tree 10962790433ee0865ab6506c69981e8248368e46
parent adc08e2035f1859d4b129f42b2c2305ef090d226
author Bjorn Helgaas <bjorn.helgaas@hp.com> 1253561390 +0000
committer Len Brown <len.brown@intel.com> 1253903069 -0400

ACPI: identify device tree root by null parent pointer, not ACPI_BUS_TYPE

We can identify the root of the ACPI device tree by the fact that it
has no parent.  This is simpler than passing around ACPI_BUS_TYPE_SYSTEM
and will help remove special treatment of the device tree root.

Currently, we add the root by hand with ACPI_BUS_TYPE_SYSTEM.  If we
traverse the tree treating the root as just another device and use
acpi_get_type(), the root shows up as ACPI_TYPE_DEVICE.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>