drm/virtio: add case for shmem objects in virtio_gpu_cleanup_object(..)

This function can be reused for hostmem objects.

v2: move virtio_gpu_is_shmem() check to virtio_gpu_cleanup_object()
v3: use-after free fix
Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20200305013212.130640-2-gurchetansingh@chromium.orgSigned-off-by: Gerd Hoffmann <kraxel@redhat.com>

drivers/gpu/drm/virtio/virtgpu_drv.h

@@ -371,7 +371,7 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
 			     struct virtio_gpu_object **bo_ptr,
 			     struct virtio_gpu_fence *fence);
 
-bool virtio_gpu_is_shmem(struct drm_gem_object *obj);
+bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo);
 
 /* virtgpu_prime.c */
 struct drm_gem_object *virtgpu_gem_prime_import_sg_table(

drivers/gpu/drm/virtio/virtgpu_object.c

@@ -65,6 +65,9 @@ static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t
 void virtio_gpu_cleanup_object(struct virtio_gpu_object *bo)
 {
 	struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
+
+	virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
+	if (virtio_gpu_is_shmem(bo)) {
 		struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
 
 		if (shmem->pages) {
@@ -74,12 +77,14 @@ void virtio_gpu_cleanup_object(struct virtio_gpu_object *bo)
 					     DMA_TO_DEVICE);
 				shmem->mapped = 0;
 			}
+
 			sg_free_table(shmem->pages);
 			shmem->pages = NULL;
 			drm_gem_shmem_unpin(&bo->base.base);
 		}
-	virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
+
 		drm_gem_shmem_free_object(&bo->base.base);
+	}
 }
 
 static void virtio_gpu_free_object(struct drm_gem_object *obj)
@@ -110,9 +115,9 @@ static const struct drm_gem_object_funcs virtio_gpu_shmem_funcs = {
 	.mmap = drm_gem_shmem_mmap,
 };
 
-bool virtio_gpu_is_shmem(struct drm_gem_object *obj)
+bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo)
 {
-	return obj->funcs == &virtio_gpu_shmem_funcs;
+	return bo->base.base.funcs == &virtio_gpu_shmem_funcs;
 }
 
 struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,