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net/lapb: fix t1 timer handling for LAPB_STATE_0 

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>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Martin Schiller 2020-11-26 07:35:55 +01:00 committed by Jakub Kicinski
parent a4989fa911
commit 62480b992b
1 changed files with 9 additions and 2 deletions
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11
net/lapb/lapb_timer.c
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@ -85,11 +85,18 @@ static void lapb_t1timer_expiry(struct timer_list *t)
switch (lapb->state) {
/*
* 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 != lapb->n2) {
lapb->n2count++;
lapb_send_control(lapb, LAPB_DM, LAPB_POLLOFF, LAPB_RESPONSE);
} else {
lapb->state = LAPB_STATE_1;
lapb_establish_data_link(lapb);
}
break;
/*