MIPS: ath79: allow to specify bus number in PCI IRQ maps

This is needed for multiple PCI bus support.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/4913/
Signed-off-by: John Crispin <blogic@openwrt.org>
diff --git a/arch/mips/ath79/pci.c b/arch/mips/ath79/pci.c
index c94bcec..d90e071 100644
--- a/arch/mips/ath79/pci.c
+++ b/arch/mips/ath79/pci.c
@@ -75,7 +75,9 @@
 		const struct ath79_pci_irq *entry;
 
 		entry = &ath79_pci_irq_map[i];
-		if (entry->slot == slot && entry->pin == pin) {
+		if (entry->bus == dev->bus->number &&
+		    entry->slot == slot &&
+		    entry->pin == pin) {
 			irq = entry->irq;
 			break;
 		}