failover: really display a warning when the primary device is not found

In failover_add_primary(), we search the id of the failover device by
scanning the list of the devices in the opts list to find a device with
a failover_pair_id equals to the id of the virtio-net device.

If the failover_pair_id is not found, QEMU ignores the primary
device silently (which also means it will not be hidden and
it will be enabled directly at boot).

After that, we search the id in the opts list to do a qdev_device_add()
with it. The device will be always found as otherwise we had exited
before, and thus the warning is never displayed.

Fix that by moving the error report to the first exit condition.
Also add a g_assert() to be sure the compiler will not complain
about a possibly NULL pointer.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Message-Id: <20210212135250.2738750-4-lvivier@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 9 insertions, 11 deletions

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 1c5af08dc5..439f823b19 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -855,21 +855,19 @@ static void failover_add_primary(VirtIONet *n, Error **errp)
 
     id = failover_find_primary_device_id(n);
     if (!id) {
+        error_setg(errp, "Primary device not found");
+        error_append_hint(errp, "Virtio-net failover will not work. Make "
+                          "sure primary device has parameter"
+                          " failover_pair_id=%s\n", n->netclient_name);
         return;
     }
     opts = qemu_opts_find(qemu_find_opts("device"), id);
-    if (opts) {
-        dev = qdev_device_add(opts, &err);
-        if (err) {
-            qemu_opts_del(opts);
-        } else {
-            object_unref(OBJECT(dev));
-        }
+    g_assert(opts); /* cannot be NULL because id was found using opts list */
+    dev = qdev_device_add(opts, &err);
+    if (err) {
+        qemu_opts_del(opts);
     } else {
-        error_setg(errp, "Primary device not found");
-        error_append_hint(errp, "Virtio-net failover will not work. Make "
-                          "sure primary device has parameter"
-                          " failover_pair_id=<virtio-net-id>\n");
+        object_unref(OBJECT(dev));
     }
     error_propagate(errp, err);
 }