linux-kernel - [PATCH 11/17] xen: don't setup acpi interrupt unless there is one

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Message-Id: <1242170724-13349-12-git-send-email-jeremy@goop.org>
Date:	Tue, 12 May 2009 16:25:18 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: [PATCH 11/17] xen: don't setup acpi interrupt unless there is one

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>

If the SCI hasn't been set, then presumably we're not running
with acpi, don't bother setting up the interrupt.

[ Impact: compatibility with pre-ACPI machines ]

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 arch/x86/xen/pci.c |   11 +++++------
 1 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/arch/x86/xen/pci.c b/arch/x86/xen/pci.c
index 402a5bd..00ad6df 100644
--- a/arch/x86/xen/pci.c
+++ b/arch/x86/xen/pci.c
@@ -69,13 +69,12 @@ void __init xen_setup_pirqs(void)
 	/*
 	 * Set up acpi interrupt in acpi_gbl_FADT.sci_interrupt.
 	 */
-	irq = xen_allocate_pirq(acpi_gbl_FADT.sci_interrupt);
+	if (acpi_gbl_FADT.sci_interrupt > 0) {
+		irq = xen_allocate_pirq(acpi_gbl_FADT.sci_interrupt);
 
-	printk(KERN_INFO "xen: allocated irq %d for acpi %d\n",
-	       irq, acpi_gbl_FADT.sci_interrupt);
-
-	/* Blerk. */
-	acpi_gbl_FADT.sci_interrupt = irq;
+		printk(KERN_INFO "xen: allocated irq %d for acpi %d\n",
+		       irq, acpi_gbl_FADT.sci_interrupt);
+	}
 #endif
 
 	/* Pre-allocate legacy irqs */
-- 
1.6.0.6

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