Linux-libre 4.7.1-gnupck-4.7.1-gnu

1 files changed, 38 insertions, 9 deletions

diff --git a/arch/powerpc/kernel/pci-hotplug.c b/arch/powerpc/kernel/pci-hotplug.c
index 59c436189..2d71269e7 100644
--- 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
@@ -38,20 +67,20 @@ void pcibios_release_device(struct pci_dev *dev)
 }
 
 /**
- * pcibios_remove_pci_devices - remove all devices under this bus
+ * pci_hp_remove_devices - remove all devices under this bus
  * @bus: the indicated PCI bus
  *
  * Remove all of the PCI devices under this bus both from the
  * linux pci device tree, and from the powerpc EEH address cache.
  */
-void pcibios_remove_pci_devices(struct pci_bus *bus)
+void pci_hp_remove_devices(struct pci_bus *bus)
 {
 	struct pci_dev *dev, *tmp;
 	struct pci_bus *child_bus;
 
 	/* First go down child busses */
 	list_for_each_entry(child_bus, &bus->children, node)
-		pcibios_remove_pci_devices(child_bus);
+		pci_hp_remove_devices(child_bus);
 
 	pr_debug("PCI: Removing devices on bus %04x:%02x\n",
 		 pci_domain_nr(bus),  bus->number);
@@ -60,11 +89,10 @@ void pcibios_remove_pci_devices(struct pci_bus *bus)
 		pci_stop_and_remove_bus_device(dev);
 	}
 }
-
-EXPORT_SYMBOL_GPL(pcibios_remove_pci_devices);
+EXPORT_SYMBOL_GPL(pci_hp_remove_devices);
 
 /**
- * pcibios_add_pci_devices - adds new pci devices to bus
+ * pci_hp_add_devices - adds new pci devices to bus
  * @bus: the indicated PCI bus
  *
  * This routine will find and fixup new pci devices under
@@ -74,7 +102,7 @@ EXPORT_SYMBOL_GPL(pcibios_remove_pci_devices);
  * is how this routine differs from other, similar pcibios
  * routines.)
  */
-void pcibios_add_pci_devices(struct pci_bus * bus)
+void pci_hp_add_devices(struct pci_bus *bus)
 {
 	int slotno, mode, pass, max;
 	struct pci_dev *dev;
@@ -92,7 +120,8 @@ void pcibios_add_pci_devices(struct pci_bus * bus)
 	if (mode == PCI_PROBE_DEVTREE) {
 		/* use ofdt-based probe */
 		of_rescan_bus(dn, bus);
-	} else if (mode == PCI_PROBE_NORMAL) {
+	} else if (mode == PCI_PROBE_NORMAL &&
+		   dn->child && PCI_DN(dn->child)) {
 		/*
 		 * Use legacy probe. In the partial hotplug case, we
 		 * probably have grandchildren devices unplugged. So
@@ -114,4 +143,4 @@ void pcibios_add_pci_devices(struct pci_bus * bus)
 	}
 	pcibios_finish_adding_to_bus(bus);
 }
-EXPORT_SYMBOL_GPL(pcibios_add_pci_devices);
+EXPORT_SYMBOL_GPL(pci_hp_add_devices);