> + } else if (object_is_on_stack(urb->transfer_buffer)) { > + WARN_ONCE(1, "transfer buffer is on stack\n"); > + ret = -EAGAIN; > } else { Hi, Has anyone considered a fail-safe mode? I.e.: if a buffer is on stack, kmemdup it and continue with a warning. This will give us both: functional drivers (with possibly decreased efficiency in speed and memory footprint) and warnings for developers that a particular driver requires attention. This mode will not affect drivers which obey the rules, but will make offenders at least functional. My main concern is that not every user is able to detect and report a problem, which prevents drivers from functioning. Especially this is a problem for not wide spread devices. Due to this users a seeing unusable equipment, but developers are not aware of those, even if fixes are trivial. Such mode has a also a negative effect: if a developer has a device with an offending driver, he can miss the warning message, since the driver just works. Regards, Maksim. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html