1 files changed, 15 insertions, 2 deletions

diff --git a/arch/x86_64/kernel/mpparse.c b/arch/x86_64/kernel/mpparse.c
index 08abf9f5b159..79c362d03e2e 100644
--- a/arch/x86_64/kernel/mpparse.c
+++ b/arch/x86_64/kernel/mpparse.c
@@ -970,8 +970,21 @@ int mp_register_gsi(u32 gsi, int edge_level, int active_high_low)
                  * due to unused I/O APIC pins.
                  */
                 int irq = gsi;
-                gsi = pci_irq++;
-                gsi_to_irq[irq] = gsi;
+                if (gsi < MAX_GSI_NUM) {
+                        if (gsi > 15)
+                                gsi = pci_irq++;
+#ifdef CONFIG_ACPI_BUS
+                        /*
+                         * Don't assign IRQ used by ACPI SCI
+                         */
+                        if (gsi == acpi_fadt.sci_int)
+                                gsi = pci_irq++;
+#endif
+                        gsi_to_irq[irq] = gsi;
+                } else {
+                        printk(KERN_ERR "GSI %u is too high\n", gsi);
+                        return gsi;
+                }
         }
 
         io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,