PCI: Delay enabling bridges until they're needed

We currently enable PCI bridges after scanning a bus and assigning
resources.  This is often done in arch code.

This patch changes this so we don't enable a bridge until necessary, i.e.,
until we enable a PCI device behind the bridge.  We do this in the generic
pci_enable_device() path, so this also removes the arch-specific code to
enable bridges.

[bhelgaas: changelog]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

1 files changed, 0 insertions, 3 deletions

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 5917839321b8..faa1d29c0261 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -527,9 +527,6 @@ static int acpi_pci_root_add(struct acpi_device *device,
         if (system_state != SYSTEM_BOOTING) {
                 pcibios_resource_survey_bus(root->bus);
                 pci_assign_unassigned_bus_resources(root->bus);
-
-                /* need to after hot-added ioapic is registered */
-                pci_enable_bridges(root->bus);
         }
 
         pci_bus_add_devices(root->bus);