uml: sysfs support for uml network driver.

Index: linux-2.6.10-rc3/arch/um/include/net_kern.h
===================================================================
@@ -14,6 +14,7 @@
 struct uml_net {
 	struct list_head list;
 	struct net_device *dev;
+	struct platform_device pdev;
 	int index;
 	unsigned char mac[ETH_ALEN];
 	int have_mac;

Index: linux-2.6.10-rc3/arch/um/drivers/net_kern.c
===================================================================
@@ -30,6 +30,8 @@
 #include "irq_user.h"
 #include "irq_kern.h"
 
+#define DRIVER_NAME "uml-netdev"
+
 static spinlock_t opened_lock = SPIN_LOCK_UNLOCKED;
 LIST_HEAD(opened);
 

@@ -252,7 +254,7 @@ static int uml_net_ioctl(struct net_devi
 {
 	static const struct ethtool_drvinfo info = {
 		.cmd     = ETHTOOL_GDRVINFO,
-		.driver  = "uml virtual ethernet",
+		.driver  = DRIVER_NAME,
 		.version = "42",
 	};
 	void *useraddr;

@@ -289,6 +291,12 @@ void uml_net_user_timer_expire(unsigned 
 static spinlock_t devices_lock = SPIN_LOCK_UNLOCKED;
 static struct list_head devices = LIST_HEAD_INIT(devices);
 
+static struct device_driver uml_net_driver = {
+	.name  = DRIVER_NAME,
+	.bus   = &platform_bus_type,
+};
+static int driver_registered;
+
 static int eth_configure(int n, void *init, char *mac,
 			 struct transport *transport)
 {

@@ -330,6 +338,16 @@ static int eth_configure(int n, void *in
 		return 1;
 	}
 
+	/* sysfs register */
+	if (!driver_registered) {
+		driver_register(&uml_net_driver);
+		driver_registered = 1;
+	}
+	device->pdev.id = n;
+	device->pdev.name = DRIVER_NAME;
+	platform_device_register(&device->pdev);
+	SET_NETDEV_DEV(dev,&device->pdev.dev);
+
 	/* If this name ends up conflicting with an existing registered
 	 * netdevice, that is OK, register_netdev{,ice}() will notice this
 	 * and fail.

@@ -560,6 +578,7 @@ __uml_help(eth_setup,
 "    Configure a network device.\n\n"
 );
 
+#if 0
 static int eth_init(void)
 {
 	struct list_head *ele, *next;

@@ -574,8 +593,8 @@ static int eth_init(void)
 	
 	return(1);
 }
-
 __initcall(eth_init);
+#endif
 
 static int net_config(char *str)
 {

@@ -616,6 +635,7 @@ static int net_remove(char *str)
 	if(lp->fd > 0) return(-1);
 	if(lp->remove != NULL) (*lp->remove)(&lp->user);
 	unregister_netdev(dev);
+	platform_device_unregister(&device->pdev);
 
 	list_del(&device->list);
 	kfree(device);