tcp: tcp_disconnect() should clear window_clamp
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: NKrzysztof Oledzki <ole@ans.pl> Tested-by: NKrzysztof Oledzki <ole@ans.pl> Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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