powerpc/pci: Export pci_add_device_node_info()

This renames update_dn_pci_info() to pci_add_device_node_info()
with corresponding adjustment on the parameter type and exports it.
The function is used to create pdn (struct pci_dn) for the indicated
device node. Another function add_pdn(), almost wrapper of
pci_add_device_node_info(), to be used in traverse_pci_devices(). No
logical changes introduced.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/pci-bridge.h

@@ -235,7 +235,8 @@ extern struct pci_dn *pci_get_pdn_by_devfn(struct pci_bus *bus,
 extern struct pci_dn *pci_get_pdn(struct pci_dev *pdev);
 extern struct pci_dn *add_dev_pci_data(struct pci_dev *pdev);
 extern void remove_dev_pci_data(struct pci_dev *pdev);
-extern void *update_dn_pci_info(struct device_node *dn, void *data);
+extern struct pci_dn *pci_add_device_node_info(struct pci_controller *hose,
+					       struct device_node *dn);
 
 static inline int pci_device_from_OF_node(struct device_node *np,
 					  u8 *bus, u8 *devfn)

arch/powerpc/kernel/pci_dn.c

@@ -282,13 +282,9 @@ void remove_dev_pci_data(struct pci_dev *pdev)
 #endif /* CONFIG_PCI_IOV */
 }
 
-/*
- * Traverse_func that inits the PCI fields of the device node.
- * NOTE: this *must* be done before read/write config to the device.
- */
-void *update_dn_pci_info(struct device_node *dn, void *data)
+struct pci_dn *pci_add_device_node_info(struct pci_controller *hose,
+					struct device_node *dn)
 {
-	struct pci_controller *phb = data;
 	const __be32 *type = of_get_property(dn, "ibm,pci-config-space-type", NULL);
 	const __be32 *regs;
 	struct device_node *parent;
@@ -299,7 +295,7 @@ void *update_dn_pci_info(struct device_node *dn, void *data)
 		return NULL;
 	dn->data = pdn;
 	pdn->node = dn;
-	pdn->phb = phb;
+	pdn->phb = hose;
 #ifdef CONFIG_PPC_POWERNV
 	pdn->pe_number = IODA_INVALID_PE;
 #endif
@@ -331,8 +327,9 @@ void *update_dn_pci_info(struct device_node *dn, void *data)
 	if (pdn->parent)
 		list_add_tail(&pdn->list, &pdn->parent->child_list);
 
-	return NULL;
+	return pdn;
 }
+EXPORT_SYMBOL_GPL(pci_add_device_node_info);
 
 /*
  * Traverse a device tree stopping each PCI device in the tree.
@@ -432,6 +429,18 @@ void *traverse_pci_dn(struct pci_dn *root,
 	return NULL;
 }
 
+static void *add_pdn(struct device_node *dn, void *data)
+{
+	struct pci_controller *hose = data;
+	struct pci_dn *pdn;
+
+	pdn = pci_add_device_node_info(hose, dn);
+	if (!pdn)
+		return ERR_PTR(-ENOMEM);
+
+	return NULL;
+}
+
 /** 
  * pci_devs_phb_init_dynamic - setup pci devices under this PHB
  * phb: pci-to-host bridge (top-level bridge connecting to cpu)
@@ -446,8 +455,7 @@ void pci_devs_phb_init_dynamic(struct pci_controller *phb)
 	struct pci_dn *pdn;
 
 	/* PHB nodes themselves must not match */
-	update_dn_pci_info(dn, phb);
-	pdn = dn->data;
+	pdn = pci_add_device_node_info(phb, dn);
 	if (pdn) {
 		pdn->devfn = pdn->busno = -1;
 		pdn->vendor_id = pdn->device_id = pdn->class_code = 0;
@@ -456,7 +464,7 @@ void pci_devs_phb_init_dynamic(struct pci_controller *phb)
 	}
 
 	/* Update dn->phb ptrs for new phb and children devices */
-	traverse_pci_devices(dn, update_dn_pci_info, phb);
+	traverse_pci_devices(dn, add_pdn, phb);
 }
 
 /** 

arch/powerpc/platforms/pseries/setup.c

@@ -267,7 +267,7 @@ static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long act
 		pdn = parent ? PCI_DN(parent) : NULL;
 		if (pdn) {
 			/* Create pdn and EEH device */
-			update_dn_pci_info(np, pdn->phb);
+			pci_add_device_node_info(pdn->phb, np);
 			eeh_dev_init(PCI_DN(np), pdn->phb);
 		}