dw_dma_filter
return dw_dma_filter(chan, &slave);
if (chan->private && !dw_dma_filter(chan, chan->private)) {
EXPORT_SYMBOL_GPL(dw_dma_filter);
extern bool dw_dma_filter(struct dma_chan *chan, void *param);
return dma_request_channel(cap, dw_dma_filter, &slave);