Re: [PATCH v3 9/9] xen/gntdev: Implement dma-buf import functionality

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On 06/12/2018 09:42 AM, Oleksandr Andrushchenko wrote:

  int gntdev_dmabuf_imp_release(struct gntdev_dmabuf_priv *priv, u32 fd)
  {
-	return -EINVAL;
+	struct gntdev_dmabuf *gntdev_dmabuf;
+	struct dma_buf_attachment *attach;
+	struct dma_buf *dma_buf;
+
+	gntdev_dmabuf = dmabuf_imp_find_unlink(priv, fd);
+	if (IS_ERR(gntdev_dmabuf))
+		return PTR_ERR(gntdev_dmabuf);
+
+	pr_debug("Releasing DMA buffer with fd %d\n", fd);
+
+	attach = gntdev_dmabuf->u.imp.attach;
+
+	if (gntdev_dmabuf->u.imp.sgt)
+		dma_buf_unmap_attachment(attach, gntdev_dmabuf->u.imp.sgt,
+					 DMA_BIDIRECTIONAL);
+	dma_buf = attach->dmabuf;
+	dma_buf_detach(attach->dmabuf, attach);
+	dma_buf_put(dma_buf);
+
+	dmabuf_imp_end_foreign_access(gntdev_dmabuf->u.imp.refs,
+				      gntdev_dmabuf->nr_pages);



Should you first end foreign access, before doing anything?

-boris


+	dmabuf_imp_free_storage(gntdev_dmabuf);
+	return 0;
  }
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