linux-kernel - Re: [PATCH 1/2] tty: new helper function tty_get

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Message-ID: <5f67e2cf-f141-fde4-96de-28ceeeec9c06@kernel.org>
Date:   Tue, 14 Feb 2023 08:41:01 +0100
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Florian Eckert <fe@....tdt.de>, u.kleine-koenig@...gutronix.de,
        gregkh@...uxfoundation.org, pavel@....cz, lee@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org,
        Eckert.Florian@...glemail.com
Subject: Re: [PATCH 1/2] tty: new helper function tty_get_mget

On 13. 02. 23, 15:06, Florian Eckert wrote:
> For a given struct tty_struct, this provides the appropriate tty line
> state flags needed to add more modes to the ledtrig-tty trigger.
> 
> The new function is then used to get via tty_tiocmget() the different tty
> line states.
> 
> Signed-off-by: Florian Eckert <fe@....tdt.de>
> ---
>   drivers/tty/tty_io.c | 32 +++++++++++++++++++++++++-------
>   include/linux/tty.h  |  3 ++-
>   2 files changed, 27 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
> index 3149114bf130..e4dc59eda43f 100644
> --- a/drivers/tty/tty_io.c
> +++ b/drivers/tty/tty_io.c
> @@ -2493,26 +2493,44 @@ static int send_break(struct tty_struct *tty, unsigned int duration)
>   	return retval;
>   }
>   
> +/*
> + * tty_get_mget		-	get modem status
> + * @tty: tty device
> + *
> + * Obtain the modem status bits from the tty driver if the feature
> + * is supported. Return -ENOTTY if it is not available.
> + *

Superfluous empty line.

> + */
> +

This empty line is even wrong wrt kernel-doc!

> +int tty_get_mget(struct tty_struct *tty)
> +{
> +	int retval = -ENOTTY;
> +
> +	if (tty->ops->tiocmget)
> +		retval = tty->ops->tiocmget(tty);
> +
> +	return retval;
> +}
...
> --- a/include/linux/tty.h
> +++ b/include/linux/tty.h
> @@ -419,8 +419,9 @@ void tty_unthrottle(struct tty_struct *tty);
>   int tty_throttle_safe(struct tty_struct *tty);
>   int tty_unthrottle_safe(struct tty_struct *tty);
>   int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
> -int tty_get_icount(struct tty_struct *tty,
> +int tty_get_icount(struct tty_struct *tty

The robot already complained about this ^^^.

Have you even tried to compile-test this?

>   		struct serial_icounter_struct *icount);
> +extern int tty_get_mget(struct tty_struct *tty);

No need for extern. Didn't you notice the surrounding declarations?

>   int is_current_pgrp_orphaned(void);
>   void tty_hangup(struct tty_struct *tty);
>   void tty_vhangup(struct tty_struct *tty);

thanks,
-- 
js
suse labs