ipv4: gso: send_check() & segment() cleanups
inet_gso_segment() and inet_gso_send_check() are called by skb_mac_gso_segment() under rcu lock, no need to use rcu_read_lock() / rcu_read_unlock() Avoid calling ip_hdr() twice per function. We can use ip_send_check() helper. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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