diff options
| author | Zhenguo Zhao <Zhenguo.Zhao1@unisoc.com> | 2021-08-20 15:17:50 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-21 16:16:06 +0300 |
| commit | 9e38020f17009c53b0f28347ec06102929b8962c (patch) | |
| tree | ac9eeb7d811cc1417cd6c6a120a73acb94d4bb16 /drivers | |
| parent | d94a552183c0fde0c65ebdf5ed74bd9fb1dc55c4 (diff) | |
| download | linux-9e38020f17009c53b0f28347ec06102929b8962c.tar.xz | |
tty: n_gsm: Delete gsmtty open SABM frame when config requester
[ 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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/tty/n_gsm.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c index b05b7862778c..405b55bceba8 100644 --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -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); } |