netdev - [PATCH] netdev/phy: skip disabled mdio-mux nodes

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Date:	Tue, 7 Aug 2012 11:51:06 -0500
From:	Timur Tabi <timur@...escale.com>
To:	<david.daney@...ium.com>, David Miller <davem@...emloft.net>,
	<netdev@...r.kernel.org>
Subject: [PATCH] netdev/phy: skip disabled mdio-mux nodes

The mdio-mux driver scans all child mdio nodes, without regard to whether
the node is actually used.  Some device trees include all possible
mdio-mux nodes and rely on the boot loader to disable those that are not
present, based on some run-time configuration.  Those nodes need to be
skipped.

Signed-off-by: Timur Tabi <timur@...escale.com>
---
 drivers/net/phy/mdio-mux.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/drivers/net/phy/mdio-mux.c b/drivers/net/phy/mdio-mux.c
index 5c12018..d0c231e 100644
--- a/drivers/net/phy/mdio-mux.c
+++ b/drivers/net/phy/mdio-mux.c
@@ -135,6 +135,15 @@ int mdio_mux_init(struct device *dev,
 	for_each_child_of_node(dev->of_node, child_bus_node) {
 		u32 v;
 
+		/*
+		 * Some device trees include all possible mdio-mux nodes and
+		 * rely on the boot loader to disable those that are not
+		 * present, based on some run-time configuration.  Those nodes
+		 * need to be skipped.
+		 */
+		if (!of_device_is_available(child_bus_node))
+			continue;
+
 		r = of_property_read_u32(child_bus_node, "reg", &v);
 		if (r)
 			continue;
-- 
1.7.3.4


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