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Commit aa836df9 authored by Florian Fainelli's avatar Florian Fainelli Committed by David S. Miller
Browse files

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: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 3cef5c5b

include/linux/of_net.h

+8 −0
Original line number Diff line number Diff line
@@ -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 */

net/core/net-sysfs.c

+25 −0
Original line number Diff line number Diff line
@@ -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.

 */