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

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Message-ID: <86802c440707251835p7a1522aejbea949f2148b51fc@mail.gmail.com>
Date:	Wed, 25 Jul 2007 18:35:43 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Bjorn Helgaas" <bjorn.helgaas@...com>
Cc:	"Sébastien Dugué" <sebastien.dugue@...l.net>,
	linux-kernel <linux-kernel@...r.kernel.org>, ambx1@....rr.com,
	akpm@...ux-foundation.org, lenb@...nel.org, rmk@....linux.org.uk,
	mjg59@...f.ucam.org, castet.matthieu@...e.fr, shaohua.li@...el.com
Subject: Re: commit 7e92b4fc34 - x86, serial: convert legacy COM ports to platform devices - broke my serial console

On 7/25/07, Yinghai Lu <yhlu.kernel@...il.com> wrote:
> On 7/25/07, Bjorn Helgaas <bjorn.helgaas@...com> wrote:
> > On Wednesday 25 July 2007 07:32:53 am Sébastien Dugué wrote:
> > > On Wed, 25 Jul 2007 07:16:44 -0600 Bjorn Helgaas <bjorn.helgaas@...com> wrote:
> > >
> > > > The _DDN is a "DOS device name", and the _UID is a "logical device ID
> > > > that does not change across reboots."  Both are optional, and PNPACPI
> > > > ignores them.  But maybe we could change PNPACPI to sort by them if
> > > > they are present.  I'll think about this a bit.
> > >
> > >   That would be nice, but I wish you good luck with all those
> > > crappy BIOSes out there.
> >
> > Yeah, it's an ugly world we live in.  Would you be able to try the
> > attached patch just for testing?  It should sort devices with the
> > same _HID by their _UID.  It doesn't have any effect on my systems,
> > because my devices are already ordered by _UID by default.  But I
> > think it should switch your COM1/COM2 ports back to the order you
> > expect.
> >
> > Yinghai, you mentioned the same issue on boxes with multiple root
> > bridges.  Any chance you could try this out there as well?
> >
> it doesn't solve pci_root_bus reverse problem.
>
> is that too late for PNP0A03?
>
> I wonder if we need to modify acpi_device_register to sort them.

local hack for pci_root reverse problem would be

 or in acpi_pci_register_driver, sort the acpi_pci_roots before using it.

YH
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