linux-kernel - Re: [patch 01/15] serial: when guessing, check only active resources, not options

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Message-Id: <200806020921.04350.bjorn.helgaas@hp.com>
Date:	Mon, 2 Jun 2008 09:21:02 -0600
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	Rene Herman <rene.herman@...access.nl>
Cc:	Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, Adam Belay <ambx1@....rr.com>,
	Adam M Belay <abelay@....edu>,
	Li Shaohua <shaohua.li@...el.com>,
	Matthieu Castet <castet.matthieu@...e.fr>,
	Thomas Renninger <trenn@...e.de>,
	Jaroslav Kysela <perex@...ex.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Takashi Iwai <tiwai@...e.de>
Subject: Re: [patch 01/15] serial: when guessing, check only active resources, not options

On Sunday 01 June 2008 01:42:01 pm Rene Herman wrote:
> We used to cry "modem" if the device _could_ be configured using a COM 
> address while after this change we'd only do so if it _was_ configured 
> using one.
> 
> My old analog modem for example had 5 dependent sets -- the first with 
> the regular COM port addresses (0x3f8, 0x2f8, 0x3e8, 0x2e8) and a 5th 
> one listing a port range of (IIRC, something like that at least) 0x100 
> to 0xff8.
> 
> So say I'd have a PC with the regular two onboard COM ports at COM1 and 
> COM2 (0x3f8 and 0x2f8) and an additional serial controller providing 
> COM3 and COM4 (0x3e8 and 0x2e8). My modem would then be configured to 
> use 0x100 and this code would no longer trigger while it did use to.

Ah, you're right.  That scenario hadn't occurred to me.  Let me see
if I can figure out a way to make that work again.

Bjorn
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