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: Grant Grundler <grundler@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>

1 files changed, 4 insertions, 5 deletions

diff --git a/drivers/parisc/iosapic.c b/drivers/parisc/iosapic.c
index 0797659ee016..1cdfdea5d7ef 100644
--- a/drivers/parisc/iosapic.c
+++ b/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.
-                */
-                while (NULL != p->parent->self)
+                 * Locate the host slot of the PPB.
+                 */
+                while (p->parent->parent)
                         p = p->parent;
 
                 intr_slot = PCI_SLOT(p->self->devfn);