[PATCH] of_net.h: Provide dummy functions if OF_NET is not configured

[Guenter Roeck <linux@roeck-us.net>]

of_get_mac_address() and of_get_phy_mode() are only provided if OF_NET
is configured. While most callers check for the define, not all do, and those
who do require #ifdef around the code. For those who don't, the missing check
can result in errors such as

arch/powerpc/sysdev/tsi108_dev.c:107:3: error: implicit declaration of
	function 'of_get_mac_address' [-Werror=implicit-function-declaration]
arch/powerpc/sysdev/mv64x60_dev.c:253:2: error: implicit declaration of
	function 'of_get_mac_address' [-Werror=implicit-function-declaration]

Provide dummy function declarations if OF_NET is not configured. This is safe
because all callers do check the return values. If desired, at least some of
the #ifdefs in the code can subsequently be removed.

Cc: David Daney <david.daney@cavium.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
 include/linux/of_net.h |   10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/of_net.h b/include/linux/of_net.h
index f474641..61bf53b 100644
--- a/include/linux/of_net.h
+++ b/include/linux/of_net.h
@@ -11,6 +11,16 @@
 #include <linux/of.h>
 extern const int of_get_phy_mode(struct device_node *np);
 extern const void *of_get_mac_address(struct device_node *np);
+#else
+static inline const int of_get_phy_mode(struct device_node *np)
+{
+	return -ENODEV;
+}
+
+static inline const void *of_get_mac_address(struct device_node *np)
+{
+	return NULL;
+}
 #endif
 
 #endif /* __LINUX_OF_NET_H */
-- 
1.7.9.7