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PCI: allow pci_alloc_child_bus() to handle a NULL bridge 

Allow pci_alloc_child_bus() to allocate buses without bridge devices.
Some SR-IOV devices can occupy more than one bus number, but there is no
explicit bridges because that have internal routing mechanism.

Signed-off-by: Yu Zhao <yu.zhao@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Yu Zhao 2008-11-22 02:41:07 +08:00 committed by Jesse Barnes
parent 0b400c7ed4
commit 3789fa8a2e
1 changed files with 6 additions and 2 deletions
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8
drivers/pci/probe.c
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@ -398,12 +398,10 @@ 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
@ -420,6 +418,12 @@ 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_RESOURCE_NUM; i++) {
child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];