linux-kernel - [PATCH v5 4/8] PCI: add helper functions pci_get[put]_host_bridge

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Date:	Tue, 27 Jan 2015 16:00:01 -0500
From:	Murali Karicheri <m-karicheri2@...com>
To:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
	<devicetree@...r.kernel.org>, <linux-pci@...r.kernel.org>
CC:	Murali Karicheri <m-karicheri2@...com>,
	Joerg Roedel <joro@...tes.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Will Deacon <will.deacon@....com>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Subject: [PATCH v5 4/8] PCI: add helper functions pci_get[put]_host_bridge_device()

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

Cc: Joerg Roedel <joro@...tes.org>
Cc: Grant Likely <grant.likely@...aro.org>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: Will Deacon <will.deacon@....com>
Cc: Russell King <linux@....linux.org.uk>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: Murali Karicheri <m-karicheri2@...com>
---
 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 0e5f3c9..f58e05b 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 9603094..d677c66 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -513,6 +513,9 @@ 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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