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Diffstat (limited to 'Documentation/driver-api/dmaengine')
| -rw-r--r-- | Documentation/driver-api/dmaengine/provider.rst | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/driver-api/dmaengine/provider.rst b/Documentation/driver-api/dmaengine/provider.rst index 2897ade67b39..be47852e5a0f 100644 --- a/Documentation/driver-api/dmaengine/provider.rst +++ b/Documentation/driver-api/dmaengine/provider.rst @@ -557,6 +557,11 @@ dma_cookie_t - Not really relevant any more since the introduction of ``virt-dma`` that abstracts it away. +- dmaengine drivers need to ensure buffers are flushed before invoking + vchan_cookie_complete() or dma_cookie_complete(). This would imply a call + to unmapping buffers or any such architecture calls to ensure caller seeing + buffers are flushed is done before invoking these calls. + dma_vec - A small structure that contains a DMA address and length. |