virtio_ring: fix num_free handling in error case

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 <[email protected]>
Cc: Michael S. Tsirkin <[email protected]>
Cc: [email protected]
Signed-off-by: Tiwei Bie <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index eb30f3e09a4775b3f046ccc698f18a05210f17ad..71458f493cf864aa260e493c0ef5ddc4d6c78274 100644 (file)
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -428,8 +428,6 @@ unmap_release:
                i = virtio16_to_cpu(_vq->vdev, vq->vring.desc[i].next);
        }
 
-       vq->vq.num_free += total_sg;
-
        if (indirect)
                kfree(desc);