[PATCH] ppc64: use struct list_head for hose_list

This patch changes hose_list from a simple linked list to a
"list.h"-style list.  This is in preparation for the runtime
addition/removal of PCI Host Bridges.
Signed-off-by: John Rose <johnrose@austin.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/ppc64/kernel/pSeries_iommu.c

@@ -90,7 +90,7 @@ static void tce_free_pSeries(struct iommu_table *tbl, long index, long npages)
 
 static void iommu_buses_init(void)
 {
-	struct pci_controller* phb;
+	struct pci_controller *phb, *tmp;
 	struct device_node *dn, *first_dn;
 	int num_slots, num_slots_ilog2;
 	int first_phb = 1;
@@ -106,10 +106,10 @@ static void iommu_buses_init(void)
 	else
 		tcetable_ilog2 = 22;
 
-	/* XXX Should we be using pci_root_buses instead?  -ojn 
+	/* XXX Should we be using pci_root_buses instead?  -ojn
 	 */
 
-	for (phb=hose_head; phb; phb=phb->next) {
+	list_for_each_entry_safe(phb, tmp, &hose_list, list_node) {
 		first_dn = ((struct device_node *)phb->arch_data)->child;
 
 		/* Carve 2GB into the largest dma_window_size possible */

arch/ppc64/kernel/pSeries_pci.c

@@ -729,9 +729,9 @@ EXPORT_SYMBOL(remap_bus_range);
 
 static void phbs_fixup_io(void)
 {
-	struct pci_controller *hose;
+	struct pci_controller *hose, *tmp;
 
-	for (hose=hose_head;hose;hose=hose->next) 
+	list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
 		remap_bus_range(hose->bus);
 }
 
@@ -764,8 +764,8 @@ struct pci_controller*
 pci_find_hose_for_OF_device(struct device_node *node)
 {
 	while (node) {
-		struct pci_controller *hose;
-		for (hose=hose_head;hose;hose=hose->next)
+		struct pci_controller *hose, *tmp;
+		list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
 			if (hose->arch_data == node)
 				return hose;
 		node=node->parent;

arch/ppc64/kernel/pci.c

@@ -23,6 +23,7 @@
 #include <linux/bootmem.h>
 #include <linux/module.h>
 #include <linux/mm.h>
+#include <linux/list.h>
 
 #include <asm/processor.h>
 #include <asm/io.h>
@@ -57,8 +58,7 @@ unsigned long pci_io_base;
 
 void iSeries_pcibios_init(void);
 
-struct pci_controller *hose_head;
-struct pci_controller **hose_tail = &hose_head;
+LIST_HEAD(hose_list);
 
 struct pci_dma_ops pci_dma_ops;
 EXPORT_SYMBOL(pci_dma_ops);
@@ -221,9 +221,9 @@ pci_alloc_pci_controller(enum phb_types controller_type)
 		memcpy(hose->what,model,7);
         hose->type = controller_type;
         hose->global_number = global_phb_number++;
-        
-        *hose_tail = hose;
-        hose_tail = &hose->next;
+
+	list_add_tail(&hose->list_node, &hose_list);
+
         return hose;
 }
 
@@ -263,7 +263,7 @@ static void __init pcibios_claim_of_setup(void)
 
 static int __init pcibios_init(void)
 {
-	struct pci_controller *hose;
+	struct pci_controller *hose, *tmp;
 	struct pci_bus *bus;
 
 #ifdef CONFIG_PPC_ISERIES
@@ -274,7 +274,7 @@ static int __init pcibios_init(void)
 	printk("PCI: Probing PCI hardware\n");
 
 	/* Scan all of the recorded PCI controllers.  */
-	for (hose = hose_head; hose; hose = hose->next) {
+	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 		hose->last_busno = 0xff;
 		bus = pci_scan_bus(hose->first_busno, hose->ops,
 				   hose->arch_data);

arch/ppc64/kernel/pci.h

@@ -17,9 +17,7 @@ extern unsigned long isa_io_base;
 extern struct pci_controller* pci_alloc_pci_controller(enum phb_types controller_type);
 extern struct pci_controller* pci_find_hose_for_OF_device(struct device_node* node);
 
-extern struct pci_controller* hose_head;
-extern struct pci_controller** hose_tail;
-
+extern struct list_head hose_list;
 extern int global_phb_number;
 
 /*******************************************************************

arch/ppc64/kernel/pci_dn.c

@@ -129,10 +129,10 @@ void *traverse_pci_devices(struct device_node *start, traverse_func pre,
  */
 static void *traverse_all_pci_devices(traverse_func pre)
 {
-	struct pci_controller *phb;
+	struct pci_controller *phb, *tmp;
 	void *ret;
 
-	for (phb = hose_head; phb; phb = phb->next)
+	list_for_each_entry_safe(phb, tmp, &hose_list, list_node)
 		if ((ret = traverse_pci_devices(phb->arch_data, pre, phb))
 				!= NULL)
 			return ret;

arch/ppc64/kernel/pmac_pci.c

@@ -672,9 +672,9 @@ void __init pmac_pcibios_fixup(void)
 
 static void __init pmac_fixup_phb_resources(void)
 {
-	struct pci_controller *hose;
+	struct pci_controller *hose, *tmp;
 	
-	for (hose = hose_head; hose; hose = hose->next) {
+	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 		unsigned long offset = (unsigned long)hose->io_base_virt - pci_io_base;
 		hose->io_resource.start += offset;
 		hose->io_resource.end += offset;

include/asm-ppc64/pci-bridge.h

@@ -33,9 +33,9 @@ enum phb_types {
 struct pci_controller {
 	char what[8];                     /* Eye catcher      */
 	enum phb_types type;              /* Type of hardware */
-	struct pci_controller *next;
 	struct pci_bus *bus;
 	void *arch_data;
+	struct list_head list_node;
 
 	int first_busno;
 	int last_busno;