1 files changed, 12 insertions, 16 deletions

diff --git a/arch/x86/kernel/irqinit_64.c b/arch/x86/kernel/irqinit_64.c
index 5b5be9d43c2a..ff0235391285 100644
--- a/arch/x86/kernel/irqinit_64.c
+++ b/arch/x86/kernel/irqinit_64.c
@@ -142,23 +142,19 @@ void __init init_ISA_irqs(void)
         init_bsp_APIC();
         init_8259A(0);
 
-        for (i = 0; i < NR_IRQS; i++) {
-                irq_desc[i].status = IRQ_DISABLED;
-                irq_desc[i].action = NULL;
-                irq_desc[i].depth = 1;
-
-                if (i < 16) {
-                        /*
-                         * 16 old-style INTA-cycle interrupts:
-                         */
-                        set_irq_chip_and_handler_name(i, &i8259A_chip,
+        for (i = 0; i < 16; i++) {
+                /* first time call this irq_desc */
+                struct irq_desc *desc = irq_to_desc(i);
+
+                desc->status = IRQ_DISABLED;
+                desc->action = NULL;
+                desc->depth = 1;
+
+                /*
+                 * 16 old-style INTA-cycle interrupts:
+                 */
+                set_irq_chip_and_handler_name(i, &i8259A_chip,
                                                       handle_level_irq, "XT");
-                } else {
-                        /*
-                         * 'high' PCI IRQs filled in on demand
-                         */
-                        irq_desc[i].chip = &no_irq_chip;
-                }
         }
 }