[PATCH v2 2/2] virtio_ring: packed ring: fix virtqueue_detach_unused_buf

[Pankaj Gupta]

This patch makes packed ring code compatible with split ring in function
'virtqueue_detach_unused_buf_*'.

Signed-off-by: Pankaj Gupta <pagupta@xxxxxxxxxx>
---
 drivers/virtio/virtio_ring.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index c8be1c4f5b55..1b98a6777b7e 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -1534,6 +1534,11 @@ static void *virtqueue_detach_unused_buf_packed(struct virtqueue *_vq)
 	for (i = 0; i < vq->packed.vring.num; i++) {
 		if (!vq->packed.desc_state[i].data)
 			continue;
+		vq->packed.next_avail_idx--;
+		if (vq->packed.next_avail_idx < 0) {
+			vq->packed.next_avail_idx = vq->packed.vring.num - 1;
+			vq->packed.avail_wrap_counter ^= 1;
+		}
 		/* detach_buf clears data, so grab it now. */
 		buf = vq->packed.desc_state[i].data;
 		detach_buf_packed(vq, i, NULL);
-- 
2.21.0