Export pci_alloc_child_bus(), and make it be able to handle buses without
bridge devices. Some devices such as SR-IOV devices use more than one bus
number while there is no explicit bridge devices since they have internal
routing mechanism.
Signed-off-by: Yu Zhao <yu.zhao@xxxxxxxxx>
---
drivers/pci/pci.h | 2 ++
drivers/pci/probe.c | 9 ++++++---
2 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 922b742..c6fa8ab 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -159,6 +159,8 @@ enum pci_bar_type {
extern int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
struct resource *res, unsigned int reg);
+extern struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
+ struct pci_dev *bridge, int busnr);
extern void pci_enable_ari(struct pci_dev *dev);
/**
* pci_ari_enabled - query ARI forwarding status
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 2326609..9c680b8 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -454,7 +454,7 @@ static struct pci_bus * pci_alloc_bus(void)
return b;
}
-static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
+struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
struct pci_dev *bridge, int busnr)
{
struct pci_bus *child;
@@ -467,12 +467,10 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
if (!child)
return NULL;
- child->self = bridge;
child->parent = parent;
child->ops = parent->ops;
child->sysdata = parent->sysdata;
child->bus_flags = parent->bus_flags;
- child->bridge = get_device(&bridge->dev);
/* initialize some portions of the bus device, but don't register it
* now as the parent is not properly set up yet. This device will get
@@ -489,6 +487,11 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
child->primary = parent->secondary;
child->subordinate = 0xff;
+ if (!bridge)
+ return child;
+
+ child->self = bridge;
+ child->bridge = get_device(&bridge->dev);
/* Set up default resource pointers and names.. */
for (i = 0; i < PCI_BRIDGE_RES_NUM; i++) {
child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
--
1.5.6.4
--
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