On Tue, Jun 12, 2018 at 02:42:13PM +0800, Pingfan Liu wrote:
> The Linux Device Driver Model allows a physical device to be handled
> by only a single driver. But at present, both shpchp and portdrv_pci
> claim PCI_CLASS_BRIDGE_PCI, and touch devices_kset. This causes a
> few problems, one is the wrong shutdown seq of devices, owing to the
> broken devices_kset.

How can they both touch devices_kset?  Once one driver has claimed the
device it should not be available to others.

> +     /* do not claim pcie port device */
> +     if (pci_is_pcie(dev) &&
> +         ((pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT) ||
> +          (pci_pcie_type(dev) == PCI_EXP_TYPE_UPSTREAM) ||
> +          (pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM)))
> +             return -ENODEV;

No need for the inner braces.

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