diff options
| -rw-r--r-- | drivers/pci/pcie/aspm.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index 1dfa10cc566b..0bea8498b5a5 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -802,10 +802,14 @@ static struct pcie_link_state *alloc_pcie_link_state(struct pci_dev *pdev) /* * Root Ports and PCI/PCI-X to PCIe Bridges are roots of PCIe - * hierarchies. + * hierarchies. Note that some PCIe host implementations omit + * the root ports entirely, in which case a downstream port on + * a switch may become the root of the link state chain for all + * its subordinate endpoints. */ if (pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT || - pci_pcie_type(pdev) == PCI_EXP_TYPE_PCIE_BRIDGE) { + pci_pcie_type(pdev) == PCI_EXP_TYPE_PCIE_BRIDGE || + !pdev->bus->parent->self) { link->root = link; } else { struct pcie_link_state *parent; |