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Subject[PATCH v3] tty: n_gsm: delete DISC command frame as requester
Date
From: Zhenguo Zhao <Zhenguo.Zhao1@unisoc.com>

as initiator,it need to send DISC command ,as requester,there is
no need to send the DISC control frame,it will cause redundant data.

Signed-off-by: Zhenguo Zhao <Zhenguo.Zhao1@unisoc.com>
---
drivers/tty/n_gsm.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 5fea02c..f8e5935 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -2050,7 +2050,8 @@ static int gsm_disconnect(struct gsm_mux *gsm)
del_timer_sync(&gsm->t2_timer);
/* Now we are sure T2 has stopped */

- gsm_dlci_begin_close(dlci);
+ if (gsm->initiator)
+ gsm_dlci_begin_close(dlci);
wait_event_interruptible(gsm->event,
dlci->state == DLCI_CLOSED);

@@ -3014,6 +3015,7 @@ static int gsmtty_open(struct tty_struct *tty, struct file *filp)
static void gsmtty_close(struct tty_struct *tty, struct file *filp)
{
struct gsm_dlci *dlci = tty->driver_data;
+ struct gsm_mux *gsm = dlci->gsm;

if (dlci == NULL)
return;
@@ -3024,7 +3026,8 @@ static void gsmtty_close(struct tty_struct *tty, struct file *filp)
mutex_unlock(&dlci->mutex);
if (tty_port_close_start(&dlci->port, tty, filp) == 0)
return;
- gsm_dlci_begin_close(dlci);
+ if (gsm->initiator)
+ gsm_dlci_begin_close(dlci);
if (tty_port_initialized(&dlci->port) && C_HUPCL(tty))
tty_port_lower_dtr_rts(&dlci->port);
tty_port_close_end(&dlci->port, tty);
@@ -3035,10 +3038,12 @@ static void gsmtty_close(struct tty_struct *tty, struct file *filp)
static void gsmtty_hangup(struct tty_struct *tty)
{
struct gsm_dlci *dlci = tty->driver_data;
+ struct gsm_mux *gsm = dlci->gsm;
if (dlci->state == DLCI_CLOSED)
return;
tty_port_hangup(&dlci->port);
- gsm_dlci_begin_close(dlci);
+ if (gsm->initiator)
+ gsm_dlci_begin_close(dlci);
}

static int gsmtty_write(struct tty_struct *tty, const unsigned char *buf,
--
1.9.1
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