diff options
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/n_gsm.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c index 48e791d95f76..db6728c7d1a9 100644 --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -1451,6 +1451,10 @@ static void gsm_dlci_open(struct gsm_dlci *dlci) * in which case an opening port goes back to closed and a closing port * is simply put into closed state (any further frames from the other * end will get a DM response) + * + * Some control dlci can stay in ADM mode with other dlci working just + * fine. In that case we can just keep the control dlci open after the + * DLCI_OPENING retries time out. */ static void gsm_dlci_t1(struct timer_list *t) @@ -1464,8 +1468,15 @@ static void gsm_dlci_t1(struct timer_list *t) if (dlci->retries) { gsm_command(dlci->gsm, dlci->addr, SABM|PF); mod_timer(&dlci->t1, jiffies + gsm->t1 * HZ / 100); - } else + } else if (!dlci->addr && gsm->control == (DM | PF)) { + if (debug & 8) + pr_info("DLCI %d opening in ADM mode.\n", + dlci->addr); + gsm_dlci_open(dlci); + } else { gsm_dlci_close(dlci); + } + break; case DLCI_CLOSING: dlci->retries--; @@ -1483,8 +1494,8 @@ static void gsm_dlci_t1(struct timer_list *t) * @dlci: DLCI to open * * Commence opening a DLCI from the Linux side. We issue SABM messages - * to the modem which should then reply with a UA, at which point we - * will move into open state. Opening is done asynchronously with retry + * to the modem which should then reply with a UA or ADM, at which point + * we will move into open state. Opening is done asynchronously with retry * running off timers and the responses. */ |