arm64: PCI: Restructure pcibios_root_bridge_prepare()

Restructure the pcibios_root_bridge_prepare() as the preparation for
supporting cases when no real ACPI device is related to the PCI host
bridge.

No functional change.

Link: https://lore.kernel.org/r/20210726180657.142727-4-boqun.feng@gmail.com
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
index 1006ed2..5148ae2 100644 (file)
--- a/arch/arm64/kernel/pci.c
+++ b/arch/arm64/kernel/pci.c
@@ -82,14 +82,19 @@ int acpi_pci_bus_find_domain_nr(struct pci_bus *bus)
 
 int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
 {
-       if (!acpi_disabled) {
-               struct pci_config_window *cfg = bridge->bus->sysdata;
-               struct acpi_device *adev = to_acpi_device(cfg->parent);
-               struct device *bus_dev = &bridge->bus->dev;
+       struct pci_config_window *cfg;
+       struct acpi_device *adev;
+       struct device *bus_dev;
 
-               ACPI_COMPANION_SET(&bridge->dev, adev);
-               set_dev_node(bus_dev, acpi_get_node(acpi_device_handle(adev)));
-       }
+       if (acpi_disabled)
+               return 0;
+
+       cfg = bridge->bus->sysdata;
+       adev = to_acpi_device(cfg->parent);
+       bus_dev = &bridge->bus->dev;
+
+       ACPI_COMPANION_SET(&bridge->dev, adev);
+       set_dev_node(bus_dev, acpi_get_node(acpi_device_handle(adev)));
 
        return 0;
 }