diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/dmaengine.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 1ee63fdb90a7..1639f8a0a824 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -2060,6 +2060,31 @@ static inline int dmaengine_desc_free(struct dma_async_tx_descriptor *desc) return desc->desc_free(desc); } +/** + * dmaengine_desc_set_callback - set the callback, callback_result and + * parameter on a descriptor + * @tx: the descriptor to set the callback on + * @cb: the plain completion callback, or NULL + * @cb_result: the result-bearing completion callback, or NULL + * @cb_param: the parameter to pass to the callback + * + * Sets the completion callbacks and their shared parameter on a DMA + * transaction descriptor. Use this helper instead of assigning the fields + * directly to ensure all three related fields are updated consistently. + * Only one of @cb and @cb_result should be non-NULL; if both are provided + * @cb_result takes precedence in drivers that support it. + */ +static inline void +dmaengine_desc_set_callback(struct dma_async_tx_descriptor *tx, + dma_async_tx_callback cb, + dma_async_tx_callback_result cb_result, + void *cb_param) +{ + tx->callback = cb; + tx->callback_result = cb_result; + tx->callback_param = cb_param; +} + /* --- DMA device --- */ int dma_async_device_register(struct dma_device *device); |