linux-kernel - [084/103] ACPI: Handle ACPI0007 Device in acpi_early_set

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Date:	Fri, 22 Oct 2010 11:51:58 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Yinghai Lu <yinghai@...nel.org>,
	Len Brown <len.brown@...el.com>
Subject: [084/103] ACPI: Handle ACPI0007 Device in acpi_early_set_pdc

2.6.35-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Yinghai Lu <yinghai@...nel.org>

commit c1e0ddbf0a97e1704d7f13b4934f9acca002402d upstream.

After
| commit d8191fa4a33fdc817277da4f2b7f771ff605a41c
| Author: Alex Chiang <achiang@...com>
| Date:   Mon Feb 22 12:11:39 2010 -0700
|
|    ACPI: processor: driver doesn't need to evaluate _PDC
|
|    Now that the early _PDC evaluation path knows how to correctly
|    evaluate _PDC on only physically present processors, there's no
|    need for the processor driver to evaluate it later when it loads.
|
|    To cover the hotplug case, push _PDC evaluation down into the
|    hotplug paths.

only cpu with Processor Statement get processed with _PDC

If bios is using Device object instead of Processor statement.
SSDTs for Pstate/Cstate/Tstate can not be loaded dynamically.

Need to try to scan ACPI0007 in addition to Processor.

That commit is between 2.6.34-rc1 and 2.6.34-rc2, so stable tree for 2.6.34+
need this patch.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Reviewed-by: Bjorn Helgaas <bjorn.helgaas@...com>
Signed-off-by: Len Brown <len.brown@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/acpi/processor_core.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -352,4 +352,5 @@ void __init acpi_early_processor_set_pdc
 	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
 			    ACPI_UINT32_MAX,
 			    early_init_pdc, NULL, NULL, NULL);
+	acpi_get_devices("ACPI0007", early_init_pdc, NULL, NULL);
 }

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