linux-kernel - [PATCH ] tbfadt.c: output warning only when 64bit 32bit address of FACS/DSDT all have value but not equal to each other

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Date:	Tue, 13 Nov 2012 11:31:45 +0800
From:	Ethan Zhao <ethan.kernel@...il.com>
To:	Len Brown <len.brown@...el.com>
Cc:	robert.moore@...el.com, lv.zheng@...el.com,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH ] tbfadt.c: output warning only when 64bit 32bit address of
 FACS/DSDT all have value but not equal to each other

Hi, Len, Robert,

       Please help to check the following patch, add more conditions
when validate the 64bit 32bit FACS/DSDT address in FADT to follow ACPI
spec, In the meantime, keep the compatibility and latitude.


Thanks,
Ethan



>From c1116211a7b329c26b0370565c36b084ceb08f71 Mon Sep 17 00:00:00 2001
From: ethan.zhao <ethan.kernel@...il.com>
Date: Tue, 13 Nov 2012 22:21:12 -0800
Subject: [PATCH 642/642] To follow the ACPI spec 3,4&5 and keep the
compatibility and latitude,only
 output mismatch warning when 64bit address and 32bit address of
FACS/DSDT are all
 valid but not equal to each other.


Signed-off-by: ethan.zhao <ethan.kernel@...il.com>
---
 drivers/acpi/acpica/tbfadt.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/acpica/tbfadt.c b/drivers/acpi/acpica/tbfadt.c
index 3906518..f23f512 100644
--- a/drivers/acpi/acpica/tbfadt.c
+++ b/drivers/acpi/acpica/tbfadt.c
@@ -512,7 +512,7 @@ static void acpi_tb_validate_fadt(void)
         * the 32-bit and 64-bit address fields
(FIRMWARE_CTRL/X_FIRMWARE_CTRL and
         * DSDT/X_DSDT) would indicate the presence of two FACS or two
DSDT tables.
         */
-       if (acpi_gbl_FADT.facs &&
+       if ((acpi_gbl_FADT.facs && acpi_gbl_FADT.Xfacs) &&
            (acpi_gbl_FADT.Xfacs != (u64)acpi_gbl_FADT.facs)) {
                ACPI_BIOS_WARNING((AE_INFO,
                                   "32/64X FACS address mismatch in FADT - "
@@ -523,7 +523,7 @@ static void acpi_tb_validate_fadt(void)
                acpi_gbl_FADT.Xfacs = (u64)acpi_gbl_FADT.facs;
        }

-       if (acpi_gbl_FADT.dsdt &&
+       if ((acpi_gbl_FADT.dsdt && acpi_gbl_FADT.Xdsdt) &&
            (acpi_gbl_FADT.Xdsdt != (u64)acpi_gbl_FADT.dsdt)) {
                ACPI_BIOS_WARNING((AE_INFO,
                                   "32/64X DSDT address mismatch in FADT - "
--
1.7.1

Download attachment "To-follow-the-ACPI-spec-3-4-5-and-keep-the-compatibi.patch" of type "application/octet-stream" (1481 bytes)