From: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> Reorder pci_bus_distribute_available_resources() to group related code together. No functional change intended. Link: https://lore.kernel.org/r/PS2P216MB0642C7A485649D2D787A1C6F80000@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Based-on-patch-by: Nicholas Johnson <nicholas.johnson-opensource@xxxxxxxxxxxxxx> [bhelgaas: extracted from larger patch] Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> --- The original order was: 1) remaining_io = available_io 2) for_each_pci_bridge(dev, bus) # count hotplug_bridges, normal_bridges 3) for_each_pci_bridge(dev, bus) if (!dev->is_hotplug_bridge) # reduce remaining_io by dev window 4) if (hotplug_bridges + normal_bridges == 1) # distribute available_io to the single bridge # return 5) for_each_pci_bridge(dev, bus) # distribute remaining_io to hotplug bridges Blocks 2 and 4 don't require remaining_io, so do them first. Blocks 1, 3, 5 deal with remaining_io, so group them together. --- drivers/pci/setup-bus.c | 50 ++++++++++++++++++++--------------------- 1 file changed, 25 insertions(+), 25 deletions(-) diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index 0cdd5ff389de..af28af898e42 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -1860,16 +1860,6 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus, extend_bridge_window(bridge, mmio_pref_res, add_list, available_mmio_pref); - /* - * Calculate the total amount of extra resource space we can - * pass to bridges below this one. This is basically the - * extra space reduced by the minimal required space for the - * non-hotplug bridges. - */ - remaining_io = available_io; - remaining_mmio = available_mmio; - remaining_mmio_pref = available_mmio_pref; - /* * Calculate how many hotplug bridges and normal bridges there * are on this bus. We will distribute the additional available @@ -1882,6 +1872,31 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus, normal_bridges++; } + /* + * 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 + normal_bridges == 1) { + 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; + } + + /* + * Calculate the total amount of extra resource space we can + * pass to bridges below this one. This is basically the + * extra space reduced by the minimal required space for the + * non-hotplug bridges. + */ + remaining_io = available_io; + remaining_mmio = available_mmio; + remaining_mmio_pref = available_mmio_pref; + for_each_pci_bridge(dev, bus) { const struct resource *res; @@ -1905,21 +1920,6 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus, remaining_mmio_pref -= resource_size(res); } - /* - * 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 + normal_bridges == 1) { - 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. -- 2.22.0.410.gd8fdbe21b5-goog
