From a67fa10338ca70d5645855c20de08f12fd200971 Mon Sep 17 00:00:00 2001
From: Stefan Eßer <se@FreeBSD.org>
Date: Thu, 23 Jan 1997 22:58:03 +0000
Subject: Make IRQ 0 invalid in pci_map_int(), since it is hardwired to the
 programmable interval timer chip in PC systems.

---
 sys/dev/pci/pci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'sys/dev')

diff --git a/sys/dev/pci/pci.c b/sys/dev/pci/pci.c
index 08ad7d97f1e8..23c110909df6 100644
--- a/sys/dev/pci/pci.c
+++ b/sys/dev/pci/pci.c
@@ -1315,7 +1315,7 @@ int pci_map_int (pcici_t tag, pci_inthand_t *func, void *arg, unsigned *maskptr)
 	*/
 
 	irq = getirq (tag);
-	if (irq >= PCI_MAX_IRQ) {
+	if ((irq == 0) || (irq >= PCI_MAX_IRQ)) {
 		printf ("\tillegal irq %d.\n", irq);
 		return (0);
 	};
-- 
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