linux-kernel - Re: [PATCH v7 04/12] dmaengine: Add metadata_ops for dma_async_tx

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Message-ID: <20191220083216.GK2536@vkoul-mobl>
Date:   Fri, 20 Dec 2019 14:02:16 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Peter Ujfalusi <peter.ujfalusi@...com>
Cc:     robh+dt@...nel.org, nm@...com, ssantosh@...nel.org,
        dan.j.williams@...el.com, dmaengine@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, grygorii.strashko@...com,
        lokeshvutla@...com, t-kristo@...com, tony@...mide.com,
        j-keerthy@...com, vigneshr@...com
Subject: Re: [PATCH v7 04/12] dmaengine: Add metadata_ops for
 dma_async_tx_descriptor

Hi Peter,

On 09-12-19, 11:43, Peter Ujfalusi wrote:

> +int dmaengine_desc_attach_metadata(struct dma_async_tx_descriptor *desc,
> +				   void *data, size_t len)
> +{
> +	int ret;
> +
> +	if (!desc)
> +		return -EINVAL;
> +
> +	ret = desc_check_and_set_metadata_mode(desc, DESC_METADATA_CLIENT);
> +	if (ret)
> +		return ret;
> +
> +	if (!desc->metadata_ops || !desc->metadata_ops->attach)
> +		return -ENOTSUPP;
> +
> +	return desc->metadata_ops->attach(desc, data, len);

this looks good to me, only thing is we should check if people are
mixing the modes :)

-- 
~Vinod