Most recent kernel where this bug did not occur: 2.6.22
Distribution: Debian testing
Hardware Environment: DELL XPS1330
Software Environment: Console
Problem Description:

this patch works as necessary workaround to support conexant RD02-D400 , which
fails to get assigned normally :

drivers/usb/class/cdc-acm.c: Zero length descriptor references
cdc_acm: probe of 1-1.2:1.0 failed with error -22

--- cdc-acm.c.orig      2007-10-15 13:54:51.000000000 -0400
+++ cdc-acm.c   2007-10-15 13:58:05.000000000 -0400
@@ -1165,6 +1165,9 @@
        { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
        .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
        },
+       { USB_DEVICE(0x0572, 0x1324), /* Conexant RD02-D400 */
+       .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
+       },
        { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
        .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
        },