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SubjectRe: [PATCH 1/2] pci: pci_bridge_release_res
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On Tue, 2009-12-01 at 01:19 +0000, Yinghai Lu wrote:
> need to apply this after 9/9 patchset
>
> prepare for pciehp_realloc
>
> it will clear the resource size for bridge
>
> Signed-off-by: Yinghai Lu <yinghai@kernel.org>
>
> ---
> drivers/pci/setup-bus.c | 42 ++++++++++++++++++++++++++++++++++++++++++
> include/linux/pci.h | 1 +
> 2 files changed, 43 insertions(+)
>
> Index: linux-2.6/drivers/pci/setup-bus.c
> ===================================================================
> --- linux-2.6.orig/drivers/pci/setup-bus.c
> +++ linux-2.6/drivers/pci/setup-bus.c
> @@ -739,6 +739,48 @@ static void __ref __pci_bridge_assign_re
> 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);
> +}
> +

Need to add EXPORT_SYMBOL(pci_bridge_release_res); here so the hotplug
kernel module will find this function.

> static void release_children_resource(struct resource *r)
> {
> struct resource *p;
> Index: linux-2.6/include/linux/pci.h
> ===================================================================
> --- linux-2.6.orig/include/linux/pci.h
> +++ linux-2.6/include/linux/pci.h
> @@ -767,6 +767,7 @@ int pci_vpd_truncate(struct pci_dev *dev
> 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 *);
> --
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