powerpc/pci: Properly allocate bus resources for hotplug PHBs

Resources for PHB's that are dynamically added to a system are not
properly allocated in the resource tree.

Not having these resources allocated causes an oops when removing
the PHB when we try to release them.

The diff appears a bit messy, this is mainly due to moving everything
one tab to the left in the pcibios_allocate_bus_resources routine.
The functionality change in this routine is only that the
list_for_each_entry() loop is pulled out and moved to the necessary
calling routine.
Signed-off-by: Nathan Fontenot <nfont@austin.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/include/asm/pci.h

@@ -208,6 +208,8 @@ extern void pcibios_setup_new_device(struct pci_dev *dev);
 
 extern void pcibios_claim_one_bus(struct pci_bus *b);
 
+extern void pcibios_allocate_bus_resources(struct pci_bus *bus);
+
 extern void pcibios_resource_survey(void);
 
 extern struct pci_controller *init_phb_dynamic(struct device_node *dn);

arch/powerpc/kernel/pci-common.c

@@ -1239,14 +1239,12 @@ static int __init reparent_resources(struct resource *parent,
  *	    as well.
  */
 
-static void __init pcibios_allocate_bus_resources(struct list_head *bus_list)
+void pcibios_allocate_bus_resources(struct pci_bus *bus)
 {
-	struct pci_bus *bus;
+	struct pci_bus *b;
 	int i;
 	struct resource *res, *pr;
 
-	/* Depth-First Search on bus tree */
-	list_for_each_entry(bus, bus_list, node) {
 	for (i = 0; i < PCI_BUS_NUM_RESOURCES; ++i) {
 		if ((res = bus->resource[i]) == NULL || !res->flags
 		    || res->start > res->end)
@@ -1293,15 +1291,14 @@ static void __init pcibios_allocate_bus_resources(struct list_head *bus_list)
 			if (reparent_resources(pr, res) == 0)
 				continue;
 		}
-			printk(KERN_WARNING
-			       "PCI: Cannot allocate resource region "
-			       "%d of PCI bridge %d, will remap\n",
-			       i, bus->number);
+		printk(KERN_WARNING "PCI: Cannot allocate resource region "
+		       "%d of PCI bridge %d, will remap\n", i, bus->number);
 clear_resource:
 		res->flags = 0;
 	}
-		pcibios_allocate_bus_resources(&bus->children);
-	}
+
+	list_for_each_entry(b, &bus->children, node)
+		pcibios_allocate_bus_resources(b);
 }
 
 static inline void __devinit alloc_resource(struct pci_dev *dev, int idx)
@@ -1372,10 +1369,13 @@ static void __init pcibios_allocate_resources(int pass)
 
 void __init pcibios_resource_survey(void)
 {
+	struct pci_bus *b;
+
 	/* Allocate and assign resources. If we re-assign everything, then
 	 * we skip the allocate phase
 	 */
-	pcibios_allocate_bus_resources(&pci_root_buses);
+	list_for_each_entry(b, &pci_root_buses, node)
+		pcibios_allocate_bus_resources(b);
 
 	if (!(ppc_pci_flags & PPC_PCI_REASSIGN_ALL_RSRC)) {
 		pcibios_allocate_resources(0);

arch/powerpc/platforms/pseries/pci_dlpar.c

@@ -189,6 +189,7 @@ struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
 {
 	struct pci_controller *phb;
 	int primary;
+	struct pci_bus *b;
 
 	primary = list_empty(&hose_list);
 	phb = pcibios_alloc_controller(dn);
@@ -203,6 +204,7 @@ struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
 		eeh_add_device_tree_early(dn);
 
 	scan_phb(phb);
+	pcibios_allocate_bus_resources(phb->bus);
 	pcibios_fixup_new_pci_devices(phb->bus);
 	pci_bus_add_devices(phb->bus);
 	eeh_add_device_tree_late(phb->bus);