linux-kernel - [PATCH 1/5] of_net.h: Provide empty functions if OF

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Date:	Tue,  2 Apr 2013 12:35:07 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	"David S. Miller" <davem@...emloft.net>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Grant Likely <grant.likely@...retlab.ca>
Cc:	Rob Herring <rob.herring@...xeda.com>,
	David Daney <david.daney@...ium.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH 1/5] of_net.h: Provide empty functions if OF_NET is not configured

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 empty functions if OF_NET is not configured.
This is safe because all callers do check the return values.

Cc: David Daney <david.daney@...ium.com>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Acked-by: Rob Herring <rob.herring@...xeda.com>
---
 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

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