linux-kernel - Re: [PATCH 10/10] tty: Return bool from tty_termios_hw

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <Y7aX9XmjlwBcdZE5@hovoldconsulting.com>
Date:   Thu, 5 Jan 2023 10:27:17 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc:     linux-serial@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/10] tty: Return bool from tty_termios_hw_change()

On Wed, Jan 04, 2023 at 05:15:31PM +0200, Ilpo Järvinen wrote:
> Change tty_termios_hw_change() return to bool and convert it to
> a or-chained return statement.
> 
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> ---
>  drivers/tty/tty_ioctl.c | 10 ++++------
>  include/linux/tty.h     |  2 +-
>  2 files changed, 5 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/tty/tty_ioctl.c b/drivers/tty/tty_ioctl.c
> index ce511557b98b..4a80fabf6d5e 100644
> --- a/drivers/tty/tty_ioctl.c
> +++ b/drivers/tty/tty_ioctl.c
> @@ -270,13 +270,11 @@ EXPORT_SYMBOL(tty_termios_copy_hw);
>   *	between the two termios structures, or a speed change is needed.
>   */
>  
> -int tty_termios_hw_change(const struct ktermios *a, const struct ktermios *b)
> +bool tty_termios_hw_change(const struct ktermios *a, const struct ktermios *b)
>  {
> -	if (a->c_ispeed != b->c_ispeed || a->c_ospeed != b->c_ospeed)
> -		return 1;
> -	if ((a->c_cflag ^ b->c_cflag) & ~(HUPCL | CREAD | CLOCAL))
> -		return 1;
> -	return 0;
> +	return a->c_ispeed != b->c_ispeed ||
> +	       a->c_ospeed != b->c_ospeed ||
> +	       (a->c_cflag ^ b->c_cflag) & ~(HUPCL | CREAD | CLOCAL);

Please keep the current structure which is more readable rather than
merge everything into one long expression.

Johan