linux-kernel - Re: [PATCH v2 15/20] tty: n_gsm: fix missing update of modem controls after DLCI open

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Message-ID: <Yl6J/vUZrIUEZoMg@kroah.com>
Date:   Tue, 19 Apr 2022 12:07:58 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     "D. Starke" <daniel.starke@...mens.com>
Cc:     linux-serial@...r.kernel.org, jirislaby@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 15/20] tty: n_gsm: fix missing update of modem
 controls after DLCI open

On Tue, Apr 19, 2022 at 01:07:24AM -0700, D. Starke wrote:
> From: Daniel Starke <daniel.starke@...mens.com>
> 
> 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@...r.kernel.org
> Signed-off-by: Daniel Starke <daniel.starke@...mens.com>
> ---
>  drivers/tty/n_gsm.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
> index f3fb66be8513..07d03447cdfd 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
> @@ -1479,6 +1480,9 @@ 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);
>  }
>  
> -- 
> 2.25.1
> 

Hi,

This is the friendly patch-bot of Greg Kroah-Hartman.  You have sent him
a patch that has triggered this response.  He used to manually respond
to these common problems, but in order to save his sanity (he kept
writing the same thing over and over, yet to different people), I was
created.  Hopefully you will not take offence and will fix the problem
in your patch and resubmit it so that it can be accepted into the Linux
kernel tree.

You are receiving this message because of the following common error(s)
as indicated below:

- This looks like a new version of a previously submitted patch, but you
  did not list below the --- line any changes from the previous version.
  Please read the section entitled "The canonical patch format" in the
  kernel file, Documentation/SubmittingPatches for what needs to be done
  here to properly describe this.

If you wish to discuss this problem further, or you have questions about
how to resolve this issue, please feel free to respond to this email and
Greg will reply once he has dug out from the pending patches received
from other developers.

thanks,

greg k-h's patch email bot