ACPI: Introduce acpi_is_root_bridge()
Returns whether an ACPI CA node is a PCI root bridge or not. This API is generically useful, and shouldn't just be a hotplug function. The implementation becomes much simpler as well. Signed-off-by: NAlex Chiang <achiang@hp.com> Acked-by: NBjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: NLen Brown <len.brown@intel.com>
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