When a software timeout occurs, the transfer is not stopped. In DMA case,
it causes DMA channel to be stuck because the transfer is still active
causing following transfers to be queued but not computed.

Cc: <stable@vger.kernel.org> # 3.9+
Signed-off-by: NLudovic Desroches <ludovic.desroches@atmel.com>
Reported-by: NAlexander Morozov <etesial@gmail.com>
Acked-by: NNicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: NChris Ball <cjb@laptop.org>