It is main portion of pci_rescan_bus().
Separate it out and prepare to use it for pci root bus hot add later.
Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
---
drivers/pci/setup-bus.c | 32 ++++++++++++++++++--------------
include/linux/pci.h | 1 +
2 files changed, 19 insertions(+), 14 deletions(-)
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 1e808ca..1f34929 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1550,25 +1550,12 @@ enable_all:
}
EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources);
-#ifdef CONFIG_HOTPLUG
-/**
- * pci_rescan_bus - scan a PCI bus for devices.
- * @bus: PCI bus to scan
- *
- * Scan a PCI bus and child buses for new devices, adds them,
- * and enables them.
- *
- * Returns the max number of subordinate bus discovered.
- */
-unsigned int __ref pci_rescan_bus(struct pci_bus *bus)
+void pci_assign_unassigned_bus_resources(struct pci_bus *bus)
{
- unsigned int max;
struct pci_dev *dev;
LIST_HEAD(add_list); /* list of resources that
want additional resources */
- max = pci_scan_child_bus(bus);
-
down_read(&pci_bus_sem);
list_for_each_entry(dev, &bus->devices, bus_list)
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
@@ -1581,6 +1568,23 @@ unsigned int __ref pci_rescan_bus(struct pci_bus *bus)
BUG_ON(!list_empty(&add_list));
pci_enable_bridges(bus);
+}
+#ifdef CONFIG_HOTPLUG
+/**
+ * pci_rescan_bus - scan a PCI bus for devices.
+ * @bus: PCI bus to scan
+ *
+ * Scan a PCI bus and child buses for new devices, adds them,
+ * and enables them.
+ *
+ * Returns the max number of subordinate bus discovered.
+ */
+unsigned int __ref pci_rescan_bus(struct pci_bus *bus)
+{
+ unsigned int max;
+
+ max = pci_scan_child_bus(bus);
+ pci_assign_unassigned_bus_resources(bus);
pci_bus_add_devices(bus);
return max;
diff --git a/include/linux/pci.h b/include/linux/pci.h
index be1de01..505c05a 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -980,6 +980,7 @@ void pci_bus_size_bridges(struct pci_bus *bus);
int pci_claim_resource(struct pci_dev *, int);
void pci_assign_unassigned_resources(void);
void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge);
+void pci_assign_unassigned_bus_resources(struct pci_bus *bus);
void pdev_enable_device(struct pci_dev *);
int pci_enable_resources(struct pci_dev *, int mask);
void pci_fixup_irqs(u8 (*)(struct pci_dev *, u8 *),
--
1.7.7
--
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