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tty: n_gsm: Delete gsmtty open SABM frame when config requester

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[ Upstream commit cbff2b32516881bef30bbebf413d1b49495bab1d ]

When n_gsm config "initiator=0",as requester ,it doesn't need to
send SABM frame data during gsmtty open.

Example,when gsmtty open,it will send SABM frame.for initiator,it
maybe not want to receive the frame.

[   88.410426] c1 gsmld_output: 00000000: f9 07 3f 01 de f9
[   88.420839] c1 --> 1) R: SABM(F)

Signed-off-by: Zhenguo Zhao <Zhenguo.Zhao1@unisoc.com>
Link: https://lore.kernel.org/r/1629461872-26965-6-git-send-email-zhenguo6858@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Zhenguo Zhao 2021-08-20 20:17:50 +08:00 committed by Greg Kroah-Hartman
parent d94a552183
commit 9e38020f17
1 changed files with 3 additions and 1 deletions
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4
drivers/tty/n_gsm.c
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@ -3024,6 +3024,7 @@ static int gsmtty_open(struct tty_struct *tty, struct file *filp)
{
struct gsm_dlci *dlci = tty->driver_data;
struct tty_port *port = &dlci->port;
struct gsm_mux *gsm = dlci->gsm;
port->count++;
tty_port_tty_set(port, tty);
@ -3033,7 +3034,8 @@ static int gsmtty_open(struct tty_struct *tty, struct file *filp)
a DM straight back. This is ok as that will have caused a hangup */
tty_port_set_initialized(port, 1);
/* Start sending off SABM messages */
gsm_dlci_begin_open(dlci);
if (gsm->initiator)
gsm_dlci_begin_open(dlci);
/* And wait for virtual carrier */
return tty_port_block_til_ready(port, tty, filp);
}