linux-kernel - Re: [PATCH] PCI: Remove not needed check in disable aspm link

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Date:	Tue, 11 Jun 2013 23:20:18 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Jiang Liu <jiang.liu@...wei.com>
Cc:	Roman Yepishev <roman.yepishev@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Taku Izumi <izumi.taku@...fujitsu.com>,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Matthew Garrett <matthew.garrett@...ula.com>,
	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>
Subject: Re: [PATCH] PCI: Remove not needed check in disable aspm link

On Tue, Apr 2, 2013 at 1:10 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> On Mon, Apr 1, 2013 at 6:03 PM, Yinghai Lu <yinghai@...nel.org> wrote:
>>> commit 96e5d01cd536458435ef0678d9fa3dc542afb41f
>>> Author: Bjorn Helgaas <bhelgaas@...gle.com>
>>> Date:   Mon Apr 1 15:47:39 2013 -0600
>>>
>>>     Revert "PCI/ACPI: Request _OSC control before scanning PCI root bus"
>>>
>>>     This reverts commit 8c33f51df406e1a1f7fa4e9b244845b7ebd61fa6.
>>>
>>>     Conflicts:
>>>         drivers/acpi/pci_root.c
>>>
>>>     Reference: https://bugzilla.kernel.org/show_bug.cgi?id=55211
>>>     Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
>>
>> Acked-by: Yinghai Lu <yinghai@...nel.org>
>>
>> stable need this reverting too.
>
> I updated the changelog and added this to my for-linus branch, headed for v3.9.

We may need to revert this reverting for 3.10.

Today noticed that acpiphp jump in before pciehp on one setup.

current code from acpi_pci_root_add we have
  1. pci_acpi_scan_root
         ==> pci devices enumeration and bus scanning.
             ==> pci_alloc_child_bus
                 ==> pcibios_add_bus
                     ==> acpi_pci_add_bus
                         ==> acpiphp_enumerate_slots
                             ==> ...==> register_slot
                                  ==> device_is_managed_by_native_pciehp
                                        ==> check osc_set with
OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
   2. _OSC set request

so we always have acpiphp hotplug slot registered at first.

so either we need to
A. revert reverting about _OSC
B. move pcibios_add_bus down to pci_bus_add_devices()
    as acpiphp and apci pci slot driver are some kind of drivers for pci_bus
C. A+B

Thanks

Yinghai
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