powerpc/eeh: Introduce eeh_for_each_pe()

Add a for_each-style macro for iterating through PEs without the
boilerplate required by a traversal function. eeh_pe_next() is now
exported, as it is now used directly in place.
Signed-off-by: Sam Bobroff <sbobroff@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/eeh.h

@@ -106,6 +106,9 @@ struct eeh_pe {
 #define eeh_pe_for_each_dev(pe, edev, tmp) \
 		list_for_each_entry_safe(edev, tmp, &pe->edevs, list)
 
+#define eeh_for_each_pe(root, pe) \
+	for (pe = root; pe; pe = eeh_pe_next(pe, root))
+
 static inline bool eeh_pe_passed(struct eeh_pe *pe)
 {
 	return pe ? !!atomic_read(&pe->pass_dev_cnt) : false;
@@ -267,6 +270,7 @@ typedef void *(*eeh_pe_traverse_func)(struct eeh_pe *pe, void *flag);
 void eeh_set_pe_aux_size(int size);
 int eeh_phb_pe_create(struct pci_controller *phb);
 struct eeh_pe *eeh_phb_pe_get(struct pci_controller *phb);
+struct eeh_pe *eeh_pe_next(struct eeh_pe *pe, struct eeh_pe *root);
 struct eeh_pe *eeh_pe_get(struct pci_controller *phb,
 			  int pe_no, int config_addr);
 int eeh_add_to_parent_pe(struct eeh_dev *edev);

arch/powerpc/kernel/eeh_pe.c

@@ -142,8 +142,7 @@ struct eeh_pe *eeh_phb_pe_get(struct pci_controller *phb)
  * The function is used to retrieve the next PE in the
  * hierarchy PE tree.
  */
-static struct eeh_pe *eeh_pe_next(struct eeh_pe *pe,
-				  struct eeh_pe *root)
+struct eeh_pe *eeh_pe_next(struct eeh_pe *pe, struct eeh_pe *root)
 {
 	struct list_head *next = pe->child_list.next;
 
@@ -178,7 +177,7 @@ void *eeh_pe_traverse(struct eeh_pe *root,
 	struct eeh_pe *pe;
 	void *ret;
 
-	for (pe = root; pe; pe = eeh_pe_next(pe, root)) {
+	eeh_for_each_pe(root, pe) {
 		ret = fn(pe, flag);
 		if (ret) return ret;
 	}
@@ -209,7 +208,7 @@ void *eeh_pe_dev_traverse(struct eeh_pe *root,
 	}
 
 	/* Traverse root PE */
-	for (pe = root; pe; pe = eeh_pe_next(pe, root)) {
+	eeh_for_each_pe(root, pe) {
 		eeh_pe_for_each_dev(pe, edev, tmp) {
 			ret = fn(edev, flag);
 			if (ret)