On Tue, Oct 26, 2021 at 9:31 PM Vincent Whitchurch
<vincent.whitchurch@xxxxxxxx> wrote:
>
> The flags are currently overwritten, leading to the wrong direction
> being passed to the DMA unmap functions.
>
> Fixes: 72b5e8958738aaa4 ("virtio-ring: store DMA metadata in desc_extra for split virtqueue")
> Signed-off-by: Vincent Whitchurch <vincent.whitchurch@xxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
Thanks
> ---
> drivers/virtio/virtio_ring.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> index dd95dfd85e98..3035bb6f5458 100644
> --- a/drivers/virtio/virtio_ring.c
> +++ b/drivers/virtio/virtio_ring.c
> @@ -576,7 +576,7 @@ static inline int virtqueue_add_split(struct virtqueue *_vq,
> /* Last one doesn't continue. */
> desc[prev].flags &= cpu_to_virtio16(_vq->vdev, ~VRING_DESC_F_NEXT);
> if (!indirect && vq->use_dma_api)
> - vq->split.desc_extra[prev & (vq->split.vring.num - 1)].flags =
> + vq->split.desc_extra[prev & (vq->split.vring.num - 1)].flags &=
> ~VRING_DESC_F_NEXT;
>
> if (indirect) {
> --
> 2.28.0
>
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