[PATCH v2] virtio_ring: use shadow flags when detaching split descriptors

[sungbyeongchan]

Fixes: 72b5e8958738 ("virtio-ring: store DMA metadata in desc_extra for split 
virtqueue")
Acked-by: Michael S. Tsirkin <m...@redhat.com>
Assisted-by: LLM
Signed-off-by: sungbyeongchan <tjdqudcks0...@naver.com>
---
Changes in v2:
- Drop the commit message paragraphs as requested by Michael S. Tsirkin.
- Add Michael's Acked-by.

 drivers/virtio/virtio_ring.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index db678f5a80e03..b4cb433df1dec 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -905,7 +905,6 @@ static unsigned detach_buf_split_in_order(struct 
vring_virtqueue *vq,
 {
        struct vring_desc_extra *extra;
        unsigned int i;
-       __virtio16 nextflag = cpu_to_virtio16(vq->vq.vdev, VRING_DESC_F_NEXT);
 
        /* Clear data ptr. */
        vq->split.desc_state[head].data = NULL;
@@ -915,7 +914,7 @@ static unsigned detach_buf_split_in_order(struct 
vring_virtqueue *vq,
        /* Put back on free list: unmap first-level descriptors and find end */
        i = head;
 
-       while (vq->split.vring.desc[i].flags & nextflag) {
+       while (extra[i].flags & VRING_DESC_F_NEXT) {
                i = vring_unmap_one_split(vq, &extra[i]);
                vq->vq.num_free++;
        }
-- 
2.43.0