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

[Martin Schiller]

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 <m...@dev.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