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PCI: add generic pci_hp_add_bridge()

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This creates a generic pci_hp_add_bridge() that can be used by several
hotplug drivers.

[bhelgaas: split out from pciehp patch]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Yinghai Lu 2012-05-18 13:46:34 -06:00 committed by Bjorn Helgaas
parent 85019faf4a
commit a8e4b9c101
2 changed files with 24 additions and 0 deletions
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23
drivers/pci/hotplug-pci.c
View File

@ -4,6 +4,29 @@
#include <linux/export.h> #include <linux/export.h>
#include "pci.h" #include "pci.h"
int __ref pci_hp_add_bridge(struct pci_dev *dev)
{
struct pci_bus *parent = dev->bus;
int pass, busnr, start = parent->busn_res.start;
int end = parent->busn_res.end;
for (busnr = start; busnr <= end; busnr++) {
if (!pci_find_bus(pci_domain_nr(parent), busnr))
break;
}
if (busnr-- > end) {
printk(KERN_ERR "No bus number available for hot-added bridge %s\n",
pci_name(dev));
return -1;
}
for (pass = 0; pass < 2; pass++)
busnr = pci_scan_bridge(parent, dev, busnr, pass);
if (!dev->subordinate)
return -1;
return 0;
}
EXPORT_SYMBOL_GPL(pci_hp_add_bridge);
unsigned int __devinit pci_do_scan_bus(struct pci_bus *bus) unsigned int __devinit pci_do_scan_bus(struct pci_bus *bus)
{ {

1
drivers/pci/pci.h
View File

@ -124,6 +124,7 @@ static inline int pci_proc_detach_bus(struct pci_bus *bus) { return 0; }
#endif #endif
/* Functions for PCI Hotplug drivers to use */ /* Functions for PCI Hotplug drivers to use */
int pci_hp_add_bridge(struct pci_dev *dev);
extern unsigned int pci_do_scan_bus(struct pci_bus *bus); extern unsigned int pci_do_scan_bus(struct pci_bus *bus);
#ifdef HAVE_PCI_LEGACY #ifdef HAVE_PCI_LEGACY