[Qemu-devel] [PATCH for-2.7 2/4] virtio: decrement vq->inuse in virtqueue_discard()

[Stefan Hajnoczi]

virtqueue_descard() moves vq->last_avail_idx back so the element can be
popped again.  It's necessary to decrement vq->inuse to avoid "leaking"
the element count.

Signed-off-by: Stefan Hajnoczi <address@hidden>
---
 hw/virtio/virtio.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 4df8274..00158b6 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -268,6 +268,7 @@ void virtqueue_discard(VirtQueue *vq, const 
VirtQueueElement *elem,
                        unsigned int len)
 {
     vq->last_avail_idx--;
+    vq->inuse--;
     virtqueue_unmap_sg(vq, elem, len);
 }
 
-- 
2.7.4