powerpc/pci: Move pci_find_bus_by_node() around

This moves pci_find_bus_by_node() from arch/powerpc/platforms/
pseries/pci_dlpar.c to arch/powerpc/kernel/pci-hotplug.c so that
the function can be used by pSeries and PowerNV platform at the
same time. Also, below cleanup applied. No functional changes
introduced.

   * Remove variable "busdn" in find_bus_among_children()
   * Use PCI_DN() to convert device node to pci_dn

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/kernel/pci-hotplug.c b/arch/powerpc/kernel/pci-hotplug.c
index 2d108e5..46587a1 100644 (file)
--- a/arch/powerpc/kernel/pci-hotplug.c
+++ b/arch/powerpc/kernel/pci-hotplug.c
@@ -21,6 +21,35 @@
 #include <asm/firmware.h>
 #include <asm/eeh.h>
 
+static struct pci_bus *find_bus_among_children(struct pci_bus *bus,
+                                              struct device_node *dn)
+{
+       struct pci_bus *child = NULL;
+       struct pci_bus *tmp;
+
+       if (pci_bus_to_OF_node(bus) == dn)
+               return bus;
+
+       list_for_each_entry(tmp, &bus->children, node) {
+               child = find_bus_among_children(tmp, dn);
+               if (child)
+                       break;
+       }
+
+       return child;
+}
+
+struct pci_bus *pci_find_bus_by_node(struct device_node *dn)
+{
+       struct pci_dn *pdn = PCI_DN(dn);
+
+       if (!pdn  || !pdn->phb || !pdn->phb->bus)
+               return NULL;
+
+       return find_bus_among_children(pdn->phb->bus, dn);
+}
+EXPORT_SYMBOL_GPL(pci_find_bus_by_node);
+
 /**
  * pcibios_release_device - release PCI device
  * @dev: PCI device

diff --git a/arch/powerpc/platforms/pseries/pci_dlpar.c b/arch/powerpc/platforms/pseries/pci_dlpar.c
index aee22b4..906dbaa 100644 (file)
--- a/arch/powerpc/platforms/pseries/pci_dlpar.c
+++ b/arch/powerpc/platforms/pseries/pci_dlpar.c
@@ -34,37 +34,6 @@
 
 #include "pseries.h"
 
-static struct pci_bus *
-find_bus_among_children(struct pci_bus *bus,
-                        struct device_node *dn)
-{
-       struct pci_bus *child = NULL;
-       struct pci_bus *tmp;
-       struct device_node *busdn;
-
-       busdn = pci_bus_to_OF_node(bus);
-       if (busdn == dn)
-               return bus;
-
-       list_for_each_entry(tmp, &bus->children, node) {
-               child = find_bus_among_children(tmp, dn);
-               if (child)
-                       break;
-       };
-       return child;
-}
-
-struct pci_bus *pci_find_bus_by_node(struct device_node *dn)
-{
-       struct pci_dn *pdn = dn->data;
-
-       if (!pdn  || !pdn->phb || !pdn->phb->bus)
-               return NULL;
-
-       return find_bus_among_children(pdn->phb->bus, dn);
-}
-EXPORT_SYMBOL_GPL(pci_find_bus_by_node);
-
 struct pci_controller *init_phb_dynamic(struct device_node *dn)
 {
        struct pci_controller *phb;