From: Luca Coelho <luciano.coelho@xxxxxxxxx>
This function was introduced in v4.9 and added to 3.12.69, 4.4.37 and
4.8.13.
Signed-off-by: Luca Coelho <luciano.coelho@xxxxxxxxx>
---
backport/backport-include/linux/pci.h | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/backport/backport-include/linux/pci.h b/backport/backport-include/linux/pci.h
index 81c2d57a3454..67ac40fcbf58 100644
--- a/backport/backport-include/linux/pci.h
+++ b/backport/backport-include/linux/pci.h
@@ -184,4 +184,25 @@ static inline int pci_enable_msix_exact(struct pci_dev *dev,
#endif
#endif /* CONFIG_PCI */
+#if LINUX_VERSION_IS_LESS(4,9,0) && \
+ !LINUX_VERSION_IN_RANGE(3,12,69, 3,13,0) && \
+ !LINUX_VERSION_IN_RANGE(4,4,37, 4,5,0) && \
+ !LINUX_VERSION_IN_RANGE(4,8,13, 4,9,0)
+
+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;
+}
+
+#endif/* <4.9.0 but not >= 3.12.69, 4.4.37, 4.8.13 */
+
#endif /* _BACKPORT_LINUX_PCI_H */
--
2.15.1
--
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