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how can I allocate a DMA channel by using new dmaengine API in Linx kernel?

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linux-howto

http://askubuntu.com – I need help. Any one knows why I am getting the message “dmaengine: __dma_request_channel: fail ((null))” when calling the function "dma_request_channel(mask, dma->fn, dma->rx_param)" to “allocate DMA channel” in Linux 2.6+. (HowTos)