netdev - [PATCH] net: tcp: add correct check for tcp_retransmit

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Date:   Mon, 26 Nov 2018 15:05:50 +0530
From:   Sharath Chandra Vurukala <sharathv@...eaurora.org>
To:     netdev@...r.kernel.org
Cc:     kapandey@...eaurora.org, chinagar@...eaurora.org
Subject: [PATCH] net: tcp: add correct check for tcp_retransmit_skb()

when the tcp_retranmission_timer expires and tcp_retranmsit_skb is
called if the retranmsission fails due to local congestion,
backoff should not incremented.

tcp_retransmit_skb() returns non-zero negative value in some cases of
failure but the caller tcp_retransmission_timer() has a check for
failure which checks if the return value is greater than zero.
The check is corrected to check for non-zero value.

Change-Id: I494fed73b2e385216402c91e9558d5c2884add5b
Signed-off-by: Sharath Chandra Vurukala <sharathv@...eaurora.org>
---
 net/ipv4/tcp_timer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index 4be66e4..a70b4a9 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -536,7 +536,7 @@ void tcp_retransmit_timer(struct sock *sk)

 	tcp_enter_loss(sk);

-	if (tcp_retransmit_skb(sk, tcp_write_queue_head(sk), 1) > 0) {
+	if (tcp_retransmit_skb(sk, tcp_write_queue_head(sk), 1) != 0) {
 		/* Retransmission failed because of local congestion,
 		 * do not backoff.
 		 */
-- 
1.9.1