The clearing of the private data members in the (*detatch) is not necessary. The comedi core is going to kfree the private data as soon as the (*detach) finishes. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Reviewed-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>