[PATCH RFC v4 4/9] powerpc/pci: Reduce code duplication in pci_add_device_node_info

[Sergey Miroshnichenko]

It is possible now to allocate and fill a new pdn with add_one_dev_pci_data

Signed-off-by: Sergey Miroshnichenko <s.miroshnichenko at yadro.com>
---
 arch/powerpc/kernel/pci_dn.c | 38 +++++++++++++++---------------------
 1 file changed, 16 insertions(+), 22 deletions(-)

diff --git a/arch/powerpc/kernel/pci_dn.c b/arch/powerpc/kernel/pci_dn.c
index 67ccd7be8344..ed1aab424e91 100644
--- a/arch/powerpc/kernel/pci_dn.c
+++ b/arch/powerpc/kernel/pci_dn.c
@@ -159,15 +159,10 @@ static struct pci_dn *add_one_dev_pci_data(struct pci_dn *parent,
 {
 	struct pci_dn *pdn;
 
-	/* Except PHB, we always have the parent */
-	if (!parent)
-		return NULL;
-
 	pdn = kzalloc(sizeof(*pdn), GFP_KERNEL);
 	if (!pdn)
 		return NULL;
 
-	pdn->phb = parent->phb;
 	pdn->parent = parent;
 	pdn->busno = busno;
 	pdn->devfn = devfn;
@@ -177,7 +172,10 @@ static struct pci_dn *add_one_dev_pci_data(struct pci_dn *parent,
 	pdn->pe_number = IODA_INVALID_PE;
 	INIT_LIST_HEAD(&pdn->child_list);
 	INIT_LIST_HEAD(&pdn->list);
-	list_add_tail(&pdn->list, &parent->child_list);
+	if (parent) {
+		pdn->phb = parent->phb;
+		list_add_tail(&pdn->list, &parent->child_list);
+	}
 
 	return pdn;
 }
@@ -346,25 +344,29 @@ struct pci_dn *pci_add_device_node_info(struct pci_controller *hose,
 	const __be32 *regs;
 	struct device_node *parent;
 	struct pci_dn *pdn;
+	int busno = 0, devfn = 0;
 #ifdef CONFIG_EEH
 	struct eeh_dev *edev;
 #endif
 
-	pdn = kzalloc(sizeof(*pdn), GFP_KERNEL);
-	if (pdn == NULL)
-		return NULL;
-	dn->data = pdn;
-	pdn->phb = hose;
-	pdn->pe_number = IODA_INVALID_PE;
 	regs = of_get_property(dn, "reg", NULL);
 	if (regs) {
 		u32 addr = of_read_number(regs, 1);
 
 		/* First register entry is addr (00BBSS00)  */
-		pdn->busno = (addr >> 16) & 0xff;
-		pdn->devfn = (addr >> 8) & 0xff;
+		busno = (addr >> 16) & 0xff;
+		devfn = (addr >> 8) & 0xff;
 	}
 
+	parent = of_get_parent(dn);
+	pdn = add_one_dev_pci_data(parent ? PCI_DN(parent) : NULL,
+				   0, busno, devfn);
+	if (!pdn)
+		return NULL;
+
+	dn->data = pdn;
+	pdn->phb = hose;
+
 	/* vendor/device IDs and class code */
 	regs = of_get_property(dn, "vendor-id", NULL);
 	pdn->vendor_id = regs ? of_read_number(regs, 1) : 0;
@@ -385,14 +387,6 @@ struct pci_dn *pci_add_device_node_info(struct pci_controller *hose,
 	}
 #endif
 
-	/* Attach to parent node */
-	INIT_LIST_HEAD(&pdn->child_list);
-	INIT_LIST_HEAD(&pdn->list);
-	parent = of_get_parent(dn);
-	pdn->parent = parent ? PCI_DN(parent) : NULL;
-	if (pdn->parent)
-		list_add_tail(&pdn->list, &pdn->parent->child_list);
-
 	return pdn;
 }
 EXPORT_SYMBOL_GPL(pci_add_device_node_info);
-- 
2.20.1