virtio-gpu: update old resource too.

When switching scanout from one resource to another we must update the
scanout_bitmask field for both new (set bit) and old (clear bit)
resource.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-id: 20180702162443.16796-3-kraxel@redhat.com

diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index 054ec73..336dc59 100644 (file)
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -590,7 +590,7 @@ static void virtio_unref_resource(pixman_image_t *image, void *data)
 static void virtio_gpu_set_scanout(VirtIOGPU *g,
                                    struct virtio_gpu_ctrl_command *cmd)
 {
-    struct virtio_gpu_simple_resource *res;
+    struct virtio_gpu_simple_resource *res, *ores;
     struct virtio_gpu_scanout *scanout;
     pixman_format_code_t format;
     uint32_t offset;
@@ -664,6 +664,11 @@ static void virtio_gpu_set_scanout(VirtIOGPU *g,
         dpy_gfx_replace_surface(g->scanout[ss.scanout_id].con, scanout->ds);
     }
 
+    ores = virtio_gpu_find_resource(g, scanout->resource_id);
+    if (ores) {
+        ores->scanout_bitmask &= ~(1 << ss.scanout_id);
+    }
+
     res->scanout_bitmask |= (1 << ss.scanout_id);
     scanout->resource_id = ss.resource_id;
     scanout->x = ss.r.x;