The behavior of of_get_mac_address() changed in kernel 5.2, it now
returns an error code and not NULL in case of an error.
This was changed in upstream kernel commit d01f449c008a
("of_net: add NVMEM support to of_get_mac_address")
Signed-off-by: Hauke Mehrtens <hauke@xxxxxxxxxx>
---
backport/backport-include/linux/of_net.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/backport/backport-include/linux/of_net.h b/backport/backport-include/linux/of_net.h
index 7f4b688f..18becf5c 100644
--- a/backport/backport-include/linux/of_net.h
+++ b/backport/backport-include/linux/of_net.h
@@ -12,4 +12,20 @@ static inline const void *of_get_mac_address(struct device_node *np)
#endif
#endif
+/* The behavior of of_get_mac_address() changed in kernel 5.2, it now
+ * returns an error code and not NULL in case of an error.
+ */
+#if LINUX_VERSION_IS_LESS(5,2,0)
+static inline const void *backport_of_get_mac_address(struct device_node *np)
+{
+ const void *mac = of_get_mac_address(np);
+
+ if (!mac)
+ return ERR_PTR(-ENODEV);
+
+ return mac;
+}
+#define of_get_mac_address LINUX_BACKPORT(of_get_mac_address)
+#endif /* < 5.2 */
+
#endif /* _BP_OF_NET_H */
--
2.20.1
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