Hello, This patch series attempt to do the dma-buf unmap as soon as possible, once the driver has finished using the buffer. Instead of waiting until DQBUF to do the unmap. Patch #1 splits vb2_buffer_done() and moves part of its logic to a workqueue to avoid calling the vb2 .finish mem ops. Since doing a buffer sync can take a lot of time so isn't suitable for interrupt context. This was suggested by Hans Verkuil on a previous patch [0]. Patch #2 then moves the dma-buf unmap out of DQBUF to vb2_done_work() now that this is executed in process context since the dmabuf unmap operation can sleep. [0]: https://lkml.org/lkml/2016/8/13/36 Best regards, Javier Javier Martinez Canillas (2): [media] vb2: defer sync buffers from vb2_buffer_done() with a workqueue [media] vb2: move dma-buf unmap from __vb2_dqbuf() to vb2_done_work() drivers/media/v4l2-core/videobuf2-core.c | 114 ++++++++++++++++++++----------- include/media/videobuf2-core.h | 5 ++ 2 files changed, 79 insertions(+), 40 deletions(-) -- 2.5.5 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
