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Commit 1c86438c authored by Yijing Wang's avatar Yijing Wang Committed by Bjorn Helgaas
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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: 326c1cda PCI: Rename pci_is_bridge() to pci_has_subordinate()
Signed-off-by: default avatarYijing Wang <wangyijing@huawei.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent 326c1cda

include/linux/pci.h

+13 −0
Original line number Diff line number Diff line
@@ -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);