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authorDaniel Starke <daniel.starke@siemens.com>2022-04-20 03:13:44 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2022-04-20 16:52:25 +0200
commit48473802506d2d6151f59e0e764932b33b53cb3b (patch)
tree76aaaa1dd9f81cfc4ed1ea638f076553dfeb304e /drivers/tty/n_gsm.c
parentcc994bb97587787b8f0c094a9bc6945d82075b1d (diff)
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.c4
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);
}