PCI: portdrv: Restore PCI config state on slot reset (874b3251) · Commits · 戴 / test

The port's config space may be cleared after a link reset, which wipes out the bridge's bus and memory windows. Restore the config space that was saved during probe so we can access downstream devices. Signed-off-by:

Keith Busch <keith.busch@intel.com> Signed-off-by:

Bjorn Helgaas <bhelgaas@google.com> Reviewed-by:

Sinan Kaya <okaya@kernel.org>

drivers/pci/pcie/portdrv_pci.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -146,6 +146,13 @@ static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
		return PCI_ERS_RESULT_CAN_RECOVER;
		}

		static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
		{
		pci_restore_state(dev);
		pci_save_state(dev);
		return PCI_ERS_RESULT_RECOVERED;
		}

		static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
		{
		return PCI_ERS_RESULT_RECOVERED;
		@@ -185,6 +192,7 @@ static const struct pci_device_id port_pci_ids[] = { {

		static const struct pci_error_handlers pcie_portdrv_err_handler = {
		.error_detected = pcie_portdrv_error_detected,
		.slot_reset = pcie_portdrv_slot_reset,
		.mmio_enabled = pcie_portdrv_mmio_enabled,
		.resume = pcie_portdrv_err_resume,
		};

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