[Qemu-devel] [PATCH 5/9] virtio: Use DO_UPCAST instead of a cast

[Juan Quintela]

virtio_common_init() creates a struct with the right size, DO_UPCAST
is the appropiate thing here

Signed-off-by: Juan Quintela <quint...@redhat.com>
---
 hw/virtio-balloon.c |    4 ++--
 hw/virtio-blk.c     |    7 ++++---
 hw/virtio-net.c     |    8 ++++----
 3 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/hw/virtio-balloon.c b/hw/virtio-balloon.c
index 71d009f..ca7f969 100644
--- a/hw/virtio-balloon.c
+++ b/hw/virtio-balloon.c
@@ -284,11 +284,11 @@ static int virtio_balloon_load(QEMUFile *f, void *opaque, 
int version_id)
 VirtIODevice *virtio_balloon_init(DeviceState *dev)
 {
     VirtIOBalloon *s;
-
-    s = (VirtIOBalloon *)virtio_common_init("virtio-balloon",
+    VirtIODevice *vdev = virtio_common_init("virtio-balloon",
                                             VIRTIO_ID_BALLOON,
                                             8, sizeof(VirtIOBalloon));

+    s = DO_UPCAST(VirtIOBalloon, vdev, vdev);
     s->vdev.get_config = virtio_balloon_get_config;
     s->vdev.set_config = virtio_balloon_set_config;
     s->vdev.get_features = virtio_balloon_get_features;
diff --git a/hw/virtio-blk.c b/hw/virtio-blk.c
index ce8b604..672a07b 100644
--- a/hw/virtio-blk.c
+++ b/hw/virtio-blk.c
@@ -464,9 +464,10 @@ VirtIODevice *virtio_blk_init(DeviceState *dev, BlockConf 
*conf)
     int cylinders, heads, secs;
     static int virtio_blk_id;

-    s = (VirtIOBlock *)virtio_common_init("virtio-blk", VIRTIO_ID_BLOCK,
-                                          sizeof(struct virtio_blk_config),
-                                          sizeof(VirtIOBlock));
+    VirtIODevice *vdev = virtio_common_init("virtio-blk", VIRTIO_ID_BLOCK,
+                                            sizeof(struct virtio_blk_config),
+                                            sizeof(VirtIOBlock));
+    s = DO_UPCAST(VirtIOBlock, vdev, vdev);

     s->vdev.get_config = virtio_blk_update_config;
     s->vdev.get_features = virtio_blk_get_features;
diff --git a/hw/virtio-net.c b/hw/virtio-net.c
index c0537c8..2761a1a 100644
--- a/hw/virtio-net.c
+++ b/hw/virtio-net.c
@@ -829,11 +829,11 @@ VirtIODevice *virtio_net_init(DeviceState *dev, NICConf 
*conf)
 {
     VirtIONet *n;
     static int virtio_net_id;
+    VirtIODevice *vdev = virtio_common_init("virtio-net", VIRTIO_ID_NET,
+                                            sizeof(struct virtio_net_config),
+                                            sizeof(VirtIONet));

-    n = (VirtIONet *)virtio_common_init("virtio-net", VIRTIO_ID_NET,
-                                        sizeof(struct virtio_net_config),
-                                        sizeof(VirtIONet));
-
+    n = DO_UPCAST(VirtIONet, vdev, vdev);
     n->vdev.get_config = virtio_net_get_config;
     n->vdev.set_config = virtio_net_set_config;
     n->vdev.get_features = virtio_net_get_features;
-- 
1.6.6.1