From: Lucas Stach <l.stach@xxxxxxxxxxxxxx> The kernel driver never touches the decoded buffers with the CPU. All accesses are either done by hardware DMA masters or userspace mapping the buffers. This means we don't need a kernel virtual address mapping for those buffers at all. As those buffers are usually quite large, we can save a good deal of kernel vmalloc space by requesting to not have a kernel mapping set up for them. Signed-off-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx> Signed-off-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx> --- drivers/media/platform/coda/coda-common.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/media/platform/coda/coda-common.c b/drivers/media/platform/coda/coda-common.c index 834f11fe9dc2..287dc1692286 100644 --- a/drivers/media/platform/coda/coda-common.c +++ b/drivers/media/platform/coda/coda-common.c @@ -2387,6 +2387,7 @@ int coda_decoder_queue_init(void *priv, struct vb2_queue *src_vq, dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; dst_vq->io_modes = VB2_DMABUF | VB2_MMAP; + dst_vq->dma_attrs = DMA_ATTR_NO_KERNEL_MAPPING; dst_vq->mem_ops = &vb2_dma_contig_memops; return coda_queue_init(priv, dst_vq); -- 2.20.1
