linux-kernel - [PATCH net-next v3 3/6] net/lapb: handle carrier loss correctly

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Date:   Wed, 18 Nov 2020 14:59:16 +0100
From:   Martin Schiller <ms@....tdt.de>
To:     andrew.hendry@...il.com, davem@...emloft.net, kuba@...nel.org,
        xie.he.0141@...il.com
Cc:     linux-x25@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Martin Schiller <ms@....tdt.de>
Subject: [PATCH net-next v3 3/6] net/lapb: handle carrier loss correctly

In case of carrier loss, clear all queues, enter state LABB_STATE_0 and
stop all timers.

By setting rc = LAPB_NOTCONNECTED, the upper layer is informed about the
disconnect.

Signed-off-by: Martin Schiller <ms@....tdt.de>
---
 net/lapb/lapb_iface.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/net/lapb/lapb_iface.c b/net/lapb/lapb_iface.c
index 8dd7c420ae93..017bc169c334 100644
--- a/net/lapb/lapb_iface.c
+++ b/net/lapb/lapb_iface.c
@@ -303,6 +303,18 @@ int lapb_disconnect_request(struct net_device *dev)
 	if (!lapb)
 		goto out;
 
+	if (!netif_carrier_ok(dev)) {
+		lapb_dbg(0, "(%p) Carrier lost!\n", lapb->dev);
+		lapb_dbg(0, "(%p) S%d -> S0\n", lapb->dev, lapb->state);
+		lapb_clear_queues(lapb);
+		lapb->state = LAPB_STATE_0;
+		lapb->n2count = 0;
+		lapb_stop_t1timer(lapb);
+		lapb_stop_t2timer(lapb);
+		rc = LAPB_NOTCONNECTED;
+		goto out_put;
+	}
+
 	switch (lapb->state) {
 	case LAPB_STATE_0:
 		rc = LAPB_NOTCONNECTED;
-- 
2.20.1