--- drivers/usb/class/cdc-acm.c.orig	2004-04-15 20:04:47.051145144 +0200
+++ drivers/usb/class/cdc-acm.c	2004-04-15 20:05:52.419207688 +0200
@@ -585,7 +585,8 @@
 
 		for (j = 0; j < cfacm->desc.bNumInterfaces - 1; j++) {
 		    
-			if (usb_interface_claimed(cfacm->interface[j]) ||
+			if ((usb_interface_claimed(cfacm->interface[j]) 
+				&& usb_get_intfdata(cfacm->interface[j]) != NULL ) ||
 			    usb_interface_claimed(cfacm->interface[j + 1]))
 				continue;