454 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;
 }