From: Alan Cox <alan@xxxxxxxxxxxxxxx>
A DISC on DLCI 0 should close down the mux but Michael Lauer reports this
is not the case for some modems. Send a CLD as well.
Signed-off-by: Alan Cox <alan@xxxxxxxxxxxxxxx>
Tested-by: Michael Lauer
---
drivers/tty/n_gsm.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 8f03ea7..b90638c 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -2005,6 +2005,7 @@ void gsm_cleanup_mux(struct gsm_mux *gsm)
int i;
struct gsm_dlci *dlci = gsm->dlci[0];
struct gsm_msg *txq;
+ struct gsm_control *gc;
gsm->dead = 1;
@@ -2018,6 +2019,13 @@ void gsm_cleanup_mux(struct gsm_mux *gsm)
spin_unlock(&gsm_mux_lock);
WARN_ON(i == MAX_MUX);
+ /* 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) {
--
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