releases/2.6.19.1/revert-acpi-sci-interrupt-source-override.patch

From 7bdd21cef9e5dbc3d3a718c55bb3d0da024644da Mon Sep 17 00:00:00 2001
From: Len Brown <len.brown@intel.com>
To: Linus Torvalds <torvalds@osdl.org>, stable@kernel.org
Cc: Andrew Morton <akpm@osdl.org>, linux-acpi@vger.kernel.org
Date: Sat, 2 Dec 2006 02:27:46 -0500
Subject: Revert "ACPI: SCI interrupt source override"

This reverts commit 281ea49b0c294649a6de47a6f8fbe5611137726b,
which broke ACPI Interrupt source overrides that move
the SCI from one IRQ in PIC mode to another in IOAPIC mode.

If the SCI shared an interrupt line with another device,
this would result in a "irq 18: nobody cared" type failure.

http://bugzilla.kernel.org/show_bug.cgi?id=7601

Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
---
 arch/i386/kernel/acpi/boot.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

--- linux-2.6.19.orig/arch/i386/kernel/acpi/boot.c
+++ linux-2.6.19/arch/i386/kernel/acpi/boot.c
@@ -333,7 +333,7 @@ acpi_parse_ioapic(acpi_table_entry_heade
 /*
  * Parse Interrupt Source Override for the ACPI SCI
  */
-static void acpi_sci_ioapic_setup(u32 bus_irq, u32 gsi, u16 polarity, u16 trigger)
+static void acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
 {
 	if (trigger == 0)	/* compatible SCI trigger is level */
 		trigger = 3;
@@ -353,13 +353,13 @@ static void acpi_sci_ioapic_setup(u32 bu
 	 * If GSI is < 16, this will update its flags,
 	 * else it will create a new mp_irqs[] entry.
 	 */
-	mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
+	mp_override_legacy_irq(gsi, polarity, trigger, gsi);
 
 	/*
 	 * stash over-ride to indicate we've been here
 	 * and for later update of acpi_fadt
 	 */
-	acpi_sci_override_gsi = bus_irq;
+	acpi_sci_override_gsi = gsi;
 	return;
 }
 
@@ -377,7 +377,7 @@ acpi_parse_int_src_ovr(acpi_table_entry_
 	acpi_table_print_madt_entry(header);
 
 	if (intsrc->bus_irq == acpi_fadt.sci_int) {
-		acpi_sci_ioapic_setup(intsrc->bus_irq, intsrc->global_irq,
+		acpi_sci_ioapic_setup(intsrc->global_irq,
 				      intsrc->flags.polarity,
 				      intsrc->flags.trigger);
 		return 0;
@@ -880,7 +880,7 @@ static int __init acpi_parse_madt_ioapic
 	 * pretend we got one so we can set the SCI flags.
 	 */
 	if (!acpi_sci_override_gsi)
-		acpi_sci_ioapic_setup(acpi_fadt.sci_int, acpi_fadt.sci_int, 0, 0);
+		acpi_sci_ioapic_setup(acpi_fadt.sci_int, 0, 0);
 
 	/* Fill in identity legacy mapings where no override */
 	mp_config_acpi_legacy_irqs();