drm/virtio: only destroy created contexts

This can happen if userspace doesn't issue any 3D ioctls before
closing the DRM fd.

Fixes: 72b48ae800da ("drm/virtio: enqueue virtio_gpu_create_context after the first 3D ioctl")
Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20200408232938.55816-1-gurchetansingh@chromium.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c
index 023a030..a503829 100644 (file)
--- a/drivers/gpu/drm/virtio/virtgpu_kms.c
+++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
@@ -52,14 +52,6 @@ static void virtio_gpu_config_changed_work_func(struct work_struct *work)
                      events_clear, &events_clear);
 }
 
-static void virtio_gpu_context_destroy(struct virtio_gpu_device *vgdev,
-                                     uint32_t ctx_id)
-{
-       virtio_gpu_cmd_context_destroy(vgdev, ctx_id);
-       virtio_gpu_notify(vgdev);
-       ida_free(&vgdev->ctx_id_ida, ctx_id - 1);
-}
-
 static void virtio_gpu_init_vq(struct virtio_gpu_queue *vgvq,
                               void (*work_func)(struct work_struct *work))
 {
@@ -274,14 +266,17 @@ int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
 void virtio_gpu_driver_postclose(struct drm_device *dev, struct drm_file *file)
 {
        struct virtio_gpu_device *vgdev = dev->dev_private;
-       struct virtio_gpu_fpriv *vfpriv;
+       struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
 
        if (!vgdev->has_virgl_3d)
                return;
 
-       vfpriv = file->driver_priv;
+       if (vfpriv->context_created) {
+               virtio_gpu_cmd_context_destroy(vgdev, vfpriv->ctx_id);
+               virtio_gpu_notify(vgdev);
+       }
 
-       virtio_gpu_context_destroy(vgdev, vfpriv->ctx_id);
+       ida_free(&vgdev->ctx_id_ida, vfpriv->ctx_id - 1);
        mutex_destroy(&vfpriv->context_lock);
        kfree(vfpriv);
        file->driver_priv = NULL;