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

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>

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@xxxxxxxxxx>
---
 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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