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    Subject[PATCH 12/14] pci: pci_bridge_release_res
    prepare for pciehp_realloc

    it will clear the resource size for bridge

    -v2: patrick Keller pointed out need to export it...

    Signed-off-by: Yinghai Lu <yinghai@kernel.org>
    ---
    drivers/pci/setup-bus.c | 43 +++++++++++++++++++++++++++++++++++++++++++
    include/linux/pci.h | 1 +
    2 files changed, 44 insertions(+), 0 deletions(-)

    diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
    index cc3474e..4c61b8c 100644
    --- a/drivers/pci/setup-bus.c
    +++ b/drivers/pci/setup-bus.c
    @@ -742,6 +742,49 @@ static void __ref __pci_bridge_assign_resources(const struct pci_dev *bridge,
    break;
    }
    }
    +
    +void pci_bridge_release_res(struct pci_bus *bus)
    +{
    + int idx;
    + bool changed = false;
    + struct pci_dev *dev;
    + struct resource *r;
    +
    + /* The root bus? */
    + if (!bus->self)
    + return;
    +
    + /* for pci bridges res only */
    + dev = bus->self;
    + if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
    + return;
    +
    + for (idx = PCI_BRIDGE_RESOURCES; idx < PCI_BRIDGE_RESOURCES + 3;
    + idx++) {
    + r = &dev->resource[idx];
    + if (!r->parent)
    + continue;
    +
    + /* if there are children under that, we should not release it */
    + if (r->child)
    + continue;
    +
    + if (!release_resource(r)) {
    + dev_printk(KERN_DEBUG, &dev->dev,
    + "resource %d %pR released\n", idx, r);
    + /* old size is not kept */
    + r->start = 0;
    + r->end = 0;
    + r->flags = 0;
    + changed = true;
    + }
    + }
    +
    + if (changed)
    + pci_setup_bridge(bus);
    +}
    +EXPORT_SYMBOL_GPL(pci_bridge_release_res);
    +
    static void pci_bridge_release_unused_res(struct pci_bus *bus,
    unsigned long type)
    {
    diff --git a/include/linux/pci.h b/include/linux/pci.h
    index 31fec6f..4b8d35a 100644
    --- a/include/linux/pci.h
    +++ b/include/linux/pci.h
    @@ -770,6 +770,7 @@ int pci_vpd_truncate(struct pci_dev *dev, size_t size);
    void pci_bus_assign_resources(const struct pci_bus *bus);
    void pci_bus_size_bridges(struct pci_bus *bus);
    int pci_claim_resource(struct pci_dev *, int);
    +void pci_bridge_release_res(struct pci_bus *bus);
    void pci_assign_unassigned_resources(void);
    void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge);
    void pdev_enable_device(struct pci_dev *);
    --
    1.6.0.2


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