[PATCH v8 4/7] PCI: Add helper functions pci_get[put]_host_bridge_device()

[Murali Karicheri]

Add helper functions to get/put the root bus's host bridge device.

Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx> (AMD Seattle)
Signed-off-by: Murali Karicheri <m-karicheri2@xxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Acked-by: Will Deacon <will.deacon@xxxxxxx>
CC: Joerg Roedel <joro@xxxxxxxxxx>
CC: Grant Likely <grant.likely@xxxxxxxxxx>
CC: Rob Herring <robh+dt@xxxxxxxxxx>
CC: Russell King <linux@xxxxxxxxxxxxxxxx>
CC: Arnd Bergmann <arnd@xxxxxxxx>
---
 drivers/pci/host-bridge.c |   14 ++++++++++++++
 include/linux/pci.h       |    3 +++
 2 files changed, 17 insertions(+)

diff --git a/drivers/pci/host-bridge.c b/drivers/pci/host-bridge.c
index 39b2dbe..3e5bbf9 100644
--- a/drivers/pci/host-bridge.c
+++ b/drivers/pci/host-bridge.c
@@ -23,6 +23,20 @@ static struct pci_host_bridge *find_pci_host_bridge(struct pci_bus *bus)
 	return to_pci_host_bridge(root_bus->bridge);
 }
 
+struct device *pci_get_host_bridge_device(struct pci_dev *dev)
+{
+	struct pci_bus *root_bus = find_pci_root_bus(dev->bus);
+	struct device *bridge = root_bus->bridge;
+
+	kobject_get(&bridge->kobj);
+	return bridge;
+}
+
+void  pci_put_host_bridge_device(struct device *dev)
+{
+	kobject_put(&dev->kobj);
+}
+
 void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
 				 void (*release_fn)(struct pci_host_bridge *),
 				 void *release_data)
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 211e9da..a379513 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -510,6 +510,9 @@ static inline struct pci_dev *pci_upstream_bridge(struct pci_dev *dev)
 	return dev->bus->self;
 }
 
+struct device *pci_get_host_bridge_device(struct pci_dev *dev);
+void pci_put_host_bridge_device(struct device *dev);
+
 #ifdef CONFIG_PCI_MSI
 static inline bool pci_dev_msi_enabled(struct pci_dev *pci_dev)
 {
-- 
1.7.9.5

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