diff options
Diffstat (limited to 'drivers/dma/dmaengine.h')
| -rw-r--r-- | drivers/dma/dmaengine.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/dma/dmaengine.h b/drivers/dma/dmaengine.h index 7692c8644045..47e099772b8e 100644 --- a/drivers/dma/dmaengine.h +++ b/drivers/dma/dmaengine.h @@ -5,6 +5,7 @@ #ifndef DMAENGINE_H #define DMAENGINE_H +#include <linux/bug.h> #include <linux/dmaengine.h> /** @@ -27,4 +28,21 @@ static inline dma_cookie_t dma_cookie_assign(struct dma_async_tx_descriptor *tx) return cookie; } +/** + * dma_cookie_complete - complete a descriptor + * @tx: descriptor to complete + * + * Mark this descriptor complete by updating the channels completed + * cookie marker. Zero the descriptors cookie to prevent accidental + * repeated completions. + * + * Note: caller is expected to hold a lock to prevent concurrency. + */ +static inline void dma_cookie_complete(struct dma_async_tx_descriptor *tx) +{ + BUG_ON(tx->cookie < DMA_MIN_COOKIE); + tx->chan->completed_cookie = tx->cookie; + tx->cookie = 0; +} + #endif |