linux-kernel - Re: [PATCH 07/10] TTY: switch tty_schedule

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Message-ID: <510BD9E9.9000400@suse.cz>
Date:	Fri, 01 Feb 2013 16:06:17 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	Peter Hurley <peter@...leysoftware.com>
CC:	Jiri Slaby <jirislaby@...il.com>, gregkh@...uxfoundation.org,
	alan@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/10] TTY: switch tty_schedule_flip

On 02/01/2013 01:37 PM, Peter Hurley wrote:
> On Thu, 2013-01-03 at 15:53 +0100, Jiri Slaby wrote:
>> Now, we start converting tty buffer functions to actually use
>> tty_port. This will allow us to get rid of the need of tty in many
>> call sites. Only tty_port will needed and hence no more
>> tty_port_tty_get in those paths.
>>
>> This is the last one: tty_schedule_flip
> 
> [snip]
> 
>> diff --git a/drivers/tty/vt/keyboard.c b/drivers/tty/vt/keyboard.c
>> index 5aace4d..a9af1b9a 100644
>> --- a/drivers/tty/vt/keyboard.c
>> +++ b/drivers/tty/vt/keyboard.c
>> @@ -307,26 +307,17 @@ int kbd_rate(struct kbd_repeat *rep)
>>   */
>>  static void put_queue(struct vc_data *vc, int ch)
>>  {
>> -	struct tty_struct *tty = vc->port.tty;
>> -
>>  	tty_insert_flip_char(&vc->port, ch, 0);
>> -	if (tty) {
>> -		tty_schedule_flip(tty);
>> -	}
>> +	tty_schedule_flip(&vc->port);
>>  }
>>  
>>  static void puts_queue(struct vc_data *vc, char *cp)
>>  {
>> -	struct tty_struct *tty = vc->port.tty;
>> -
>> -	if (!tty)
>> -		return;
>> -
>>  	while (*cp) {
>>  		tty_insert_flip_char(&vc->port, *cp, 0);
>>  		cp++;
>>  	}
>> -	tty_schedule_flip(tty);
>> +	tty_schedule_flip(&vc->port);
>>  }
> 
> Umm. So even though the vt driver knows the tty has been shutdown,
> keystrokes will still be buffered? And then fed to whichever tty happens
> to next get installed on the same port?

Unless I completely missed something, they should be flushed. If that's
not the case, that's a bug. I will check next week.

thanks,
-- 
js
suse labs
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