From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tommi Virtanen <tv@tv.debian.net>
Subject: /sys/class/misc has entry net/tun
Date: Fri, 13 Feb 2004 19:37:27 +0200
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[0 tv@tao /sys/class/misc]$ uname -a
Linux tao 2.6.2-rc2 #6 Mon Jan 26 10:54:50 EET 2004 i686 GNU/Linux
[0 tv@tao /sys/class/misc]$ echo *
intermezzo net/tun psaux rtc uinput
[0 tv@tao /sys/class/misc]$

Seems like that's all because of this:

static struct miscdevice tun_miscdev = {
         .minor = TUN_MINOR,
         .name = "net/tun",
         .fops = &tun_fops
};

Name is apparently meant to be a filename, not a path.
Don't know what should be done to it; maybe

static struct miscdevice tun_miscdev = {
         .minor = TUN_MINOR,
         .name = "tun",
         .fops = &tun_fops,
         .devfs_name = "misc/net/tun",
};

But I havent tried that out.

I'd suggest this, to flush out all the problems. Later,
it can be changed to return -EINVAL or BUG_ON.

--- 1.26/drivers/char/misc.c    Thu Jan 15 13:05:56 2004
+++ edited/misc.c       Fri Feb 13 19:35:45 2004
@@ -212,6 +212,9 @@
  int misc_register(struct miscdevice * misc)
  {
         struct miscdevice *c;
+
+       if (misc->name && strchr(misc->name, '/'))
+         printk("%s: name contains slash when registering %s.\n", 
__func__, misc->name);

         down(&misc_sem);
         list_for_each_entry(c, &misc_list, list) {