[PATCH] drm/shmem-helpers: Simplify dma-buf importing

[Boris Brezillon]

On Wed, 20 May 2020 20:02:32 +0200
Daniel Vetter <daniel.vetter at ffwll.ch> wrote:
 
> @@ -695,36 +702,16 @@ drm_gem_shmem_prime_import_sg_table(struct drm_device *dev,
>  				    struct sg_table *sgt)
>  {
>  	size_t size = PAGE_ALIGN(attach->dmabuf->size);
> -	size_t npages = size >> PAGE_SHIFT;
>  	struct drm_gem_shmem_object *shmem;
> -	int ret;
>  
>  	shmem = drm_gem_shmem_create(dev, size);
>  	if (IS_ERR(shmem))
>  		return ERR_CAST(shmem);
>  
> -	shmem->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
> -	if (!shmem->pages) {
> -		ret = -ENOMEM;
> -		goto err_free_gem;
> -	}
> -
> -	ret = drm_prime_sg_to_page_addr_arrays(sgt, shmem->pages, NULL, npages);
> -	if (ret < 0)
> -		goto err_free_array;
> -
>  	shmem->sgt = sgt;
> -	shmem->pages_use_count = 1; /* Permanently pinned from our point of view */

Keep the above line and that should be good.

>  
>  	DRM_DEBUG_PRIME("size = %zu\n", size);
>  
>  	return &shmem->base;
> -
> -err_free_array:
> -	kvfree(shmem->pages);
> -err_free_gem:
> -	drm_gem_object_put(&shmem->base);
> -
> -	return ERR_PTR(ret);
>  }
>  EXPORT_SYMBOL_GPL(drm_gem_shmem_prime_import_sg_table);