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Date: Tue, 27 May 2008 10:50:20 -0700
From: Julian Elischer <julian@elischer.org>
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To: Marcel Moolenaar <xcllnt@mac.com>
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Cc: Ed Schouten <ed@80386.nl>, current@FreeBSD.org, arch@FreeBSD.org,
	Poul-Henning Kamp <phk@phk.freebsd.dk>,
	Robert Watson <rwatson@FreeBSD.org>,
	Ade Lovett <ade@FreeBSD.org>, net@FreeBSD.org,
	"Bruce M. Simpson" <bms@FreeBSD.org>
Subject: Re: HEAD UP: non-MPSAFE network drivers to be disabled
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Marcel Moolenaar wrote:
> On May 27, 2008, at 1:12 AM, Julian Elischer wrote:
> 
>> judging by the bug reports when things get broken there are still a
>> lot of people connected to the internet via dial up lines in places
>> off the beaten track, and still a lot of people who when travelling
>> do use dialup still. Some of these also use mpd. I can not say how 
>> many plan to keep using this in the future but it may be that the 
>> simplest answer is a completely separate sio driver that
>> just has netgraph hooks. I haven't talked with Ed yet but there
>> may be may ways to solve this problem.
> 
> Take a look at uart(4). It has been designed to allow different
> kernel interfaces. It currently supports TTYs and keyboards. It
> should not be too hard to have it hook into netgraph.
> 
> FYI,
> 


While this is a good idea on it's own, the difference between
what that achieves and what a line discipline achieves is that
a line disciplin is hardware independent and can even be used
on a virtual device.