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>
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 4d9ebb4..8f86be1 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1440,7 +1440,7 @@
/* any device complain? */
if (list_empty(&fail_head))
- goto enable_and_dump;
+ goto dump;
if (tried_times >= pci_try_num) {
if (enable_local == undefined)
@@ -1449,7 +1449,7 @@
dev_info(&bus->dev, "Automatically enabled pci realloc, if you have problem, try booting with pci=realloc=off\n");
free_list(&fail_head);
- goto enable_and_dump;
+ goto dump;
}
dev_printk(KERN_DEBUG, &bus->dev,
@@ -1482,10 +1482,7 @@
goto again;
-enable_and_dump:
- /* Depth last, update the hardware. */
- pci_enable_bridges(bus);
-
+dump:
/* dump the resource on buses */
pci_bus_dump_resources(bus);
}
@@ -1556,7 +1553,6 @@
if (retval)
dev_err(&bridge->dev, "Error reenabling bridge (%d)\n", retval);
pci_set_master(bridge);
- pci_enable_bridges(parent);
}
EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources);