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tty: n_gsm: fix missing update of modem controls after DLCI open

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[ Upstream commit 48473802506d2d6151f59e0e764932b33b53cb3b ]

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: e1eaea46bb ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Daniel Starke
2022-04-20 03:13:44 -07:00
committed by Greg Kroah-Hartman
parent 4db0a8dd90
commit 920e849b7d
1 changed files with 4 additions and 0 deletions
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4
drivers/tty/n_gsm.c
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@@ -371,6 +371,7 @@ 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
@@ -1489,6 +1490,9 @@ static void gsm_dlci_open(struct gsm_dlci *dlci)
dlci->state = DLCI_OPEN;
if (debug & 8)
pr_debug("DLCI %d goes open.\n", dlci->addr);
/* Send current modem state */
if (dlci->addr)
gsmtty_modem_update(dlci, 0);
wake_up(&dlci->gsm->event);
}