netdev - [PATCH net-next] tcp: Split BUG_ON() in tcp_tso_should

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Date:   Fri,  5 Jan 2018 00:38:05 +0100
From:   Stefano Brivio <sbrivio@...hat.com>
To:     "David S . Miller" <davem@...emloft.net>
Cc:     Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org
Subject: [PATCH net-next] tcp: Split BUG_ON() in tcp_tso_should_defer() into two assertions

The two conditions triggering BUG_ON() are somewhat unrelated:
the tcp_skb_pcount() check is meant to catch TSO flaws, the
second one checks sanity of congestion window bookkeeping.

Split them into two separate BUG_ON() assertions on two lines,
so that we know which one actually triggers, when they do.

Signed-off-by: Stefano Brivio <sbrivio@...hat.com>
---
 net/ipv4/tcp_output.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 04be9f833927..95461f02ac9a 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1944,7 +1944,8 @@ static bool tcp_tso_should_defer(struct sock *sk, struct sk_buff *skb,

 	in_flight = tcp_packets_in_flight(tp);

-	BUG_ON(tcp_skb_pcount(skb) <= 1 || (tp->snd_cwnd <= in_flight));
+	BUG_ON(tcp_skb_pcount(skb) <= 1);
+	BUG_ON(tp->snd_cwnd <= in_flight);

 	send_win = tcp_wnd_end(tp) - TCP_SKB_CB(skb)->seq;

-- 
2.9.4