Re: [PATCH 1/1] Update acpi_root_bridge_list in container hotplugpath.

From: Tang Chen
Date: Fri Oct 19 2012 - 04:50:44 EST


On 10/18/2012 12:28 AM, Yinghai Lu wrote:
On Wed, Oct 17, 2012 at 12:39 AM, Tang Chen<tangchen@xxxxxxxxxxxxxx> wrote:
On 10/17/2012 01:18 PM, Yinghai Lu wrote:

And also, I have another 2 questions, maybe you can help me.
1) Do we need to put PNP0A08 into acpi_pci_roots ?

looks like we need to unify those two ids.

2) In container_notify_cb(), when it got a ACPI_NOTIFY_EJECT_REQUEST
event, it doesn't do the hot-remove things.
I use your sci emulator patch to test it. I did the following thing:
echo echo "\_SB_.LSB1"> /sys/kernel/debug/acpi/sci_notify
where \_SB_.LSB1 is a container, it just did nothing.
Do we need to support this operation ?

yes, looks like need to add container_device_remove and call it under
container_notify_cb/ACPI_NOTIFY_EJECT_REQUEST

and should look like handle_root_bridge_removal to call acpi_bus_trim two times.

Hi Yinghai,

You said the following in another patch:
"[PATCH 27/40] ACPI: acpi_bus_trim to support two steps."

> For root bus hotremove support, we need to have pci device removed
> before acpi devices.
>
> So try to keep all acpi devices, and only stop drivers with them.

Is it just container and pci_root_bridge hot-remove need to call
acpi_bus_trim() twice ? For normal device without sub-device, I think
it is OK to call acpi_bus_trim(device, 1).

The reason why I'm asking this question is:

I saw in acpi_bus_hot_remove_device(), it almost does the same things
you did in handle_root_bridge_removal(), except calling acpi_bus_trim()
twice. And there are more than one path could do container hot-remove.

If I add a container_device_remove() doing the similar things, it could
be duplicated. So, shall we just remove handle_root_bridge_removal(),
and only use acpi_bus_hot_remove_device() ?

Of course, we need to call acpi_bus_trim() twice in
acpi_bus_hot_remove_device().

Thanks. :)


Thanks

Yinghai
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