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path: root/drivers/tty/n_gsm.c
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Diffstat (limited to 'drivers/tty/n_gsm.c')
-rw-r--r--drivers/tty/n_gsm.c54
1 files changed, 35 insertions, 19 deletions
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index da830f833392..2afe5fce68e3 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -2015,6 +2015,33 @@ static void gsm_error(struct gsm_mux *gsm,
gsm->io_error++;
}
+static int gsm_disconnect(struct gsm_mux *gsm)
+{
+ struct gsm_dlci *dlci = gsm->dlci[0];
+ struct gsm_control *gc;
+
+ if (!dlci)
+ return 0;
+
+ /* In theory disconnecting DLCI 0 is sufficient but for some
+ modems this is apparently not the case. */
+ gc = gsm_control_send(gsm, CMD_CLD, NULL, 0);
+ if (gc)
+ gsm_control_wait(gsm, gc);
+
+ del_timer_sync(&gsm->t2_timer);
+ /* Now we are sure T2 has stopped */
+
+ gsm_dlci_begin_close(dlci);
+ wait_event_interruptible(gsm->event,
+ dlci->state == DLCI_CLOSED);
+
+ if (signal_pending(current))
+ return -EINTR;
+
+ return 0;
+}
+
/**
* gsm_cleanup_mux - generic GSM protocol cleanup
* @gsm: our mux
@@ -2029,7 +2056,6 @@ static void gsm_cleanup_mux(struct gsm_mux *gsm)
int i;
struct gsm_dlci *dlci = gsm->dlci[0];
struct gsm_msg *txq, *ntxq;
- struct gsm_control *gc;
gsm->dead = 1;
@@ -2045,21 +2071,11 @@ static void gsm_cleanup_mux(struct gsm_mux *gsm)
if (i == MAX_MUX)
return;
- /* In theory disconnecting DLCI 0 is sufficient but for some
- modems this is apparently not the case. */
- if (dlci) {
- gc = gsm_control_send(gsm, CMD_CLD, NULL, 0);
- if (gc)
- gsm_control_wait(gsm, gc);
- }
del_timer_sync(&gsm->t2_timer);
/* Now we are sure T2 has stopped */
- if (dlci) {
+ if (dlci)
dlci->dead = 1;
- gsm_dlci_begin_close(dlci);
- wait_event_interruptible(gsm->event,
- dlci->state == DLCI_CLOSED);
- }
+
/* Free up any link layer users */
mutex_lock(&gsm->mutex);
for (i = 0; i < NUM_DLCI; i++)
@@ -2519,12 +2535,12 @@ static int gsmld_config(struct tty_struct *tty, struct gsm_mux *gsm,
*/
if (need_close || need_restart) {
- gsm_dlci_begin_close(gsm->dlci[0]);
- /* This will timeout if the link is down due to N2 expiring */
- wait_event_interruptible(gsm->event,
- gsm->dlci[0]->state == DLCI_CLOSED);
- if (signal_pending(current))
- return -EINTR;
+ int ret;
+
+ ret = gsm_disconnect(gsm);
+
+ if (ret)
+ return ret;
}
if (need_restart)
gsm_cleanup_mux(gsm);