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

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Date:	Mon, 25 Nov 2013 21:00:19 -0500
From:	Peter Hurley <peter@...leysoftware.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.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

On 11/22/2013 05:20 PM, Dmitry Torokhov wrote:
> 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.

Ah, I see your point. I'll respin this for your ack.

Regards,
Peter Hurley

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