From f76f665547f4a954a2c83552a88816fc2a316be0 Mon Sep 17 00:00:00 2001
From: Amit Shah <amit.shah@redhat.com>
Date: Wed, 27 Jul 2011 12:29:33 +0530
Subject: virtio-balloon: Check if balloon registration failed

Multiple balloon registrations are not allowed; check if the
registration with the qemu balloon api succeeded.  If not, fail the
device init.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/virtio-pci.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'hw/virtio-pci.c')

diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
index d685243728..ca5f125dae 100644
--- a/hw/virtio-pci.c
+++ b/hw/virtio-pci.c
@@ -788,6 +788,9 @@ static int virtio_balloon_init_pci(PCIDevice *pci_dev)
     VirtIODevice *vdev;
 
     vdev = virtio_balloon_init(&pci_dev->qdev);
+    if (!vdev) {
+        return -1;
+    }
     virtio_init_pci(proxy, vdev);
     return 0;
 }
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