ACPI: scan: Avoid enumerating devices with clearly invalid _STA values

The return value of _STA with the "present" bit unset and the "enabled"
bit set is clearly invalid as per the ACPI specification, Section 6.3.7
"_STA (Device Status)", so make the ACPI device enumeration code
disregard devices with such _STA return values.

Also, because this implies that status.enabled will only be set if
status.present is set too, acpi_device_is_enabled() can be modified
to simply return the value of the former.

Link: https://uefi.org/specs/ACPI/6.5/06_Device_Configuration.html#sta-device-status
Link: https://lore.kernel.org/linux-acpi/[email protected]/
Suggested-by: Salil Mehta <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
Reviewed-by: Jonathan Cameron <[email protected]>
Reviewed-by: Sudeep Holla <[email protected]>

0 files changed, 0 insertions, 0 deletions