NFS can reuse its TCP socket after calling tcp_disconnect().
We noticed window scaling was not negotiated in SYN packet of next
connection request.
Fix is to clear tp->window_clamp in tcp_disconnect().
Reported-by: Krzysztof Oledzki <ole@ans.pl>
Tested-by: Krzysztof Oledzki <ole@ans.pl>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>