From: Bjorn Helgaas <bjorn.helgaas@hp.com>
Date: Wed, 24 Mar 2010 16:44:33 +0000 (-0600)
Subject: ACPI: use _HID when supplied by root-level devices
X-Git-Tag: v2.6.34-rc4~21^2^6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b7b30de53aef6ce773d34837ba7d8422bd3baeec;p=pandora-kernel.git

ACPI: use _HID when supplied by root-level devices

Previously, we assumed the only Device object immediately below the root
was the \_SB Scope (which the ACPI CA treats as a Device), so we forced
the HID of all such objects to ACPI_BUS_HID ("LNXSYBUS").

However, there are DSDTs that supply root-level Device objects with _HIDs.
This patch makes us pay attention to those _HIDs and only add the synthetic
ACPI_BUS_HID for root-level objects that do not supply their own _HID.

For example, this DSDT: https://bugzilla.kernel.org/show_bug.cgi?id=15605
contains:

    Scope (_SB) {
	...
    }
    Device (AMW0) {
	Name (_HID, EisaId ("PNP0C14"))
	...
    }

and we should use "PNP0C14" for the AMW0 device, not "LNXSYBUS".

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Tested-by: Yong Wang <yong.y.wang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
---

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