linux-kernel - Re: [PATCH 1/2] acpiphp: create companion ACPI devices before creating PCI devices

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Date:	Fri, 1 Feb 2013 16:17:40 -0700
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Jiang Liu <liuj97@...il.com>
Cc:	Yinghai Lu <yinghai@...nel.org>,
	"Rafael J . Wysocki" <rjw@...k.pl>,
	Jiang Liu <jiang.liu@...wei.com>,
	Yijing Wang <wangyijing@...wei.com>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH 1/2] acpiphp: create companion ACPI devices before
 creating PCI devices

On Fri, Feb 1, 2013 at 4:06 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> On Wed, Jan 30, 2013 at 9:10 AM, Jiang Liu <liuj97@...il.com> wrote:
>> From: Jiang Liu <jiang.liu@...wei.com>
>>
>> With commit 4f535093cf8f6da8c "PCI: Put pci_dev in device tree as
>> early as possible", companion ACPI devices should be created before
>> creating correspoding PCI devices, otherwise it will break the ACPI
>> PCI binding logic.
>>
>> Signed-off-by: Jiang Liu <jiang.liu@...wei.com>

Applied to pci/yinghai-root-bus for v3.9.  Thanks!

>> ---
>> Hi Bjorn,
>>         This patch set applies to your pci/yinghai-root-bus branch.
>> There are still other potential bugs in the acpiphp driver under
>> investigation. So I will send out these two first to catch up with
>> the 3.9 merging window.
>>         Thanks!
>>         Gerry
>
> I assume this fixes some sort of user-visible issue with acpiphp.
> What failure does the user see?
>
>> ---
>>  drivers/pci/hotplug/acpiphp_glue.c |    6 +++---
>>  1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
>> index bd784ff..acb7af2 100644
>> --- a/drivers/pci/hotplug/acpiphp_glue.c
>> +++ b/drivers/pci/hotplug/acpiphp_glue.c
>> @@ -839,6 +839,9 @@ static int __ref enable_device(struct acpiphp_slot *slot)
>>         if (slot->flags & SLOT_ENABLED)
>>                 goto err_exit;
>>
>> +       list_for_each_entry(func, &slot->funcs, sibling)
>> +               acpiphp_bus_add(func);
>> +
>>         num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
>>         if (num == 0) {
>>                 /* Maybe only part of funcs are added. */
>> @@ -862,9 +865,6 @@ static int __ref enable_device(struct acpiphp_slot *slot)
>>                 }
>>         }
>>
>> -       list_for_each_entry(func, &slot->funcs, sibling)
>> -               acpiphp_bus_add(func);
>> -
>>         pci_bus_assign_resources(bus);
>>         acpiphp_sanitize_bus(bus);
>>         acpiphp_set_hpp_values(bus);
>> --
>> 1.7.9.5
>>
--
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