ACPI / PCI: pci_link: Allow the absence of _PRS and change log level
In recent Intel hardware the IRQs become non-configurable after BIOS initializes them in PEI phase and _PRS objects are no longer included in ASL. This is the same as "static (non-configurable) devices do not specify a _PRS object" in ACPI spec. As a result, error messages saying "ACPI Exception: AE_NOT_FOUND, Evaluating _PRS" does not need to be in kernel messenges all the time but only when debug is enabled, and acpi_pci_link_get_possible should not return -ENODEV when _PRS is absent. Signed-off-by: Alex Hung <alex.hung@canonical.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -173,8 +173,8 @@ static int acpi_pci_link_get_possible(struct acpi_pci_link *link)
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status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS,
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status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS,
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acpi_pci_link_check_possible, link);
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acpi_pci_link_check_possible, link);
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if (ACPI_FAILURE(status)) {
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRS"));
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acpi_handle_debug(link->device->handle, "_PRS not present or invalid");
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return -ENODEV;
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return 0;
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}
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}
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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