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authorAlan Cox <alan@linux.intel.com>2011-08-26 11:28:11 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2011-08-26 11:01:14 -0700
commitf17141fdd407de78379222dd59d6f161437db4c8 (patch)
tree109e62b0085f745f9dd0710b1d746ace2ada53b5 /drivers/tty/n_gsm.c
parenta4c9fe8daf88b27f81be8022d49c073d37fe645e (diff)
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>
Diffstat (limited to 'drivers/tty/n_gsm.c')
-rw-r--r--drivers/tty/n_gsm.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index ed429082304..8d7766bfef8 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -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) {