Merge tag 'pci-v6.1-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci

Pull pci fix from Bjorn Helgaas:
 "Revert the attempt to distribute spare resources to unconfigured
  hotplug bridges at boot time.

  This fixed some dock hot-add scenarios, but Jonathan Cameron reported
  that it broke a topology with a multi-function device where one
  function was a Switch Upstream Port and the other was an Endpoint"

* tag 'pci-v6.1-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
  Revert "PCI: Distribute available resources for root buses, too"

Author: torvalds

drivers/pci/setup-bus.c

@@ -1768,10 +1768,7 @@ static void adjust_bridge_window(struct pci_dev *bridge, struct resource *res,
 	}
 
 	res->end = res->start + new_size - 1;
-
-	/* If the resource is part of the add_list remove it now */
-	if (add_list)
-		remove_from_list(add_list, res);
+	remove_from_list(add_list, res);
 }
 
 static void pci_bus_distribute_available_resources(struct pci_bus *bus,
@@ -1926,8 +1923,6 @@ static void pci_bridge_distribute_available_resources(struct pci_dev *bridge,
 	if (!bridge->is_hotplug_bridge)
 		return;
 
-	pci_dbg(bridge, "distributing available resources\n");
-
 	/* Take the initial extra resources from the hotplug port */
 	available_io = bridge->resource[PCI_BRIDGE_IO_WINDOW];
 	available_mmio = bridge->resource[PCI_BRIDGE_MEM_WINDOW];
@@ -1939,59 +1934,6 @@ static void pci_bridge_distribute_available_resources(struct pci_dev *bridge,
 					       available_mmio_pref);
 }
 
-static bool pci_bridge_resources_not_assigned(struct pci_dev *dev)
-{
-	const struct resource *r;
-
-	/*
-	 * Check the child device's resources and if they are not yet
-	 * assigned it means we are configuring them (not the boot
-	 * firmware) so we should be able to extend the upstream
-	 * bridge's (that's the hotplug downstream PCIe port) resources
-	 * in the same way we do with the normal hotplug case.
-	 */
-	r = &dev->resource[PCI_BRIDGE_IO_WINDOW];
-	if (!r->flags || !(r->flags & IORESOURCE_STARTALIGN))
-		return false;
-	r = &dev->resource[PCI_BRIDGE_MEM_WINDOW];
-	if (!r->flags || !(r->flags & IORESOURCE_STARTALIGN))
-		return false;
-	r = &dev->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
-	if (!r->flags || !(r->flags & IORESOURCE_STARTALIGN))
-		return false;
-
-	return true;
-}
-
-static void pci_root_bus_distribute_available_resources(struct pci_bus *bus,
-							struct list_head *add_list)
-{
-	struct pci_dev *dev, *bridge = bus->self;
-
-	for_each_pci_bridge(dev, bus) {
-		struct pci_bus *b;
-
-		b = dev->subordinate;
-		if (!b)
-			continue;
-
-		/*
-		 * Need to check "bridge" here too because it is NULL
-		 * in case of root bus.
-		 */
-		if (bridge && pci_bridge_resources_not_assigned(dev)) {
-			pci_bridge_distribute_available_resources(bridge, add_list);
-			/*
-			 * There is only PCIe upstream port on the bus
-			 * so we don't need to go futher.
-			 */
-			return;
-		}
-
-		pci_root_bus_distribute_available_resources(b, add_list);
-	}
-}
-
 /*
  * First try will not touch PCI bridge res.
  * Second and later try will clear small leaf bridge res.
@@ -2031,8 +1973,6 @@ void pci_assign_unassigned_root_bus_resources(struct pci_bus *bus)
 	 */
 	__pci_bus_size_bridges(bus, add_list);
 
-	pci_root_bus_distribute_available_resources(bus, add_list);
-
 	/* Depth last, allocate resources and update the hardware. */
 	__pci_bus_assign_resources(bus, add_list, &fail_head);
 	if (add_list)