Index: usb-devel/drivers/media/usb/gspca/gspca.c
===================================================================
--- usb-devel.orig/drivers/media/usb/gspca/gspca.c
+++ usb-devel/drivers/media/usb/gspca/gspca.c
@@ -1599,6 +1599,7 @@ int gspca_dev_probe(struct usb_interface
 	if (dev->descriptor.bNumConfigurations != 1) {
 		pr_err("%04x:%04x too many config\n",
 		       id->idVendor, id->idProduct);
+		dump_stack();
 		return -ENODEV;
 	}