virtio-blk: fix disabled mode

We must not call virtio_blk_data_plane_notify if dataplane is
disabled: we would hit a segmentation fault in notify_guest_bh as
s->guest_notifier has not been setup and is NULL.

Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
index 870d345244..151fe788db 100644
--- a/hw/block/virtio-blk.c
+++ b/hw/block/virtio-blk.c
@@ -54,7 +54,7 @@ static void virtio_blk_req_complete(VirtIOBlockReq *req, unsigned char status)
 
     stb_p(&req->in->status, status);
     virtqueue_push(s->vq, &req->elem, req->in_len);
-    if (s->dataplane) {
+    if (s->dataplane_started && !s->dataplane_disabled) {
         virtio_blk_data_plane_notify(s->dataplane);
     } else {
         virtio_notify(vdev, s->vq);