linux-kernel - Re: [PATCH v2 8/9] xen/gntdev: Implement dma-buf import functionality

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Date:   Mon, 4 Jun 2018 18:28:18 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Oleksandr Andrushchenko <andr2000@...il.com>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org,
        jgross@...e.com, konrad.wilk@...cle.com
Cc:     daniel.vetter@...el.com, dongwon.kim@...el.com,
        matthew.d.roper@...el.com,
        Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>
Subject: Re: [PATCH v2 8/9] xen/gntdev: Implement dma-buf import functionality

On 06/01/2018 07:41 AM, Oleksandr Andrushchenko wrote:
>  /* ------------------------------------------------------------------ */
>  
> +static int
> +dmabuf_imp_grant_foreign_access(struct page **pages, u32 *refs,
> +				int count, int domid)
> +{
> +	grant_ref_t priv_gref_head;
> +	int i, ret;
> +
> +	ret = gnttab_alloc_grant_references(count, &priv_gref_head);
> +	if (ret < 0) {
> +		pr_err("Cannot allocate grant references, ret %d\n", ret);
> +		return ret;
> +	}
> +
> +	for (i = 0; i < count; i++) {
> +		int cur_ref;
> +
> +		cur_ref = gnttab_claim_grant_reference(&priv_gref_head);
> +		if (cur_ref < 0) {
> +			ret = cur_ref;
> +			pr_err("Cannot claim grant reference, ret %d\n", ret);
> +			goto out;
> +		}
> +
> +		gnttab_grant_foreign_access_ref(cur_ref, domid,
> +						xen_page_to_gfn(pages[i]), 0);
> +		refs[i] = cur_ref;
> +	}
> +
> +	ret = 0;

return 0?

> +
> +out:
> +	gnttab_free_grant_references(priv_gref_head);
> +	return ret;
> +}
> +