On Fri, Dec 30, 2016 at 02:27:31AM +0100, Rafael J. Wysocki wrote: > From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> > > The way acpi_find_child_device() works currently is that, if there > are two (or more) devices with the same _ADR value in the same > namespace scope (which is not specifically allowed by the spec and > the OS behavior in that case is not defined), the first one of them > found to be present (with the help of _STA) will be returned. > > This covers the majority of cases, but is not sufficient if some of > the devices in question have a _HID (or _CID) returning some valid > ACPI/PNP device IDs (which is disallowed by the spec) and the > ASL writers' expectation appears to be that the OS will match > devices without a valid ACPI/PNP device ID against a given bus > address first. > > To cover this special case as well, modify find_child_checks() > to prefer devices without ACPI/PNP device IDs over devices that > have them. > > Suggested-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Thanks for taking care of this Rafael :) -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
