linux-kernel - Re: [PATCH 1/4] hvc_console: do not set low

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Date:	Thu, 8 Jan 2009 12:36:19 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Milton Miller <miltonm@....com>
Cc:	Christian Borntraeger <borntraeger@...ibm.com>,
	Benjiman Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev list <linuxppc-dev@...abs.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Joe Peterson <joe@...rush.com>
Subject: Re: [PATCH 1/4] hvc_console: do not set low_latency

> v2.6.16-rc1 via 33f0f88f1c51ae5c2d593d26960c760ea154c2e2
>     [PATCH] TTY layer buffering revamp
> 
> added this new api.

No - tty_flip_buffer_push is from 2.1.66 and with the same constraints
from the day it was added.


> Having the flag set for purely polled drivers will save delaying
> the work when receiving input for 1 jiffie.
> 
> 
> Index: work.git/drivers/char/hvc_console.c
> ===================================================================
> --- work.git.orig/drivers/char/hvc_console.c	2009-01-08 03:01:24.000000000 -0600
> +++ work.git/drivers/char/hvc_console.c	2009-01-08 03:01:51.000000000 -0600
> @@ -318,7 +318,8 @@ static int hvc_open(struct tty_struct *t
>  	} /* else count == 0 */
>  
>  	tty->driver_data = hp;
> -	tty->low_latency = 1; /* Makes flushes to ldisc synchronous. */
> +	if (!hp->irq_requested)
> +		tty->low_latency = 1; /* Makes flushes to ldisc synchronous. */
>  
>  	hp->tty = tty;

Looks good to me
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