A hot-added bridge with many hotplug-capable ports may request reserving
more IO space than the machine has. This could be overridden with the
"hpiosize=" kernel argument though.
But when BARs are movable, no need to reserve space anymore: new BARs are
allocated not from reserved gaps, but via rearranging the existing BARs.
Requesting a precise amount of space for bridge windows increases the
chances of adding the new bridge successfully.
Signed-off-by: Sergei Miroshnichenko <s.miroshnichenko@xxxxxxxxx>
---
drivers/pci/setup-bus.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 3081f2d2a48a..e37976551a05 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1302,7 +1302,7 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head)
case PCI_HEADER_TYPE_BRIDGE:
pci_bridge_check_ranges(bus);
- if (bus->self->is_hotplug_bridge) {
+ if (bus->self->is_hotplug_bridge && !pci_can_move_bars) {
additional_io_size = pci_hotplug_io_size;
additional_mmio_size = pci_hotplug_mmio_size;
additional_mmio_pref_size = pci_hotplug_mmio_pref_size;
--
2.24.1
