parisc: fix wrong assumption about bus->self

Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> posted a patch series
to linux-pci to fix a wrong assumption about pci_bus->self==NULL for
all PCI host bus controllers. While PARISC platforms to not behave
this way, I prefer to have the code consistent across architectures.
The following patch replaces pci_bus->self with pci_bus->parent when
used as a test to check for "root bus controller".
Signed-off-by: NGrant Grundler <grundler@parisc-linux.org>
Signed-off-by: NKyle McMartin <kyle@mcmartin.ca>

drivers/parisc/dino.c

@@ -587,7 +587,7 @@ dino_fixup_bus(struct pci_bus *bus)
 			bus->resource[i+1] = &res[i];
 		}
 
-	} else if(bus->self) {
+	} else if (bus->parent) {
 		int i;
 
 		pci_read_bridge_bases(bus);

drivers/parisc/iosapic.c

@@ -487,7 +487,7 @@ iosapic_xlate_pin(struct iosapic_info *isi, struct pci_dev *pcidev)
 	}
 
 	/* Check if pcidev behind a PPB */
-	if (NULL != pcidev->bus->self) {
+	if (pcidev->bus->parent) {
 		/* Convert pcidev INTR_PIN into something we
 		** can lookup in the IRT.
 		*/
@@ -523,10 +523,9 @@ iosapic_xlate_pin(struct iosapic_info *isi, struct pci_dev *pcidev)
 #endif /* PCI_BRIDGE_FUNCS */
 
 		/*
-		** Locate the host slot the PPB nearest the Host bus
-		** adapter.
+		 * Locate the host slot of the PPB.
 		 */
-		while (NULL != p->parent->self)
+		while (p->parent->parent)
 			p = p->parent;
 
 		intr_slot = PCI_SLOT(p->self->devfn);

drivers/parisc/lba_pci.c

@@ -644,7 +644,7 @@ lba_fixup_bus(struct pci_bus *bus)
 	** Properly Setup MMIO resources for this bus.
 	** pci_alloc_primary_bus() mangles this.
 	*/
-	if (bus->self) {
+	if (bus->parent) {
 		int i;
 		/* PCI-PCI Bridge */
 		pci_read_bridge_bases(bus);
@@ -802,7 +802,7 @@ lba_fixup_bus(struct pci_bus *bus)
 ** Can't fixup here anyway....garr...
 */
 	if (fbb_enable) {
-		if (bus->self) {
+		if (bus->parent) {
 			u8 control;
 			/* enable on PPB */
 			(void) pci_read_config_byte(bus->self, PCI_BRIDGE_CONTROL, &control);