better encapsulate eisa_set_level_irq()

diff -u -ur 2.6.9-rc2-mm4/arch/i386/kernel/acpi/boot.c pic/arch/i386/kernel/acpi/boot.c
@@ -457,16 +457,10 @@
 	 * Make sure all (legacy) PCI IRQs are set as level-triggered.
 	 */
 	if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
-		static u16 irq_mask;
 		extern void eisa_set_level_irq(unsigned int irq);
 
-		if (edge_level == ACPI_LEVEL_SENSITIVE) {
-			if ((gsi < 16) && !((1 << gsi) & irq_mask)) {
-				Dprintk(KERN_DEBUG PREFIX "Setting GSI %u as level-triggered\n", gsi);
-				irq_mask |= (1 << gsi);
+		if (edge_level == ACPI_LEVEL_SENSITIVE)
 				eisa_set_level_irq(gsi);
-			}
-		}
 	}
 #endif
 

diff -u -ur 2.6.9-rc2-mm4/arch/i386/pci/irq.c pic/arch/i386/pci/irq.c
@@ -127,8 +127,15 @@
 {
 	unsigned char mask = 1 << (irq & 7);
 	unsigned int port = 0x4d0 + (irq >> 3);
-	unsigned char val = inb(port);
+	unsigned char val;
+	static u16 eisa_irq_mask;
 
+	if (irq >= 16 || (1 << irq) & eisa_irq_mask)
+		return;
+
+	eisa_irq_mask |= (1 << irq);
+	printk("PCI: setting IRQ %u as level-triggered\n", irq);
+	val = inb(port);
 	if (!(val & mask)) {
 		DBG(" -> edge");
 		outb(val | mask, port);