Re: [PATCH 3/8] PCI: Move out pci_enable_bridges out of assign_unsigned_bus_res

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On Fri, Sep 28, 2012 at 7:52 PM, Yinghai Lu <yinghai@xxxxxxxxxx> wrote:
> On Fri, Sep 28, 2012 at 6:48 PM, Yinghai Lu <yinghai@xxxxxxxxxx> wrote:
>> On Fri, Sep 28, 2012 at 4:46 PM, Bjorn Helgaas <bhelgaas@xxxxxxxxxx> wrote:
>>> On Thu, Sep 27, 2012 at 2:11 AM, Yinghai Lu <yinghai@xxxxxxxxxx> wrote:
>>>> So could use assign_unassigned_bus_res pci root bus add
>>>
>>> After your series, acpi_pci_root_start() looks like this:
>>>
>>>     pci_assign_unassigned_bus_resources
>>>     list_for_each_entry(driver, &acpi_pci_drivers, node)
>>>         driver->add(root);
>>>     pci_enable_bridges(root->bus);
>>>
>>> so apparently it's important that the driver->add() methods be run
>>> *before* the bridges are enabled.  Why?
>>
>
> During rebase, the changelog get lost.
>
>  pci_enable_bridges
>     ==> pci_enable_device
>         ==> ...
>            ===> pcibios_enable_device
>                ===> pcibios_enable_irq
>
> and one of driver in acpi_pci_drivers, is ioapic drivers and it will
> enable ioapic there.
>
> So we need to enable bridges that later.

Is it important that pci_assign_unassigned_bus_resources() be run
before the driver->add() methods?  Why?

Do you have a pointer to this ioapic driver?  I don't think it's in
the tree yet.  I know about drivers/pci/ioapic.c, but it doesn't use
acpi_pci_register_driver().
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