V4L/DVB: buf-dma-sg.c: don't assume nr_pages == sglen
videobuf_pages_to_sg() and videobuf_vmalloc_to_sg() happen to create
a scatterlist element for every page. However, this is not true for
bus addresses, so other functions shouldn't rely on the length of the
scatter list being equal to nr_pages.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/videobuf-dma-sg.c b/drivers/media/video/videobuf-dma-sg.c
index b49f1e2..8359e6b 100644
--- a/drivers/media/video/videobuf-dma-sg.c
+++ b/drivers/media/video/videobuf-dma-sg.c
@@ -286,7 +286,7 @@
if (!dma->sglen)
return 0;
- dma_unmap_sg(q->dev, dma->sglist, dma->nr_pages, dma->direction);
+ dma_unmap_sg(q->dev, dma->sglist, dma->sglen, dma->direction);
vfree(dma->sglist);
dma->sglist = NULL;
@@ -537,7 +537,7 @@
MAGIC_CHECK(mem->dma.magic, MAGIC_DMABUF);
dma_sync_sg_for_cpu(q->dev, mem->dma.sglist,
- mem->dma.nr_pages, mem->dma.direction);
+ mem->dma.sglen, mem->dma.direction);
return 0;
}