[IPV4/IPV6]: Remove frag_list check from output path.

I've removed the frag_list check before fragmenting and we'll
rely on dev_queue_xmit to fix things up if necessary.  Any
functions in between should do the right thing since they need
to handle non-linear skb's anyway.  Well that's the theory :)
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/ip_output.c

@@ -278,7 +278,7 @@ int ip_mc_output(struct sk_buff *skb)
 				newskb->dev, ip_dev_loopback_xmit);
 	}
 
-	if (skb->len > dst_pmtu(&rt->u.dst) || skb_shinfo(skb)->frag_list)
+	if (skb->len > dst_pmtu(&rt->u.dst))
 		return ip_fragment(skb, ip_finish_output);
 	else
 		return ip_finish_output(skb);
@@ -288,8 +288,7 @@ int ip_output(struct sk_buff *skb)
 {
 	IP_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
 
-	if ((skb->len > dst_pmtu(skb->dst) || skb_shinfo(skb)->frag_list) &&
-	    !skb_shinfo(skb)->tso_size)
+	if (skb->len > dst_pmtu(skb->dst) && !skb_shinfo(skb)->tso_size)
 		return ip_fragment(skb, ip_finish_output);
 	else
 		return ip_finish_output(skb);

net/ipv6/ip6_output.c

@@ -147,7 +147,7 @@ static int ip6_output2(struct sk_buff *skb)
 
 int ip6_output(struct sk_buff *skb)
 {
-	if ((skb->len > dst_pmtu(skb->dst) || skb_shinfo(skb)->frag_list))
+	if (skb->len > dst_pmtu(skb->dst))
 		return ip6_fragment(skb, ip6_output2);
 	else
 		return ip6_output2(skb);