[PATCH 11/24] PCI: Add defines for bridge window indexing

[Ilpo Järvinen]

include/linux/pci.h provides PCI_BRIDGE_{IO,MEM,PREF_MEM}_WINDOW
defines, however, they're based on the resource array indexing in the
pci_dev struct. The struct pci_bus also has pointers to those same
resource but they start from zeroth index.

Add PCI_BUS_BRIDGE_{IO,MEM,PREF_MEM}_WINDOW defines to get rid of
literal indexing.

Signed-off-by: Ilpo Järvinen <ilpo.jarvi...@linux.intel.com>
---
 drivers/pci/pci.h   |  4 ++++
 drivers/pci/probe.c | 10 +++++++---
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 34f65d69662e..1dc8a8066761 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -81,6 +81,10 @@ struct pcie_tlp_log;
 #define PCIE_MSG_CODE_DEASSERT_INTC    0x26
 #define PCIE_MSG_CODE_DEASSERT_INTD    0x27
 
+#define PCI_BUS_BRIDGE_IO_WINDOW       0
+#define PCI_BUS_BRIDGE_MEM_WINDOW      1
+#define PCI_BUS_BRIDGE_PREF_MEM_WINDOW 2
+
 extern const unsigned char pcie_link_speed[];
 extern bool pci_early_dump;
 
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index f31d27c7708a..eaeb66bec433 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -598,9 +598,13 @@ void pci_read_bridge_bases(struct pci_bus *child)
        for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
                child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
 
-       pci_read_bridge_io(child->self, child->resource[0], false);
-       pci_read_bridge_mmio(child->self, child->resource[1], false);
-       pci_read_bridge_mmio_pref(child->self, child->resource[2], false);
+       pci_read_bridge_io(child->self,
+                          child->resource[PCI_BUS_BRIDGE_IO_WINDOW], false);
+       pci_read_bridge_mmio(child->self,
+                            child->resource[PCI_BUS_BRIDGE_MEM_WINDOW], false);
+       pci_read_bridge_mmio_pref(child->self,
+                                 
child->resource[PCI_BUS_BRIDGE_PREF_MEM_WINDOW],
+                                 false);
 
        if (!dev->transparent)
                return;
-- 
2.39.5