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Subject[PATCH 4/15 v5] PCI: make pci_alloc_child_bus() be able to handle NULL bridge
Make pci_alloc_child_bus() 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.

Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Grant Grundler <grundler@parisc-linux.org>
Cc: Alex Chiang <achiang@hp.com>
Cc: Matthew Wilcox <matthew@wil.cx>
Cc: Roland Dreier <rdreier@cisco.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Yu Zhao <yu.zhao@intel.com>

---
drivers/pci/probe.c | 7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index db3e5a7..4b12b58 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -401,12 +401,10 @@ 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
@@ -423,6 +421,11 @@ 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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