Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[linux] / include / linux / pci.h

diff --git a/include/linux/pci.h b/include/linux/pci.h
index f2ba6ac..30d6c16 100644 (file)
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1941,6 +1941,20 @@ static inline int pci_pcie_type(const struct pci_dev *dev)
        return (pcie_caps_reg(dev) & PCI_EXP_FLAGS_TYPE) >> 4;
 }
 
+static inline struct pci_dev *pcie_find_root_port(struct pci_dev *dev)
+{
+       while (1) {
+               if (!pci_is_pcie(dev))
+                       break;
+               if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT)
+                       return dev;
+               if (!dev->bus->self)
+                       break;
+               dev = dev->bus->self;
+       }
+       return NULL;
+}
+
 void pci_request_acs(void);
 bool pci_acs_enabled(struct pci_dev *pdev, u16 acs_flags);
 bool pci_acs_path_enabled(struct pci_dev *start,