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    Subject[PATCH v2 01/29] PCI: add helpers for building PCI bus resource lists
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    We'd like to supply a list of resources when we create a new PCI bus,
    e.g., the root bus under a PCI host bridge. These are helpers for
    constructing that list.

    Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
    ---
    drivers/pci/bus.c | 30 +++++++++++++++++++++++++-----
    include/linux/pci.h | 2 ++
    2 files changed, 27 insertions(+), 5 deletions(-)

    diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
    index 1e2ad92..79fc31a 100644
    --- a/drivers/pci/bus.c
    +++ b/drivers/pci/bus.c
    @@ -18,6 +18,30 @@

    #include "pci.h"

    +void pci_add_resource(struct list_head *resources, struct resource *res)
    +{
    + struct pci_bus_resource *bus_res;
    +
    + bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL);
    + if (!bus_res) {
    + printk(KERN_ERR "PCI: can't add bus resource %pR\n", res);
    + return;
    + }
    +
    + bus_res->res = res;
    + list_add_tail(&bus_res->list, resources);
    +}
    +
    +void pci_free_resource_list(struct list_head *resources)
    +{
    + struct pci_bus_resource *bus_res, *tmp;
    +
    + list_for_each_entry_safe(bus_res, tmp, resources, list) {
    + list_del(&bus_res->list);
    + kfree(bus_res);
    + }
    +}
    +
    void pci_bus_add_resource(struct pci_bus *bus, struct resource *res,
    unsigned int flags)
    {
    @@ -52,16 +76,12 @@ EXPORT_SYMBOL_GPL(pci_bus_resource_n);

    void pci_bus_remove_resources(struct pci_bus *bus)
    {
    - struct pci_bus_resource *bus_res, *tmp;
    int i;

    for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
    bus->resource[i] = NULL;

    - list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) {
    - list_del(&bus_res->list);
    - kfree(bus_res);
    - }
    + pci_free_resource_list(&bus->resources);
    }

    /**
    diff --git a/include/linux/pci.h b/include/linux/pci.h
    index 9fc0122..6841e7f 100644
    --- a/include/linux/pci.h
    +++ b/include/linux/pci.h
    @@ -907,6 +907,8 @@ int pci_request_selected_regions_exclusive(struct pci_dev *, int, const char *);
    void pci_release_selected_regions(struct pci_dev *, int);

    /* drivers/pci/bus.c */
    +void pci_add_resource(struct list_head *resources, struct resource *res);
    +void pci_free_resource_list(struct list_head *resources);
    void pci_bus_add_resource(struct pci_bus *bus, struct resource *res, unsigned int flags);
    struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n);
    void pci_bus_remove_resources(struct pci_bus *bus);


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