Re: [PATCH][Regression fix] PCI / Hotplug: Always allow acpiphp to handle non-PCIe bridges

[Rafael J. Wysocki]

Hi Jesse,

On Tuesday, December 13, 2011, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@xxxxxxx>
> 
> Commit 0d52f54e2ef64c189dedc332e680b2eb4a34590a (PCI / ACPI: Make
> acpiphp ignore root bridges using PCIe native hotplug) added code
> that made the acpiphp driver completely ignore PCIe root complexes
> for which the kernel had been granted control of the native PCIe
> hotplug feature by the BIOS through _OSC.  Unfortunately, however,
> this was a mistake, because on some systems there were PCI bridges
> supporting PCI (non-PCIe) hotplug under such root complexes and
> those bridges should have been handled by acpiphp.
> 
> For this reason, revert the changes made by the commit mentioned
> above and make register_slot() in drivers/pci/hotplug/acpiphp_glue.c
> avoid registering hotplug slots for PCIe ports that belong to
> root complexes with native PCIe hotplug enabled (which means that
> the BIOS has granted the kernel control of this feature for the
> given root complex).  This is reported to address the original
> issue fixed by commit 0d52f54e2ef64c189dedc332e680b2eb4a34590a and
> to work on the system where that commit broke things.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
> ---

Sorry for the breakage, I clearly should have been more careful here.

Please also revert this commit from your linux-next branch:

http://git.kernel.org/?p=linux/kernel/git/jbarnes/pci.git;a=commit;h=71c50ab7a32968b73b533dd27620eef563ace6b7

as it makes the same mistake and depends on the code being removed by this
patch.

Thanks,
Rafael
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