tree 6b6a28e0fd8befd4bad5fb1474ce4e0dea9ed6dd
parent 3320eae51d6e4c65b4733bf4d87de3b833973a1f
author Eric Dumazet <eric.dumazet@gmail.com> 1259885173 -0800
committer David S. Miller <davem@davemloft.net> 1259885173 -0800

tcp: diag: Dont report negative values for rx queue

Both netlink and /proc/net/tcp interfaces can report transient
negative values for rx queue.

ss ->
State   Recv-Q Send-Q  Local Address:Port  Peer Address:Port
ESTAB   -6     6       127.0.0.1:45956     127.0.0.1:3333 

netstat ->
tcp   4294967290      6 127.0.0.1:37784  127.0.0.1:3333 ESTABLISHED

This is because we dont lock socket while computing 
tp->rcv_nxt - tp->copied_seq,
and another CPU can update copied_seq before rcv_next in RX path.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>