[PATCH 3.16 097/366] net: bcmgenet: Fix sparse warnings in bcmgenet_put_tx_csum()

Ben Hutchings
2018-10-14T23:24:07Z

From: Florian Fainelli <f.fainelli@gmail.com>

commit 6f89421180f15867dc1472d9edf68f82b0ed5ee6 upstream.

skb->protocol is a __be16 which we would be calling htons() against,
while this is not wrong per-se as it correctly results in swapping the
value on LE hosts, this still upsets sparse. Adopt a similar pattern to
what other drivers do and just assign ip_ver to skb->protocol, and then
use htons() against the different constants such that the compiler can
resolve the values at build time.

Fixes: 1c1008c793fa ("net: bcmgenet: add main driver file")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/net/ethernet/broadcom/genet/bcmgenet.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)

--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -1093,7 +1093,7 @@ static int bcmgenet_put_tx_csum(struct n
struct sk_buff *new_skb;
u16 offset;
u8 ip_proto;
- u16 ip_ver;
+ __be16 ip_ver;
u32 tx_csum_info;

if (unlikely(skb_headroom(skb) < sizeof(*status))) {
@@ -1114,12 +1114,12 @@ static int bcmgenet_put_tx_csum(struct n
status = (struct status_64 *)skb->data;

if (skb->ip_summed == CHECKSUM_PARTIAL) {
- ip_ver = htons(skb->protocol);
+ ip_ver = skb->protocol;
switch (ip_ver) {
- case ETH_P_IP:
+ case htons(ETH_P_IP):
ip_proto = ip_hdr(skb)->protocol;
break;
- case ETH_P_IPV6:
+ case htons(ETH_P_IPV6):
ip_proto = ipv6_hdr(skb)->nexthdr;
break;
default:
@@ -1135,7 +1135,8 @@ static int bcmgenet_put_tx_csum(struct n
*/
if (ip_proto == IPPROTO_TCP || ip_proto == IPPROTO_UDP) {
tx_csum_info |= STATUS_TX_CSUM_LV;
- if (ip_proto == IPPROTO_UDP && ip_ver == ETH_P_IP)
+ if (ip_proto == IPPROTO_UDP &&
+ ip_ver == htons(ETH_P_IP))
tx_csum_info |= STATUS_TX_CSUM_PROTO_UDP;
} else
tx_csum_info = 0;