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PCI: Separate out pci_assign_unassigned_bus_resources() 

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@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Yinghai Lu 2012-10-30 14:31:10 -06:00 committed by Bjorn Helgaas
parent 8f0d8163b5
commit 1778794031
2 changed files with 20 additions and 14 deletions
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33
drivers/pci/setup-bus.c
View File

@ -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 +1568,24 @@ 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;

1
include/linux/pci.h
View File

@ -958,6 +958,7 @@ 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 *),