linux-kernel - Re: [PATCH v2 1/6] tty: n_gsm: add enumeration for gsm encodings

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Date:   Tue, 30 Aug 2022 08:49:08 +0200
From:   Jiri Slaby <jirislaby@...nel.org>
To:     "D. Starke" <daniel.starke@...mens.com>,
        linux-serial@...r.kernel.org, gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/6] tty: n_gsm: add enumeration for gsm encodings

On 23. 08. 22, 8:22, D. Starke wrote:
> From: Daniel Starke <daniel.starke@...mens.com>
> 
> Add an enumeration for the gsm mux encoding types to improve code
> readability and to avoid invalid values. Only two values are defined by the
> standard:
> - basic option mode
> - advanced option mode (uses ISO HDLC standard transparency mechanism)
> 
> Also remove redundant configuration in gsmld_open(). The same value is
> already set in gsm_alloc_mux() which is also called in gsmld_open().
> 
> Signed-off-by: Daniel Starke <daniel.starke@...mens.com>
> ---
>   drivers/tty/n_gsm.c | 31 +++++++++++++++++--------------
>   1 file changed, 17 insertions(+), 14 deletions(-)
> 
> No changes since v1.
> 
> diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
> index caa5c14ed57f..5bf09d129357 100644
> --- a/drivers/tty/n_gsm.c
> +++ b/drivers/tty/n_gsm.c
...
> @@ -2651,7 +2656,7 @@ static void gsm_copy_config_values(struct gsm_mux *gsm,
>   {
>   	memset(c, 0, sizeof(*c));
>   	c->adaption = gsm->adaption;
> -	c->encapsulation = gsm->encoding;
> +	c->encapsulation = (int)gsm->encoding;

IIRC, the C standard says enum behave like int. So why is the cast needed?

>   	c->initiator = gsm->initiator;
>   	c->t1 = gsm->t1;
>   	c->t2 = gsm->t2;
...
> @@ -2942,8 +2947,6 @@ static int gsmld_open(struct tty_struct *tty)
>   	tty->receive_room = 65536;
>   
>   	/* Attach the initial passive connection */
> -	gsm->encoding = 1;
> -

This doesn't relate to "add enumeration for gsm encodings". Why do you 
remove this line?

>   	gsmld_attach_gsm(tty, gsm);

thanks,
-- 
js
suse labs