linux-kernel - Re: [Linaro-mm-sig] [RFC 1/2] dma-buf: Introduce dma buffer sharing mechanism

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Date:	Fri, 25 Nov 2011 16:15:11 +0000
From:	Dave Airlie <airlied@...il.com>
To:	Sumit Semwal <sumit.semwal@...com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mm@...ck.org, linaro-mm-sig@...ts.linaro.org,
	dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org,
	linux@....linux.org.uk, arnd@...db.de, jesse.barker@...aro.org,
	daniel@...ll.ch
Subject: Re: [Linaro-mm-sig] [RFC 1/2] dma-buf: Introduce dma buffer sharing mechanism

> +struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
> +                                               struct device *dev)
> +{
> +       struct dma_buf_attachment *attach;
> +       int ret;
> +
> +       BUG_ON(!dmabuf || !dev);
> +
> +       mutex_lock(&dmabuf->lock);
> +
> +       attach = kzalloc(sizeof(struct dma_buf_attachment), GFP_KERNEL);
> +       if (attach == NULL)
> +               goto err_alloc;
> +
> +       attach->dev = dev;
> +       if (dmabuf->ops->attach) {
> +               ret = dmabuf->ops->attach(dmabuf, dev, attach);
> +               if (!ret)
> +                       goto err_attach;
> +       }
> +       list_add(&attach->node, &dmabuf->attachments);
> +

I would assume at some point this needed at
attach->dmabuf = dmabuf;
added.

Dave.
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