On Thu, Apr 14, 2022 at 02:42:20AM -0700, D. Starke wrote:
> From: Daniel Starke <daniel.starke@xxxxxxxxxxx>
>
> 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@xxxxxxxxxxxxxxx
> Signed-off-by: Daniel Starke <daniel.starke@xxxxxxxxxxx>
> ---
> drivers/tty/n_gsm.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
> index f3fb66be8513..e9a7d9483c1f 100644
> --- a/drivers/tty/n_gsm.c
> +++ b/drivers/tty/n_gsm.c
> @@ -369,7 +369,11 @@ static const u8 gsm_fcs8[256] = {
> #define INIT_FCS 0xFF
> #define GOOD_FCS 0xCF
>
> +/*
> + * Prototypes
> + */
We know they are prototypes, no need to say it :)
> 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
> @@ -1479,6 +1483,8 @@ 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);
> + if (dlci->addr) /* Send current modem state */
> + gsmtty_modem_update(dlci, 0);
Please do not put comments at the end of a line like this.
thanks,
greg k-h
