If you compile the kernel with SMP and spinlock debugging, BUG() will be 
called when registering your atm driver, since the "atm_dev_lock" spinlock is 
not locked when unlocking it.

kernel 2.4.18

Regards,
Frode

--- linux/net/atm/resources.c.orig	Fri Mar  1 18:34:02 2002
+++ linux/net/atm/resources.c	Fri Mar  1 18:34:17 2002
@@ -110,12 +110,10 @@
 		if (atm_proc_dev_register(dev) < 0) {
 			printk(KERN_ERR "atm_dev_register: "
 			    "atm_proc_dev_register failed for dev %s\n",type);
-			spin_unlock (&atm_dev_lock);		
 			free_atm_dev(dev);
 			return NULL;
 		}
 #endif
-	spin_unlock (&atm_dev_lock);		
 	return dev;
 }

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