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authorYijing Wang <wangyijing@huawei.com>2014-05-04 12:23:37 +0800
committerBjorn Helgaas <bhelgaas@google.com>2014-05-27 12:21:02 -0600
commit1c86438c9423a26cc9f7f74a8950d9cf9c93bc23 (patch)
treefe11430099b131d8517fd6e2fed0bcdcaa4df303 /include/linux/pci.h
parent326c1cdae74186bfab3464e8f3378c7fa324be12 (diff)
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PCI: Add new pci_is_bridge() interface
Add a helper function to check a device's header type for PCI bridge or CardBus bridge. Requires: 326c1cdae741 PCI: Rename pci_is_bridge() to pci_has_subordinate() Signed-off-by: Yijing Wang <wangyijing@huawei.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'include/linux/pci.h')
-rw-r--r--include/linux/pci.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h
index aab57b4abe7f..f2a5946ea0bf 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -477,6 +477,19 @@ static inline bool pci_is_root_bus(struct pci_bus *pbus)
return !(pbus->parent);
}
+/**
+ * pci_is_bridge - check if the PCI device is a bridge
+ * @dev: PCI device
+ *
+ * Return true if the PCI device is bridge whether it has subordinate
+ * or not.
+ */
+static inline bool pci_is_bridge(struct pci_dev *dev)
+{
+ return dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
+ dev->hdr_type == PCI_HEADER_TYPE_CARDBUS;
+}
+
static inline struct pci_dev *pci_upstream_bridge(struct pci_dev *dev)
{
dev = pci_physfn(dev);