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>
diff --git a/include/linux/pci.h b/include/linux/pci.h
index aab57b4..f2a5946 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -477,6 +477,19 @@
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);