/* * The contents of this file are private to DMA engine drivers, and is not * part of the API to be used by DMA engine users. */#ifndef DMAENGINE_H#define DMAENGINE_H#include <linux/dmaengine.h>
/** * dma_cookie_assign - assign a DMA engine cookie to the descriptor * @tx: descriptor needing cookie * * Assign a unique non-zero per-channel cookie to the descriptor. * Note: caller is expected to hold a lock to prevent concurrency. */staticinlinedma_cookie_tdma_cookie_assign(structdma_async_tx_descriptor*tx){structdma_chan*chan=tx->chan;dma_cookie_tcookie;cookie=chan->cookie+1;if(cookie<DMA_MIN_COOKIE)cookie=DMA_MIN_COOKIE;tx->cookie=chan->cookie=cookie;returncookie;}