geneve, vxlan: Don't check skb_dst() twice

Commit f15ca723c1eb ("net: don't call update_pmtu unconditionally") avoids
that we try updating PMTU for a non-existent destination, but didn't clean
up cases where the check was already explicit. Drop those redundant checks.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 6 insertions, 21 deletions

diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index 6acb6b5718b9..61c4bfbeb41c 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -830,12 +830,8 @@ static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
         if (IS_ERR(rt))
                 return PTR_ERR(rt);
 
-        if (skb_dst(skb)) {
-                int mtu = dst_mtu(&rt->dst) - GENEVE_IPV4_HLEN -
-                          info->options_len;
-
-                skb_dst_update_pmtu(skb, mtu);
-        }
+        skb_dst_update_pmtu(skb, dst_mtu(&rt->dst) -
+                                 GENEVE_IPV4_HLEN - info->options_len);
 
         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
         if (geneve->collect_md) {
@@ -876,11 +872,8 @@ static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
         if (IS_ERR(dst))
                 return PTR_ERR(dst);
 
-        if (skb_dst(skb)) {
-                int mtu = dst_mtu(dst) - GENEVE_IPV6_HLEN - info->options_len;
-
-                skb_dst_update_pmtu(skb, mtu);
-        }
+        skb_dst_update_pmtu(skb, dst_mtu(dst) -
+                                 GENEVE_IPV6_HLEN - info->options_len);
 
         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
         if (geneve->collect_md) {
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 2b8da2b7e721..22e0ce592e07 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -2194,11 +2194,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
                 }
 
                 ndst = &rt->dst;
-                if (skb_dst(skb)) {
-                        int mtu = dst_mtu(ndst) - VXLAN_HEADROOM;
-
-                        skb_dst_update_pmtu(skb, mtu);
-                }
+                skb_dst_update_pmtu(skb, dst_mtu(ndst) - VXLAN_HEADROOM);
 
                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
@@ -2235,11 +2231,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
                                 goto out_unlock;
                 }
 
-                if (skb_dst(skb)) {
-                        int mtu = dst_mtu(ndst) - VXLAN6_HEADROOM;
-
-                        skb_dst_update_pmtu(skb, mtu);
-                }
+                skb_dst_update_pmtu(skb, dst_mtu(ndst) - VXLAN6_HEADROOM);
 
                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
                 ttl = ttl ? : ip6_dst_hoplimit(ndst);