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virtio: decrement vq->inuse in virtqueue_discard()

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virtqueue_discard() 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.

Cc: qemu-stable@nongnu.org
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2016-08-15 13:54:16 +01:00 committed by Michael S. Tsirkin
parent bccdef6b1a
commit 58a83c6149
1 changed files with 1 additions and 0 deletions
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hw/virtio/virtio.c
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@ -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);
}