linux-kernel - [ 008/120] ACPI: run _OSC after ACPI_FULL

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Message-Id: <20121011005826.848762529@linuxfoundation.org>
Date:	Thu, 11 Oct 2012 09:59:20 +0900
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk, Lin Ming <ming.m.lin@...el.com>,
	Aaron Lu <aaron.lu@...el.com>, Len Brown <len.brown@...el.com>
Subject: [ 008/120] ACPI: run _OSC after ACPI_FULL_INITIALIZATION

3.4-stable review patch.  If anyone has any objections, please let me know.

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

From: Lin Ming <ming.m.lin@...el.com>

commit fc54ab72959edbf229b65ac74b2f122d799ca002 upstream.

The _OSC method may exist in module level code,
so it must be called after ACPI_FULL_INITIALIZATION

On some new platforms with Zero-Power-Optical-Disk-Drive (ZPODD)
support, this fix is necessary to save power.

Signed-off-by: Lin Ming <ming.m.lin@...el.com>
Tested-by: Aaron Lu <aaron.lu@...el.com>
Signed-off-by: Len Brown <len.brown@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/acpi/bus.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -954,8 +954,6 @@ static int __init acpi_bus_init(void)
 	status = acpi_ec_ecdt_probe();
 	/* Ignore result. Not having an ECDT is not fatal. */
 
-	acpi_bus_osc_support();
-
 	status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 	if (ACPI_FAILURE(status)) {
 		printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
@@ -963,6 +961,12 @@ static int __init acpi_bus_init(void)
 	}
 
 	/*
+	 * _OSC method may exist in module level code,
+	 * so it must be run after ACPI_FULL_INITIALIZATION
+	 */
+	acpi_bus_osc_support();
+
+	/*
 	 * _PDC control method may load dynamic SSDT tables,
 	 * and we need to install the table handler before that.
 	 */


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