From: Hans Verkuil <hans.verk...@cisco.com>
The driver might touch the data after mapping in buf_prepare, so make sure it
is synced for cpu.
Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
---
drivers/media/v4l2-core/videobuf2-dma-contig.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/media/v4l2-core/videobuf2-dma-contig.c
b/drivers/media/v4l2-core/videobuf2-dma-contig.c
index 4a02ade..dd39651 100644
--- a/drivers/media/v4l2-core/videobuf2-dma-contig.c
+++ b/drivers/media/v4l2-core/videobuf2-dma-contig.c
@@ -666,6 +666,12 @@ static void *vb2_dc_get_userptr(void *alloc_ctx, unsigned
long vaddr,
goto fail_map_sg;
}
+ /*
+ * After mapping the buffer we have to sync it for cpu since the
+ * buf_prepare() callback might need to access/modify the buffer.
+ */
+ dma_sync_sg_for_cpu(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir);
+
buf->dma_addr = sg_dma_address(sgt->sgl);
buf->size = size;
buf->dma_sgt = sgt;
--
2.1.1
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