From: Hans Verkuil <[email protected]> Clarify in the buf_prepare/finish ops what the dma mapping status is of the provided buffer.
Signed-off-by: Hans Verkuil <[email protected]> --- include/media/videobuf2-core.h | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h index a0dedc1..169e111 100644 --- a/include/media/videobuf2-core.h +++ b/include/media/videobuf2-core.h @@ -274,12 +274,14 @@ struct vb2_buffer { * operation in this callback; drivers that support * VIDIOC_CREATE_BUFS must also validate the buffer size; * if an error is returned, the buffer will not be queued - * in driver; optional. + * in driver; any necessary DMA mapping action will have + * been done before this is called; optional. * @buf_finish: called before every dequeue of the buffer back to * userspace; drivers may perform any operations required - * before userspace accesses the buffer; optional. Note: - * this op can be called as well when vb2_is_streaming() - * returns false! + * before userspace accesses the buffer; any necessary DMA + * unmapping action will have been done before this is + * called; optional. Note: this op can be called as well + * when vb2_is_streaming() returns false! * @buf_cleanup: called once before the buffer is freed; drivers may * perform any additional cleanup; optional. * @start_streaming: called once to enter 'streaming' state; the driver may -- 1.9.0 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
