Can not remove a module which has no cleanup_module()

["Smith Norton" <smith.norton@xxxxxxxxx>]

I have created a small linux kernel module in Ubuntu 6.06 which has
'init_module()' but no 'cleanup_module()'.


/* Begin start.c */
#include <linux/kernel.h>
#include <linux/module.h>

int init_module(void)
{
       printk(KERN_INFO "starting module ...\n");
       return 0;
}
/* End start.c */

I loaded this module using the command 'sudo insmod start.ko'. But
when I try to remove 'start' from the kernel, I get this error
message.

$ sudo insmod start.ko
$ sudo rmmod start.ko
ERROR: Removing 'start': Device or resource busy

What's the concept behind this? Please explain.

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