diff options
| author | Daniel Starke <daniel.starke@siemens.com> | 2022-04-20 03:13:44 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-04-20 16:52:25 +0200 |
| commit | 48473802506d2d6151f59e0e764932b33b53cb3b (patch) | |
| tree | 76aaaa1dd9f81cfc4ed1ea638f076553dfeb304e /drivers/tty/n_gsm.c | |
| parent | cc994bb97587787b8f0c094a9bc6945d82075b1d (diff) | |
| download | linux-48473802506d2d6151f59e0e764932b33b53cb3b.tar.bz2 | |
tty: n_gsm: fix missing update of modem controls after DLCI open
Currently the peer is not informed about the initial state of the modem
control lines after a new DLCI has been opened.
Fix this by sending the initial modem control line states after DLCI open.
Fixes: e1eaea46bb40 ("tty: n_gsm line discipline")
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Starke <daniel.starke@siemens.com>
Link: https://lore.kernel.org/r/20220420101346.3315-1-daniel.starke@siemens.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/n_gsm.c')
| -rw-r--r-- | drivers/tty/n_gsm.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c index e440c7f6d20e..979dc9151383 100644 --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -370,6 +370,7 @@ static const u8 gsm_fcs8[256] = { #define GOOD_FCS 0xCF static int gsmld_output(struct gsm_mux *gsm, u8 *data, int len); +static int gsmtty_modem_update(struct gsm_dlci *dlci, u8 brk); /** * gsm_fcs_add - update FCS @@ -1483,6 +1484,9 @@ static void gsm_dlci_open(struct gsm_dlci *dlci) pr_debug("DLCI %d goes open.\n", dlci->addr); /* Register gsmtty driver,report gsmtty dev add uevent for user */ tty_register_device(gsm_tty_driver, dlci->addr, NULL); + /* Send current modem state */ + if (dlci->addr) + gsmtty_modem_update(dlci, 0); wake_up(&dlci->gsm->event); } |