There is a special case where there is only single bridge on the bus. In
that case we just assign all resources to it. Currently this is done as
a part of the resource distribution loop but it does not have to be
there, and moving it outside actually improves readability.
While there we can add hotplug_bridges == 1 && normal_bridges == 0 to
the same block because they are dealt the same way.
Suggested-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
---
drivers/pci/setup-bus.c | 28 +++++++++++++++++-----------
1 file changed, 17 insertions(+), 11 deletions(-)
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index eb3059fb7f63..a1b63c7745d0 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1947,6 +1947,22 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus,
mmio_start = mmio_res->start;
mmio_pref_start = mmio_pref_res->start;
+ /*
+ * There is only one bridge on the bus so it gets all available
+ * resources which it can then distribute to the possible
+ * hotplug bridges below.
+ */
+ if ((hotplug_bridges == 0 && normal_bridges == 1) ||
+ (hotplug_bridges == 1 && normal_bridges == 0)) {
+ dev = list_first_entry(&bus->devices, struct pci_dev, bus_list);
+ if (dev->subordinate) {
+ pci_bus_distribute_available_resources(dev->subordinate,
+ add_list, available_io, available_mmio,
+ available_mmio_pref);
+ }
+ return;
+ }
+
/*
* Go over devices on this bus and distribute the remaining
* resource space between hotplug bridges.
@@ -1959,17 +1975,7 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus,
if (!b)
continue;
- if (!hotplug_bridges && normal_bridges == 1) {
- /*
- * There is only one bridge on the bus (upstream
- * port) so it gets all available resources
- * which it can then distribute to the possible
- * hotplug bridges below.
- */
- pci_bus_distribute_available_resources(b, add_list,
- available_io, available_mmio,
- available_mmio_pref);
- } else if (dev->is_hotplug_bridge) {
+ if (dev->is_hotplug_bridge) {
resource_size_t io, mmio, mmio_pref;
/*
--
2.16.3
--
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