spi-topcliff-pch: Modify pci-bus number dynamically to get DMA device info

Signed-off-by: Tomoya MORINAGA <tomoya.rohm@gmail.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/drivers/spi/spi-topcliff-pch.c b/drivers/spi/spi-topcliff-pch.c
index 4a5fafb..4b32fd7 100644
--- a/drivers/spi/spi-topcliff-pch.c
+++ b/drivers/spi/spi-topcliff-pch.c
@@ -924,7 +924,8 @@
 	dma_cap_set(DMA_SLAVE, mask);
 
 	/* Get DMA's dev information */
-	dma_dev = pci_get_bus_and_slot(2, PCI_DEVFN(12, 0));
+	dma_dev = pci_get_bus_and_slot(data->board_dat->pdev->bus->number,
+				       PCI_DEVFN(12, 0));
 
 	/* Set Tx DMA */
 	param = &dma->param_tx;