net: systemport: Fix sparse warnings in bcm_sysport_insert_tsb()

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: 80105befdb4b ("net: systemport: add Broadcom SYSTEMPORT Ethernet MAC driver")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/bcmsysport.c b/drivers/net/ethernet/broadcom/bcmsysport.c
index 4a75b1d..f9a3c1a 100644 (file)
--- a/drivers/net/ethernet/broadcom/bcmsysport.c
+++ b/drivers/net/ethernet/broadcom/bcmsysport.c
@@ -1192,7 +1192,7 @@ static struct sk_buff *bcm_sysport_insert_tsb(struct sk_buff *skb,
        u32 csum_info;
        u8 ip_proto;
        u16 csum_start;
-       u16 ip_ver;
+       __be16 ip_ver;
 
        /* Re-allocate SKB if needed */
        if (unlikely(skb_headroom(skb) < sizeof(*tsb))) {
@@ -1211,12 +1211,12 @@ static struct sk_buff *bcm_sysport_insert_tsb(struct sk_buff *skb,
        memset(tsb, 0, sizeof(*tsb));
 
        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:
@@ -1230,7 +1230,8 @@ static struct sk_buff *bcm_sysport_insert_tsb(struct sk_buff *skb,
 
                if (ip_proto == IPPROTO_TCP || ip_proto == IPPROTO_UDP) {
                        csum_info |= L4_LENGTH_VALID;
-                       if (ip_proto == IPPROTO_UDP && ip_ver == ETH_P_IP)
+                       if (ip_proto == IPPROTO_UDP &&
+                           ip_ver == htons(ETH_P_IP))
                                csum_info |= L4_UDP;
                } else {
                        csum_info = 0;