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

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Date:	Tue, 24 Jul 2007 16:40:42 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
CC:	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	Sébastien Dugué 
	<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

Bjorn Helgaas wrote:
> On Tuesday 24 July 2007 02:13:49 pm Jeff Garzik wrote:
>> Bjorn Helgaas wrote:
>>>   - Linux enumerates CPUs with the MADT; I think Windows uses the ACPI
>>>     namespace.  Sometimes there are multiple MADTs, and sometimes Linux
>>>     uses the wrong one.
>> Color me skeptical.  I think we would have bug reports if we were really 
>> getting this wrong a lot of the time.
> 
> We do have bug reports, like http://bugzilla.kernel.org/show_bug.cgi?id=7465
> Not very many, but enough that I'd like to get to the root cause.
> 
>> You seem to be missing that ignoring BIOS is often a VERY GOOD thing, 
>> that has served us well many many times in the past.
> 
> I can see that I'm not going to win this argument :-)
> 
> But I would like to find and fix the problem with Sebastien's machine,
> because the patch does fix real problems with IRDA and I think the fix
> for Sebastien is likely to fix other PNP issues.

Please go back and fix the original issue!

If you are having problems caused by double-probing, the fix is NOT to 
remove one the probes.  The fix is to ensure use of proper resource 
reservation, and in some cases, add co-driver-awareness.

Your entire justification for the patch has not been proven, since you 
demonstrably have not solved the original bug for which your patch was 
intended to solve.

	Jeff


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