Re: [PATCH v2 0/6] PCI: Allow for future resource expansion on initial root bus scan

[Bjorn Helgaas <helgaas@kernel.org>]

On Mon, Sep 05, 2022 at 11:02:26AM +0300, Mika Westerberg wrote:
> Hi,
> 
> The series works around an issue found on some Dell systems where
> booting with Thunderbolt/USB4 devices connected the BIOS leaves some of
> the PCIe devices unconfigured. If the connected devices that are not
> configured have PCIe hotplug ports as well the initial root bus scan
> only reserves the minimum amount of resources to them making any
> expansion happening later impossible.
> 
> We do already distribute the "spare" resources between hotplug ports on
> hot-add but we have not done that upon the initial scan. The first four
> patches make the initial root bus scan path to do the same.
> 
> The additional patches are just a small cleanups that can be applied
> separately too.
> 
> The related bug: https://bugzilla.kernel.org/show_bug.cgi?id=216000.
> 
> The previous version of the patch series can be found here:
> 
>   https://lore.kernel.org/linux-pci/20220816100740.68667-1-mika.westerberg@linux.intel.com/
> 
> Changes from the previous version:
> 
>   * Split patch 3 into two: move and then the actual fix as suggested by
>     Andy.
>   * Fold the two whitespace fixes into one patch.
>   * Added tags from Chris and Andy.
> 
> Mika Westerberg (6):
>   PCI: Fix used_buses calculation in pci_scan_child_bus_extend()
>   PCI: Pass available buses also when the bridge is already configured
>   PCI: Move pci_assign_unassigned_root_bus_resources()
>   PCI: Distribute available resources for root buses too
>   PCI: Fix whitespace and indentation
>   PCI: Fix typo in pci_scan_child_bus_extend()
> 
>  drivers/pci/probe.c     |  13 +-
>  drivers/pci/setup-bus.c | 290 ++++++++++++++++++++++++----------------
>  2 files changed, 181 insertions(+), 122 deletions(-)

Applied to pci/resource for v6.1, thanks, Mika!