[RFC-v2 1/6] msix: Work-around for vhost-scsi with KVM in-kernel MSI injection

["Nicholas A. Bellinger" <nab@linux-iscsi.org>]

From: Nicholas Bellinger <nab@linux-iscsi.org>

This is required to get past the following assert with:

commit 1523ed9e1d46b0b54540049d491475ccac7e6421
Author: Jan Kiszka <jan.kiszka@siemens.com>
Date:   Thu May 17 10:32:39 2012 -0300

    virtio/vhost: Add support for KVM in-kernel MSI injection

Cc: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---
 hw/msix.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/hw/msix.c b/hw/msix.c
index 800fc32..c1e6dc3 100644
--- a/hw/msix.c
+++ b/hw/msix.c
@@ -544,6 +544,9 @@ void msix_unset_vector_notifiers(PCIDevice *dev)
 {
     int vector;
 
+    if (!dev->msix_vector_use_notifier && !dev->msix_vector_release_notifier)
+        return;
+
     assert(dev->msix_vector_use_notifier &&
            dev->msix_vector_release_notifier);
 
-- 
1.7.2.5