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n_gsm: Send CLD command on exit 

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@linux.intel.com>
Tested-by: Michael Lauer
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Cox 2011-08-26 11:28:11 +01:00 committed by Greg Kroah-Hartman
parent a4c9fe8daf
commit f17141fdd4
1 changed files with 8 additions and 0 deletions
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8
drivers/tty/n_gsm.c
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@ -2003,6 +2003,7 @@ 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;
@ -2016,6 +2017,13 @@ 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) {