--- a/include/linux/bcma/bcma_driver_mips.h
+++ b/include/linux/bcma/bcma_driver_mips.h
@@ -48,6 +48,6 @@ static inline void bcma_core_mips_early_
 
 extern u32 bcma_cpu_clock(struct bcma_drv_mips *mcore);
 
-extern unsigned int bcma_core_mips_irq(struct bcma_device *dev);
+extern unsigned int bcma_core_irq(struct bcma_device *core);
 
 #endif /* LINUX_BCMA_DRIVER_MIPS_H_ */
--- a/drivers/bcma/driver_chipcommon.c
+++ b/drivers/bcma/driver_chipcommon.c
@@ -332,7 +332,7 @@ void bcma_chipco_serial_init(struct bcma
 		return;
 	}
 
-	irq = bcma_core_mips_irq(cc->core);
+	irq = bcma_core_irq(cc->core);
 
 	/* Determine the registers of the UARTs */
 	cc->nr_serial_ports = (cc->capabilities & BCMA_CC_CAP_NRUART);
--- a/drivers/bcma/driver_mips.c
+++ b/drivers/bcma/driver_mips.c
@@ -86,7 +86,7 @@ static u32 bcma_core_mips_irqflag(struct
  * If disabled, 5 is returned.
  * If not supported, 6 is returned.
  */
-unsigned int bcma_core_mips_irq(struct bcma_device *dev)
+static unsigned int bcma_core_mips_irq(struct bcma_device *dev)
 {
 	struct bcma_device *mdev = dev->bus->drv_mips.core;
 	u32 irqflag;
@@ -103,7 +103,13 @@ unsigned int bcma_core_mips_irq(struct b
 
 	return 5;
 }
-EXPORT_SYMBOL(bcma_core_mips_irq);
+
+unsigned int bcma_core_irq(struct bcma_device *dev)
+{
+	unsigned int mips_irq = bcma_core_mips_irq(dev);
+	return mips_irq <= 4 ? mips_irq + 2 : 0;
+}
+EXPORT_SYMBOL(bcma_core_irq);
 
 static void bcma_core_mips_set_irq(struct bcma_device *dev, unsigned int irq)
 {
@@ -316,7 +322,7 @@ void bcma_core_mips_init(struct bcma_drv
 		break;
 	default:
 		list_for_each_entry(core, &bus->cores, list) {
-			core->irq = bcma_core_mips_irq(core) + 2;
+			core->irq = bcma_core_irq(core);
 		}
 		bcma_err(bus,
 			 "Unknown device (0x%x) found, can not configure IRQs\n",
--- a/drivers/bcma/driver_pci_host.c
+++ b/drivers/bcma/driver_pci_host.c
@@ -577,7 +577,7 @@ int bcma_core_pci_plat_dev_init(struct p
 	pr_info("PCI: Fixing up device %s\n", pci_name(dev));
 
 	/* Fix up interrupt lines */
-	dev->irq = bcma_core_mips_irq(pc_host->pdev->core) + 2;
+	dev->irq = bcma_core_irq(pc_host->pdev->core);
 	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
 
 	return 0;
@@ -596,6 +596,6 @@ int bcma_core_pci_pcibios_map_irq(const 
 
 	pc_host = container_of(dev->bus->ops, struct bcma_drv_pci_host,
 			       pci_ops);
-	return bcma_core_mips_irq(pc_host->pdev->core) + 2;
+	return bcma_core_irq(pc_host->pdev->core);
 }
 EXPORT_SYMBOL(bcma_core_pci_pcibios_map_irq);
--- a/arch/mips/bcm47xx/serial.c
+++ b/arch/mips/bcm47xx/serial.c
@@ -62,7 +62,7 @@ static int __init uart8250_init_bcma(voi
 
 		p->mapbase = (unsigned int) bcma_port->regs;
 		p->membase = (void *) bcma_port->regs;
-		p->irq = bcma_port->irq + 2;
+		p->irq = bcma_port->irq;
 		p->uartclk = bcma_port->baud_base;
 		p->regshift = bcma_port->reg_shift;
 		p->iotype = UPIO_MEM;