linux-kernel - Re: commit 7e92b4fc34 - x86, serial: convert legacy COM ports to platform devices

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Message-ID: <20070725164808.41404dc7@the-village.bc.nu>
Date:	Wed, 25 Jul 2007 16:48:08 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Jeff Garzik <jeff@...zik.org>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	SÃ©bastien DuguÃ© 
	<sebastien.dugue@...l.net>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: commit 7e92b4fc34 - x86, serial: convert legacy COM ports to
 platform devices - broke my serial console

On 25 Jul 2007 18:30:50 +0200
Andi Kleen <andi@...stfloor.org> wrote:

> Alan Cox <alan@...rguk.ukuu.org.uk> writes:
> 
> > > That cannot be a justification for breaking serial port probe that has 
> > > been working for 10+ years.
> > 
> > Agree. With my "nearest thing we have to a serial maintainer" hat on
> > please revert this Andrew. Bjorn - lets discuss putting the right APIs in
> > place so you can busy out serial ports from other drivers when they are a
> > shared resource.
> 
> One alternative would be to make the default behaviour dependent on 
> DMI year and acpi enabled. On modern systems with ACPI ACPI serial
> probing should work (modulo bugs which can be probably worked out) 
> Let's say >= 2003 ? 

That isn't the problem with the IR stuff. In many cases the user wants
the port to be showing up as a serial port for SIR usage. We need a clean
automatic SIR/FIR switching for them. It has nothing to do with whether
the ACPI data is trustworthy or not.

Alan
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