linux-kernel - Re: [PATCH v4] tty: n_gsm: delete DISC command frame as requester

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Date:   Wed, 21 Jul 2021 12:22:39 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Zhenguo Zhao <zhenguo6858@...il.com>
Cc:     jirislaby@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] tty: n_gsm: delete DISC command frame as requester

On Mon, Jul 05, 2021 at 07:59:42PM +0800, Zhenguo Zhao wrote:
> From: Zhenguo Zhao <Zhenguo.Zhao1@...soc.com>
> 
> as initiator,it need to send DISC command ,as requester,there is
> no need to send the DISC control frame,it will cause redundant data.

I am really sorry, but I can not understand what the problem is here,
nor what you are saying is being changed.

Can you try to resend this with a more expanded changelog text?  Perhaps
get someone else to help out with the wording?


> 
> Signed-off-by: Zhenguo Zhao <Zhenguo.Zhao1@...soc.com>
> ---
>  drivers/tty/n_gsm.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
> index 5fea02c..ea9c750 100644
> --- a/drivers/tty/n_gsm.c
> +++ b/drivers/tty/n_gsm.c
> @@ -2050,7 +2050,8 @@ static int gsm_disconnect(struct gsm_mux *gsm)
>  	del_timer_sync(&gsm->t2_timer);
>  	/* Now we are sure T2 has stopped */
>  
> -	gsm_dlci_begin_close(dlci);
> +	if (gsm->initiator)
> +		gsm_dlci_begin_close(dlci);
>  	wait_event_interruptible(gsm->event,
>  				dlci->state == DLCI_CLOSED);
>  
> @@ -3024,7 +3025,8 @@ static void gsmtty_close(struct tty_struct *tty, struct file *filp)
>  	mutex_unlock(&dlci->mutex);
>  	if (tty_port_close_start(&dlci->port, tty, filp) == 0)
>  		return;
> -	gsm_dlci_begin_close(dlci);
> +	if (dlci->gsm->initiator)
> +		gsm_dlci_begin_close(dlci);
>  	if (tty_port_initialized(&dlci->port) && C_HUPCL(tty))
>  		tty_port_lower_dtr_rts(&dlci->port);
>  	tty_port_close_end(&dlci->port, tty);
> @@ -3035,10 +3037,12 @@ static void gsmtty_close(struct tty_struct *tty, struct file *filp)
>  static void gsmtty_hangup(struct tty_struct *tty)
>  {
>  	struct gsm_dlci *dlci = tty->driver_data;
> +	struct gsm_mux *gsm = dlci->gsm;
>  	if (dlci->state == DLCI_CLOSED)

You have a coding style issue here now, so I can't take this anyway :(

thanks,

greg k-h