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From:   Martin Schiller <ms@dev.tdt.de>
To:     andrew.hendry@gmail.com, davem@davemloft.net, kuba@kernel.org,
        xie.he.0141@gmail.com
Cc:     linux-x25@vger.kernel.org, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, Martin Schiller <ms@dev.tdt.de>
Subject: [PATCH net-next v6 3/5] net/lapb: fix t1 timer handling for LAPB_STATE_0
Date:   Tue, 24 Nov 2020 10:39:36 +0100
Message-ID: <20201124093938.22012-4-ms@dev.tdt.de>
In-Reply-To: <20201124093938.22012-1-ms@dev.tdt.de>
References: <20201124093938.22012-1-ms@dev.tdt.de>
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1. DTE interface changes immediately to LAPB_STATE_1 and start sending
   SABM(E).

2. DCE interface sends N2-times DM and changes to LAPB_STATE_1
   afterwards if there is no response in the meantime.

Signed-off-by: Martin Schiller <ms@dev.tdt.de>
---
 net/lapb/lapb_timer.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/net/lapb/lapb_timer.c b/net/lapb/lapb_timer.c
index 8f5b17001a07..baa247fe4ed0 100644
--- a/net/lapb/lapb_timer.c
+++ b/net/lapb/lapb_timer.c
@@ -85,11 +85,18 @@ static void lapb_t1timer_expiry(struct timer_list *t)
 	switch (lapb->state) {
=20
 		/*
-		 *	If we are a DCE, keep going DM .. DM .. DM
+		 *	If we are a DCE, send DM up to N2 times, then switch to
+		 *	STATE_1 and send SABM(E).
 		 */
 		case LAPB_STATE_0:
-			if (lapb->mode & LAPB_DCE)
+			if (lapb->mode & LAPB_DCE &&
+			    lapb->n2count !=3D lapb->n2) {
+				lapb->n2count++;
 				lapb_send_control(lapb, LAPB_DM, LAPB_POLLOFF, LAPB_RESPONSE);
+			} else {
+				lapb->state =3D LAPB_STATE_1;
+				lapb_establish_data_link(lapb);
+			}
 			break;
=20
 		/*
--=20
2.20.1