Revert "PCI: Use preserve_config in place of pci_flags"

This reverts commit c1a1393f7844c645389e5f1a3f1f0350e0fb9316 which is
commit 7246a45 upstream.

This patch causes a regression in cuttlefish/crossvm boot on arm64.

The patch was part of a series that when applied will not cause a regression
but this patch was backported to the 5.15 branch by itself.

The other patches do not apply cleanly to the 5.15 branch.

Signed-off-by: Terry Tritton <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
(cherry picked from commit 39f320df353722086372abdcc2659e85afd52c3e)
FOF: 0225
Signed-off-by: Brian Maly <[email protected]>

Author: Terry Tritton

drivers/pci/controller/pci-host-common.c

@@ -73,6 +73,10 @@ int pci_host_common_probe(struct platform_device *pdev)
 	if (IS_ERR(cfg))
 		return PTR_ERR(cfg);
 
+	/* Do not reassign resources if probe only */
+	if (!pci_has_flag(PCI_PROBE_ONLY))
+		pci_add_flags(PCI_REASSIGN_ALL_BUS);
+
 	bridge->sysdata = cfg;
 	bridge->ops = (struct pci_ops *)&ops->pci_ops;
 	bridge->msi_domain = true;

drivers/pci/probe.c

@@ -3068,18 +3068,20 @@ int pci_host_probe(struct pci_host_bridge *bridge)
 
 	bus = bridge->bus;
 
-	/* If we must preserve the resource configuration, claim now */
-	if (bridge->preserve_config)
-		pci_bus_claim_resources(bus);
-
 	/*
-	 * Assign whatever was left unassigned. If we didn't claim above,
-	 * this will reassign everything.
+	 * We insert PCI resources into the iomem_resource and
+	 * ioport_resource trees in either pci_bus_claim_resources()
+	 * or pci_bus_assign_resources().
 	 */
-	pci_assign_unassigned_root_bus_resources(bus);
+	if (pci_has_flag(PCI_PROBE_ONLY)) {
+		pci_bus_claim_resources(bus);
+	} else {
+		pci_bus_size_bridges(bus);
+		pci_bus_assign_resources(bus);
 
-	list_for_each_entry(child, &bus->children, node)
-		pcie_bus_configure_settings(child);
+		list_for_each_entry(child, &bus->children, node)
+			pcie_bus_configure_settings(child);
+	}
 
 	pci_bus_add_devices(bus);
 	return 0;