From: Yinghai Lu <yinghai@xxxxxxxxxx>
use bus_find_device to loop host_bridges.
Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
---
drivers/pci/search.c | 22 ++++++++++++++++++++++
include/linux/pci.h | 3 +++
2 files changed, 25 insertions(+)
diff --git a/drivers/pci/search.c b/drivers/pci/search.c
index bf969ba..5e82905 100644
--- a/drivers/pci/search.c
+++ b/drivers/pci/search.c
@@ -178,6 +178,28 @@ struct pci_dev *pci_get_domain_bus_and_slot(int domain, unsigned int bus,
}
EXPORT_SYMBOL(pci_get_domain_bus_and_slot);
+static int match_pci_host_bridge(struct device *dev, void *data)
+{
+ return 1;
+}
+
+struct pci_bus *pci_get_next_root_bus(struct pci_bus *bus)
+{
+ struct device *dev;
+
+ WARN_ON(in_interrupt());
+ dev = bus_find_device(&pci_host_bridge_bus_type,
+ bus ? bus->bridge : NULL,
+ NULL,
+ match_pci_host_bridge);
+ if (bus)
+ put_device(bus->bridge);
+ if (dev)
+ return to_pci_host_bridge(dev)->bus;
+
+ return NULL;
+}
+
static int match_pci_dev_by_id(struct device *dev, void *data)
{
struct pci_dev *pdev = to_pci_dev(dev);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index be1de01..54e8fa1 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -394,6 +394,8 @@ struct pci_host_bridge {
};
#define to_pci_host_bridge(n) container_of(n, struct pci_host_bridge, dev)
+#define for_each_pci_root_bus(bus) while (bus = pci_get_next_root_bus(bus))
+
void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
void (*release_fn)(struct pci_host_bridge *),
void *release_data);
@@ -757,6 +759,7 @@ int pci_find_ht_capability(struct pci_dev *dev, int ht_cap);
int pci_find_next_ht_capability(struct pci_dev *dev, int pos, int ht_cap);
struct pci_bus *pci_find_next_bus(const struct pci_bus *from);
+struct pci_bus *pci_get_next_root_bus(struct pci_bus *from);
struct pci_dev *pci_get_device(unsigned int vendor, unsigned int device,
struct pci_dev *from);
struct pci_dev *pci_get_subsys(unsigned int vendor, unsigned int device,
--
1.7.9.5
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