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authorFlorian Fainelli <f.fainelli@gmail.com>2015-03-09 14:31:20 -0700
committerDavid S. Miller <davem@davemloft.net>2015-03-09 23:50:20 -0400
commitaa836df958886e57ff0d43fb3d79d1af4aec0cc8 (patch)
tree1b55886cc71a6fd387d42ebc4f08c21a3a6778e9
parent3cef5c5b0b56f3f90b0e9ff8d3f8dc57f464cc14 (diff)
net: core: add of_find_net_device_by_node()
Add a helper function which allows getting the struct net_device pointer associated with a given struct device_node pointer. This is useful for instance for DSA Ethernet devices not backed by a platform_device, but a PCI device. Since we need to access net_class which is not accessible outside of net/core/net-sysfs.c, this helper function is also added here and gated with CONFIG_OF_NET. Network devices initialized with SET_NETDEV_DEV() are also taken into account by checking for dev->parent first and then falling back to checking the device pointer within struct net_device. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/linux/of_net.h8
-rw-r--r--net/core/net-sysfs.c25
2 files changed, 33 insertions, 0 deletions
diff --git a/include/linux/of_net.h b/include/linux/of_net.h
index 34597c8c1a4c..9cd72aab76fe 100644
--- a/include/linux/of_net.h
+++ b/include/linux/of_net.h
@@ -9,8 +9,11 @@
#ifdef CONFIG_OF_NET
#include <linux/of.h>
+
+struct net_device;
extern int of_get_phy_mode(struct device_node *np);
extern const void *of_get_mac_address(struct device_node *np);
+extern struct net_device *of_find_net_device_by_node(struct device_node *np);
#else
static inline int of_get_phy_mode(struct device_node *np)
{
@@ -21,6 +24,11 @@ static inline const void *of_get_mac_address(struct device_node *np)
{
return NULL;
}
+
+static inline struct net_device *of_find_net_device_by_node(struct device_node *np)
+{
+ return NULL;
+}
#endif
#endif /* __LINUX_OF_NET_H */
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index f2aa73bfb0e4..cf30620a88e1 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -23,6 +23,7 @@
#include <linux/export.h>
#include <linux/jiffies.h>
#include <linux/pm_runtime.h>
+#include <linux/of.h>
#include "net-sysfs.h"
@@ -1374,6 +1375,30 @@ static struct class net_class = {
.namespace = net_namespace,
};
+#ifdef CONFIG_OF_NET
+static int of_dev_node_match(struct device *dev, const void *data)
+{
+ int ret = 0;
+
+ if (dev->parent)
+ ret = dev->parent->of_node == data;
+
+ return ret == 0 ? dev->of_node == data : ret;
+}
+
+struct net_device *of_find_net_device_by_node(struct device_node *np)
+{
+ struct device *dev;
+
+ dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
+ if (!dev)
+ return NULL;
+
+ return to_net_dev(dev);
+}
+EXPORT_SYMBOL(of_find_net_device_by_node);
+#endif
+
/* Delete sysfs entries but hold kobject reference until after all
* netdev references are gone.
*/