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[PULL,v2,07/14] virtio-balloon: discard virtqueue element on reset

Message ID 1473456998-14863-8-git-send-email-mst@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Michael S. Tsirkin Sept. 9, 2016, 9:47 p.m. UTC 
From: Ladi Prosek <lprosek@redhat.com>

The one pending element is being freed but not discarded on device
reset, which causes svq->inuse to creep up, eventually hitting the
"Virtqueue size exceeded" error.

Properly discarding the element on device reset makes sure that its
buffers are unmapped and the inuse counter stays balanced.

Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Roman Kagan <rkagan@virtuozzo.com>
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/virtio/virtio-balloon.c | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/hw/virtio/virtio-balloon.c b/hw/virtio/virtio-balloon.c
index 5af429a..ad4189a 100644
--- a/hw/virtio/virtio-balloon.c
+++ b/hw/virtio/virtio-balloon.c
@@ -463,6 +463,7 @@  static void virtio_balloon_device_reset(VirtIODevice *vdev)
     VirtIOBalloon *s = VIRTIO_BALLOON(vdev);
 
     if (s->stats_vq_elem != NULL) {
+        virtqueue_discard(s->svq, s->stats_vq_elem, 0);
         g_free(s->stats_vq_elem);
         s->stats_vq_elem = NULL;
     }