Re: commit 7e92b4fc34 - x86, serial: convert legacy COM ports to platform devices - broke my serial console

On Wed, 2007-07-25 at 17:37 -0700, Yinghai Lu wrote:
On 7/25/07, Bjorn Helgaas <bjorn.helgaas@xxxxxx> 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@xxxxxx> 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.
The pci root driver is an acpi driver not a pnp driver, so Bjorn's patch
will not work. Maybe the ACPI core (ACPICA) should do the sort?

Thanks,
Shaohua
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