1. dma should be freed when dma2 request fail.
2. dma2 should be freed too when device close.
Signed-off-by: NWang Chen <wangchen@cn.fujitsu.com>
Signed-off-by: NSamuel Ortiz <samuel@sortiz.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>