PCI: xgene: Convert PCI scan API to pci_scan_root_bus_bridge()

The introduction of pci_scan_root_bus_bridge() provides a PCI core API to
scan a PCI root bus backed by an already initialized struct pci_host_bridge
object, which simplifies the bus scan interface and makes the PCI scan root
bus interface easier to generalize as members are added to the struct
pci_host_bridge.

Convert PCI xgene host code to pci_scan_root_bus_bridge() to improve the
PCI root bus scanning interface.

Tested-by: Khuong Dinh <kdinh@apm.com>	# with e1000e
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Tanmay Inamdar <tinamdar@apm.com>

diff --git a/drivers/pci/host/pci-xgene.c b/drivers/pci/host/pci-xgene.c
index 8cae013..262bedf 100644 (file)
--- a/drivers/pci/host/pci-xgene.c
+++ b/drivers/pci/host/pci-xgene.c
@@ -636,13 +636,16 @@ static int xgene_pcie_probe_bridge(struct platform_device *pdev)
        struct xgene_pcie_port *port;
        resource_size_t iobase = 0;
        struct pci_bus *bus, *child;
+       struct pci_host_bridge *bridge;
        int ret;
        LIST_HEAD(res);
 
-       port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
-       if (!port)
+       bridge = devm_pci_alloc_host_bridge(dev, sizeof(*port));
+       if (!bridge)
                return -ENOMEM;
 
+       port = pci_host_bridge_priv(bridge);
+
        port->node = of_node_get(dn);
        port->dev = dev;
 
@@ -670,11 +673,17 @@ static int xgene_pcie_probe_bridge(struct platform_device *pdev)
        if (ret)
                goto error;
 
-       bus = pci_create_root_bus(dev, 0, &xgene_pcie_ops, port, &res);
-       if (!bus) {
-               ret = -ENOMEM;
+       list_splice_init(&res, &bridge->windows);
+       bridge->dev.parent = dev;
+       bridge->sysdata = port;
+       bridge->busnr = 0;
+       bridge->ops = &xgene_pcie_ops;
+
+       ret = pci_scan_root_bus_bridge(bridge);
+       if (ret < 0)
                goto error;
-       }
+
+       bus = bridge->bus;
 
        pci_scan_child_bus(bus);
        pci_assign_unassigned_bus_resources(bus);