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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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