[PATCH] virtio_ring: fix num_free handling in error case

[Tiwei Bie]

The vq->vq.num_free hasn't been changed when error happens,
so it shouldn't be changed when handling the error.

Fixes: 780bc7903a32 ("virtio_ring: Support DMA APIs")
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Tiwei Bie <tiwei.bie@xxxxxxxxx>
---
 drivers/virtio/virtio_ring.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index eb30f3e09a47..71458f493cf8 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -428,8 +428,6 @@ static inline int virtqueue_add(struct virtqueue *_vq,
 		i = virtio16_to_cpu(_vq->vdev, vq->vring.desc[i].next);
 	}
 
-	vq->vq.num_free += total_sg;
-
 	if (indirect)
 		kfree(desc);
 
-- 
2.11.0