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[TCP]: Update comment about highest_sack validity
This stale info came from the original idea, which proved to be unnecessarily complex, sacked_out > 0 is easy to do and that when it's going to be needed anyway (it _can_ be valid also when sacked_out == 0 but there's not going to be a guarantee about it for now). Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -332,7 +332,8 @@ struct tcp_sock {
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struct tcp_sack_block_wire recv_sack_cache[4];
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u32 highest_sack; /* Start seq of globally highest revd SACK (valid only in slowpath) */
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u32 highest_sack; /* Start seq of globally highest revd SACK
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* (validity guaranteed only if sacked_out > 0) */
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/* from STCP, retrans queue hinting */
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struct sk_buff* lost_skb_hint;
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