[patch] variable number of dummy devices

[Andi Kleen <ak@xxxxxx>]

Uses the new module_params that nobody else uses now.

diff -u linux-2.6.0test11-amd64/drivers/net/dummy.c-DUMMY 
linux-2.6.0test11-amd64/drivers/net/dummy.c
--- linux-2.6.0test11-amd64/drivers/net/dummy.c-DUMMY   2003-11-29 
16:34:26.000000000 +0100
+++ linux-2.6.0test11-amd64/drivers/net/dummy.c 2003-12-11 09:34:17.000000000 
+0100
@@ -33,6 +33,9 @@
 #include <linux/kernel.h>
 #include <linux/netdevice.h>
 #include <linux/init.h>
+#include <linux/moduleparam.h>
+
+static int numdummies = 1;
 
 static int dummy_xmit(struct sk_buff *skb, struct net_device *dev);
 static struct net_device_stats *dummy_get_stats(struct net_device *dev);
@@ -83,10 +86,14 @@
        return dev->priv;
 }
 
-static struct net_device *dev_dummy;
+static struct net_device **dummies;
 
-static int __init dummy_init_module(void)
+/* Number of dummy devices to be set up by this module. */
+module_param(numdummies, int, 0);
+
+static int __init dummy_init_one(int index)
 {
+       struct net_device *dev_dummy;
        int err;
 
        dev_dummy = alloc_netdev(sizeof(struct net_device_stats),
@@ -98,15 +105,40 @@
        if ((err = register_netdev(dev_dummy))) {
                kfree(dev_dummy);
                dev_dummy = NULL;
+       } else {
+               dummies[index] = dev_dummy; 
        }
+
        return err;
 }
 
+static void __exit dummy_free_one(int index) 
+{
+       unregister_netdev(dummies[index]);
+       free_netdev(dummies[index]);
+} 
+
+static int __init dummy_init_module(void)
+{ 
+       int i, err = 0;
+       dummies = kmalloc(numdummies * sizeof(void *), GFP_KERNEL); 
+       if (!dummies)
+               return -ENOMEM; 
+       for (i = 0; i < numdummies && !err; i++)
+               err = dummy_init_one(i); 
+       if (err) { 
+               while (--i >= 0)
+                       dummy_free_one(i);
+       }
+       return err;
+} 
+
 static void __exit dummy_cleanup_module(void)
 {
-       unregister_netdev(dev_dummy);
-       free_netdev(dev_dummy);
-       dev_dummy = NULL;
+       int i;
+       for (i = 0; i < numdummies; i++) 
+               dummy_free_one(i); 
+       kfree(dummies); 
 }
 
 module_init(dummy_init_module);