[RFC,3/9] virtio-pci: check that event notification worked

Commit Message

Nicholas A. Bellinger July 24, 2012, 10:34 p.m. UTC

From: Stefan Hajnoczi <[e-mail]>

For sanity assert that event notification succeeds.

Signed-off-by: Stefan Hajnoczi <[e-mail]>
Cc: Anthony Liguori <[e-mail]>
Cc: Paolo Bonzini <[e-mail]>
Signed-off-by: Nicholas Bellinger <[e-mail]>
---
 hw/virtio-pci.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

Patch

diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
index 538eef4..0f0f766 100644
--- a/hw/virtio-pci.c
+++ b/hw/virtio-pci.c
@@ -261,8 +261,11 @@  static void virtio_pci_queue_notify(VirtIOPCIProxy *proxy, uint32_t n)
     vq = virtio_get_queue(proxy->vdev, n);
     notifier = virtio_queue_get_host_notifier(vq);
     if (event_notifier_valid(notifier)) {
+        int r;
+
         printf("notifying vq %u host notifier from userspace\n", n);
-        event_notifier_notify(notifier);
+        r = event_notifier_notify(notifier);
+        assert(r == 0);
     } else {
         virtio_queue_notify_vq(vq);
     }