[tip:irq/urgent] x86/irq: Fix regression caused by commit b568b8601f05

From: tip-bot for Jiang Liu
Date: Wed Feb 18 2015 - 12:09:12 EST

Commit-ID: 1ea76fbadd667b19c4fa4466f3a3b55a505e83d9
Gitweb: http://git.kernel.org/tip/1ea76fbadd667b19c4fa4466f3a3b55a505e83d9
Author: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
AuthorDate: Mon, 16 Feb 2015 10:11:13 +0800
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Wed, 18 Feb 2015 15:01:41 +0100

x86/irq: Fix regression caused by commit b568b8601f05

Commit b568b8601f05 ("Treat SCI interrupt as normal GSI interrupt")
accidently removes support of legacy PIC interrupt when fixing a
regression for Xen, which causes a nasty regression on HP/Compaq
nc6000 where we fail to register the ACPI interrupt, and thus
lose eg. thermal notifications leading a potentially overheated

So reintroduce support of legacy PIC based ACPI SCI interrupt.

Reported-by: Ville SyrjÃlà <syrjala@xxxxxx>
Tested-by: Ville SyrjÃlà <syrjala@xxxxxx>
Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Acked-by: Pavel Machek <pavel@xxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # 3.19+
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Len Brown <len.brown@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Rafael J. Wysocki <rjw@xxxxxxxxxxxxx>
Cc: Sander Eikelenboom <linux@xxxxxxxxxxxxxx>
Cc: linux-pm@xxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/1424052673-22974-1-git-send-email-jiang.liu@xxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
arch/x86/kernel/acpi/boot.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index a18fff3..8b59163 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -613,6 +613,11 @@ int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
int rc, irq, trigger, polarity;

+ if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
+ *irqp = gsi;
+ return 0;
+ }
rc = acpi_get_override_irq(gsi, &trigger, &polarity);
if (rc == 0) {
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