Patch "ACPICA: Tables: Fix an issue that FACS initialization is performed twice" has been added to the 4.1-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    ACPICA: Tables: Fix an issue that FACS initialization is performed twice

to the 4.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     acpica-tables-fix-an-issue-that-facs-initialization-is-performed-twice.patch
and it can be found in the queue-4.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From c04be18448355441a0c424362df65b6422e27bda Mon Sep 17 00:00:00 2001
From: Lv Zheng <lv.zheng@intel.com>
Date: Wed, 1 Jul 2015 14:43:26 +0800
Subject: ACPICA: Tables: Fix an issue that FACS initialization is performed twice

From: Lv Zheng <lv.zheng@intel.com>

commit c04be18448355441a0c424362df65b6422e27bda upstream.

ACPICA commit 90f5332a15e9d9ba83831ca700b2b9f708274658

This patch adds a new FACS initialization flag for acpi_tb_initialize().
acpi_enable_subsystem() might be invoked several times in OS bootup process,
and we don't want FACS initialization to be invoked twice. Lv Zheng.

Link: https://github.com/acpica/acpica/commit/90f5332a
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/acpi/acpica/utxfinit.c |   10 ++++++----
 include/acpi/actypes.h         |    1 +
 2 files changed, 7 insertions(+), 4 deletions(-)

--- a/drivers/acpi/acpica/utxfinit.c
+++ b/drivers/acpi/acpica/utxfinit.c
@@ -179,10 +179,12 @@ acpi_status __init acpi_enable_subsystem
 	 * Obtain a permanent mapping for the FACS. This is required for the
 	 * Global Lock and the Firmware Waking Vector
 	 */
-	status = acpi_tb_initialize_facs();
-	if (ACPI_FAILURE(status)) {
-		ACPI_WARNING((AE_INFO, "Could not map the FACS table"));
-		return_ACPI_STATUS(status);
+	if (!(flags & ACPI_NO_FACS_INIT)) {
+		status = acpi_tb_initialize_facs();
+		if (ACPI_FAILURE(status)) {
+			ACPI_WARNING((AE_INFO, "Could not map the FACS table"));
+			return_ACPI_STATUS(status);
+		}
 	}
 #endif				/* !ACPI_REDUCED_HARDWARE */
 
--- a/include/acpi/actypes.h
+++ b/include/acpi/actypes.h
@@ -572,6 +572,7 @@ typedef u64 acpi_integer;
 #define ACPI_NO_ACPI_ENABLE             0x10
 #define ACPI_NO_DEVICE_INIT             0x20
 #define ACPI_NO_OBJECT_INIT             0x40
+#define ACPI_NO_FACS_INIT               0x80
 
 /*
  * Initialization state


Patches currently in stable-queue which might be from lv.zheng@intel.com are

queue-4.1/acpica-tables-fix-an-issue-that-facs-initialization-is-performed-twice.patch
queue-4.1/acpica-tables-enable-default-64-bit-fadt-addresses-favor.patch
queue-4.1/acpica-tables-enable-both-32-bit-and-64-bit-facs.patch