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Re: [Xen-devel] [PATCH v3 9/9] xen/gntdev: Implement dma-buf import functionality
- To: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Oleksandr Andrushchenko <andr2000@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, linux-media@xxxxxxxxxxxxxxx, jgross@xxxxxxxx, konrad.wilk@xxxxxxxxxx
- From: Oleksandr Andrushchenko <Oleksandr_Andrushchenko@xxxxxxxx>
- Date: Wed, 13 Jun 2018 12:04:49 +0300
- Authentication-results: spf=none (sender IP is ) smtp.mailfrom=Oleksandr_Andrushchenko@xxxxxxxx;
- Cc: daniel.vetter@xxxxxxxxx, matthew.d.roper@xxxxxxxxx, dongwon.kim@xxxxxxxxx
- Delivery-date: Wed, 13 Jun 2018 09:05:09 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 06/13/2018 06:14 AM, Boris Ostrovsky wrote:
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?
I am rolling back in reverse order here, so I think we first need
to finish local activities with the buffer and then end foreign
access.
-boris
+ dmabuf_imp_free_storage(gntdev_dmabuf);
+ return 0;
}
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