This properly unmaps DMA SG on device shutdown.
Reported-by: NNandor Han <nandor.han@ge.com>
Suggested-by: NNandor Han <nandor.han@ge.com>
Signed-off-by: NSebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>