linux-kernel - Re: [PATCH tty-next 1/5] tty: Always handle NULL flag ptr

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Message-ID: <20131122222040.GA12800@core.coreip.homeip.net>
Date:	Fri, 22 Nov 2013 14:20:42 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org
Subject: Re: [PATCH tty-next 1/5] tty: Always handle NULL flag ptr

Hi Peter,

On Fri, Nov 22, 2013 at 12:09:54PM -0500, Peter Hurley wrote:
> Most line disciplines already handle the undocumented NULL flag
> ptr in their .receive_buf method; however, several don't.
> 
> Document the NULL flag ptr, and correct handling in the
> N_MOUSE, N_GSM0710 and N_R394 line disciplines.
> 
> Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Signed-off-by: Peter Hurley <peter@...leysoftware.com>
> ---
>  drivers/input/serio/serport.c | 28 +++++++++++++++-------------
>  drivers/tty/n_gsm.c           |  5 +++--
>  drivers/tty/n_r3964.c         |  2 +-
>  include/linux/tty_ldisc.h     |  6 ++++--
>  4 files changed, 23 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/input/serio/serport.c b/drivers/input/serio/serport.c
> index 8755f5f..72b4633 100644
> --- a/drivers/input/serio/serport.c
> +++ b/drivers/input/serio/serport.c
> @@ -124,7 +124,7 @@ static void serport_ldisc_receive(struct tty_struct *tty, const unsigned char *c
>  {
>  	struct serport *serport = (struct serport*) tty->disc_data;
>  	unsigned long flags;
> -	unsigned int ch_flags;
> +	unsigned int ch_flags = TTY_NORMAL;

We should not be passing tty constants into serio layer as they are
different subsystems (even though TTY_NORMAL happens to be encoded as 0
and thus happens to work). Please use 0 for 'no flags' as the original
code did.

Other than that the serio portion looks good to me.

Thanks.

-- 
Dmitry
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