linux-kernel - [PATCH] x86: call dmi-quirks for HP Laptops after early-quirks are executed

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Date:	Wed, 22 Oct 2008 13:28:58 +0200
From:	Andreas Herrmann <andreas.herrmann3@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org
Subject: [PATCH] x86: call dmi-quirks for HP Laptops after early-quirks are
	executed

Problems with bogus IRQ0 override of those laptops should be fixed
with commits

x86: SB600: skip IRQ0 override if it is not routed to INT2 of IOAPIC
x86: SB450: skip IRQ0 override if it is not routed to INT2 of IOAPIC

that introduce early-quirks based on chipset configuration.

For further information, see
http://bugzilla.kernel.org/show_bug.cgi?id=11516

Instead of removing the related dmi-quirks completely we'd like to
keep them for (at least) one kernel version -- to double-check whether
the early-quirks really took effect. But the dmi-quirks need to be
called after early-quirks are executed. With this patch calling
sequence for dmi-quirks is changed as follows:

 acpi_boot_table_init()   (dmi-quirks)
 ...
 early_quirks()           (detect bogus IRQ0 override)
 ...
 acpi_boot_init()         (late dmi-quirks and setup IO APIC)

Note: Plan is to remove the "late dmi-quirks" with next kernel version.

Cc: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Andreas Herrmann <andreas.herrmann3@....com>

---
 arch/x86/kernel/acpi/boot.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 0d1c26a..3e822bc 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -1598,6 +1598,11 @@ static struct dmi_system_id __initdata acpi_dmi_table[] = {
 		     DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
 		     },
 	 },
+	{}
+};
+
+/* second table for DMI checks that should run after early-quirks */
+static struct dmi_system_id __initdata acpi_dmi_table_late[] = {
 	/*
 	 * HP laptops which use a DSDT reporting as HP/SB400/10000,
 	 * which includes some code which overrides all temperature
@@ -1726,6 +1731,9 @@ int __init early_acpi_boot_init(void)
 
 int __init acpi_boot_init(void)
 {
+        /* those are executed after early-quirks are executed */
+	dmi_check_system(acpi_dmi_table_late);
+
 	/*
 	 * If acpi_disabled, bail out
 	 * One exception: acpi=ht continues far enough to enumerate LAPICs
-- 
1.6.0.2



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