Thread (2 messages) flat view 2 messages, 2 authors, 2021-10-27

Re: [PATCH] virtio-ring: fix DMA metadata flags

From: Jason Wang <hidden>
Date: 2021-10-27 02:33:02
Also in: lkml

On Tue, Oct 26, 2021 at 9:31 PM Vincent Whitchurch
[off-list ref] 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 <redacted>
Acked-by: Jason Wang <redacted>

Thanks
quoted hunk ↗ jump to hunk
---
 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
_______________________________________________
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization
Keyboard shortcuts
hback out one level
jnext message in thread
kprevious message in thread
ldrill in
Escclose help / fold thread tree
?toggle this help