net: qualcomm: rmnet: drop some unary NOTs

We compare a payload checksum with a pseudo checksum value for
equality in rmnet_map_ipv4_dl_csum_trailer().  Both of those values
are computed with a unary NOT (~) operation.  The result of the
comparison is the same if we omit that NOT for both values.

Remove these operations in rmnet_map_ipv6_dl_csum_trailer() also.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
index 610c8b5..ed4737d 100644 (file)
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
@@ -87,11 +87,11 @@ rmnet_map_ipv4_dl_csum_trailer(struct sk_buff *skb,
         * header checksum value; it is already accounted for in the
         * checksum value found in the trailer.
         */
-       ip_payload_csum = ~csum_trailer->csum_value;
+       ip_payload_csum = csum_trailer->csum_value;
 
-       pseudo_csum = ~csum_tcpudp_magic(ip4h->saddr, ip4h->daddr,
-                                        ntohs(ip4h->tot_len) - ip4h->ihl * 4,
-                                        ip4h->protocol, 0);
+       pseudo_csum = csum_tcpudp_magic(ip4h->saddr, ip4h->daddr,
+                                       ntohs(ip4h->tot_len) - ip4h->ihl * 4,
+                                       ip4h->protocol, 0);
 
        /* The cast is required to ensure only the low 16 bits are examined */
        if (ip_payload_csum != (__sum16)~pseudo_csum) {
@@ -132,13 +132,13 @@ rmnet_map_ipv6_dl_csum_trailer(struct sk_buff *skb,
         * checksum computed over the pseudo header.
         */
        ip_header_csum = (__force __be16)ip_fast_csum(ip6h, sizeof(*ip6h) / 4);
-       ip6_payload_csum = ~csum16_sub(csum_trailer->csum_value, ip_header_csum);
+       ip6_payload_csum = csum16_sub(csum_trailer->csum_value, ip_header_csum);
 
        length = (ip6h->nexthdr == IPPROTO_UDP) ?
                 ntohs(((struct udphdr *)txporthdr)->len) :
                 ntohs(ip6h->payload_len);
-       pseudo_csum = ~csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
-                                      length, ip6h->nexthdr, 0);
+       pseudo_csum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
+                                     length, ip6h->nexthdr, 0);
 
        /* It's sufficient to compare the IP payload checksum with the
         * negated pseudo checksum to determine whether the packet