diff --git a/arch/x86/pci/irq.c b/arch/x86/pci/irq.c
index a8715861877e..579745ca6b66 100644
--- a/arch/x86/pci/irq.c
+++ b/arch/x86/pci/irq.c
@@ -200,7 +200,7 @@ static int pirq_ali_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
 {
 	static const unsigned char irqmap[16] = { 0, 9, 3, 10, 4, 5, 7, 6, 1, 11, 0, 12, 0, 14, 0, 15 };
 
-	WARN_ON_ONCE(pirq >= 16);
+	WARN_ON_ONCE(pirq > 16);
 	return irqmap[read_config_nybble(router, 0x48, pirq-1)];
 }
 
@@ -209,7 +209,7 @@ static int pirq_ali_set(struct pci_dev *router, struct pci_dev *dev, int pirq, i
 	static const unsigned char irqmap[16] = { 0, 8, 0, 2, 4, 5, 7, 6, 0, 1, 3, 9, 11, 0, 13, 15 };
 	unsigned int val = irqmap[irq];
 
-	WARN_ON_ONCE(pirq >= 16);
+	WARN_ON_ONCE(pirq > 16);
 	if (val) {
 		write_config_nybble(router, 0x48, pirq-1, val);
 		return 1;
@@ -260,7 +260,7 @@ static int pirq_via586_get(struct pci_dev *router, struct pci_dev *dev, int pirq
 {
 	static const unsigned int pirqmap[5] = { 3, 2, 5, 1, 1 };
 
-	WARN_ON_ONCE(pirq >= 5);
+	WARN_ON_ONCE(pirq > 5);
 	return read_config_nybble(router, 0x55, pirqmap[pirq-1]);
 }
 
@@ -268,7 +268,7 @@ static int pirq_via586_set(struct pci_dev *router, struct pci_dev *dev, int pirq
 {
 	static const unsigned int pirqmap[5] = { 3, 2, 5, 1, 1 };
 
-	WARN_ON_ONCE(pirq >= 5);
+	WARN_ON_ONCE(pirq > 5);
 	write_config_nybble(router, 0x55, pirqmap[pirq-1], irq);
 	return 1;
 }
@@ -282,7 +282,7 @@ static int pirq_ite_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
 {
 	static const unsigned char pirqmap[4] = { 1, 0, 2, 3 };
 
-	WARN_ON_ONCE(pirq >= 4);
+	WARN_ON_ONCE(pirq > 4);
 	return read_config_nybble(router,0x43, pirqmap[pirq-1]);
 }
 
@@ -290,7 +290,7 @@ static int pirq_ite_set(struct pci_dev *router, struct pci_dev *dev, int pirq, i
 {
 	static const unsigned char pirqmap[4] = { 1, 0, 2, 3 };
 
-	WARN_ON_ONCE(pirq >= 4);
+	WARN_ON_ONCE(pirq > 4);
 	write_config_nybble(router, 0x43, pirqmap[pirq-1], irq);
 	return 1;
 }