Re: [PATCH v3 0/6] acpi,pci: hostbridge hotplug support

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On 2012-9-19 2:41, Yinghai Lu wrote:
> On Mon, Sep 17, 2012 at 11:12 PM, Taku Izumi <izumi.taku@xxxxxxxxxxxxxx> wrote:
>> Hi all,
>>
>>   This patchset is 3rd version of the following:
>>     http://marc.info/?l=linux-pci&m=134457928913775&w=2
>>     http://marc.info/?l=linux-pci&m=134665909321684&w=2
>>
>>  v2 -> v3:
>>    - change acpi_pci_drivers' add/remove interface according to Bjorn's suggestion
>>    - abandon RCU for protecting acpi_pci_roots list according to Bjorn's suggestion
>>    - change acpi_pci_find_root implementation to avoid potential deadlock
>>
>>   * [PATCH v3 1/8] ACPI, PCI: Use normal list for struct acpi_pci_driver
>>   * [PATCH v3 2/8] ACPI, PCI: Notify acpi_pci_drivers when hot-plugging PCI root bridges
>>   * [PATCH v3 3/8] ACPI, PCI: add acpi_pci_drivers protection
>>   * [PATCH v3 4/8] ACPI, PCI: change acpi_pci_drivers' add/remove interface
>>   * [PATCH v3 5/8] ACPI, PCI: change acpi_pci_find_root implementation
>>   * [PATCH v3 6/8] ACPI, PCI: add acpi_pci_roots protection
>>   * [PATCH v3 7/8] ACPI, PCI: add hostbridge removal function
>>   * [PATCH v3 8/8] ACPI, PCI: add resoruce-assign code for devices under hot-added hostbridge
> 
> now it is more similar to my for-pci-root-bus-hotplug-part4 and part5
> 
> http://git.kernel.org/?p=linux/kernel/git/yinghai/linux-yinghai.git;a=shortlog;h=refs/heads/for-pci-root-bus-hotplug-part5
> 
> big difference:
> I separated code from acpiphp_glue.c to pci_root_hp.c for root bridge
> hotplug support
> 
> I thought we all agreed on that acpi root bridge hotplug plug need to
> be separated from acpiphp at first.
> 
> http://git.kernel.org/?p=linux/kernel/git/yinghai/linux-yinghai.git;a=commitdiff;h=ab9fd4ccbfb6120a4a4adf9833487d656b0501d3
> 
> and CONFIG_HOTPLUG will always be enabled, so root bridge hotplug will
> be always enabled.
> acpiphp will still be used as one module, and to keep it simple pciehp
> will be used for pcie etc.
> That make the system BIOS much simple to avoid acpiphp.
I think it's a better way to separate host bridge hotplug functionality
from acpiphp driver, so acpiphp only handles PCI device hotplug, which
is much more clear.
--Gerry

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