| /* |
| * 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. |
| */ |
| static inline dma_cookie_t dma_cookie_assign(struct dma_async_tx_descriptor *tx) |
| { |
| struct dma_chan *chan = tx->chan; |
| dma_cookie_t cookie; |
| |
| cookie = chan->cookie + 1; |
| if (cookie < DMA_MIN_COOKIE) |
| cookie = DMA_MIN_COOKIE; |
| tx->cookie = chan->cookie = cookie; |
| |
| return cookie; |
| } |
| |
| #endif |