Eric Dumazet ee2aabd3fc
tcp: refine tcp_write_queue_empty() implementation ...
Due to how tcp_sendmsg() is implemented, we can have an empty
skb at the tail of the write queue.
Most [1] tcp_write_queue_empty() callers want to know if there is
anything to send (payload and/or FIN)
Instead of checking if the sk_write_queue is empty, we need
to test if tp->write_seq == tp->snd_nxt
[1] tcp_send_fin() was the only caller that expected to
see if an skb was in the write queue, I have changed the code
to reuse the tcp_write_queue_tail() result.
Signed-off-by: Eric Dumazet <edumazet@google.com >
Cc: Neal Cardwell <ncardwell@google.com >
Acked-by: Soheil Hassas Yeganeh <soheil@google.com >
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com >
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