linux-kernel - Re: [PATCH] Use tty

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Message-ID: <469D35B1.5050905@microgate.com>
Date:	Tue, 17 Jul 2007 15:33:37 -0600
From:	Paul Fulghum <paulkf@...rogate.com>
To:	James Simmons <jsimmons@...radead.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux console project <linuxconsole-dev@...ts.sourceforge.net>
Subject: Re: [PATCH] Use tty_schedule in VT code.

James Simmons wrote:
> The low_latency is used by the drivers in the case where its 
> not in a interrupt context. Well we are trusting the drivers.
> Now if it is true what you said then tty_flip_buffer_push has
> a bug. Looking at several drivers including serial devices
> they set the low_latency flag.

The generic serial driver (8250) is the one that was
dead locking when that code originally existed.
It was setting low_latency and calling from interrupt context.

>> And the initial schedule has no reason to add the extra delay.
> 
> So do you support a non delay work queue as well?

No, the delay work must be used for flush_to_ldisc()
so it makes no sense to define two different work queues
(one delayed and one not) for the same work.

I support your patch.

The current stuff works and your patch works.
With your patch, you actually reduce initial
latency for processing receive data.

Whichever way everyone else wants to go.

-- 
Paul Fulghum
Microgate Systems, Ltd.
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