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

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Date:   Fri, 20 Dec 2019 10:48:00 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     Vinod Koul <vkoul@...nel.org>
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 Vinod,

On 20/12/2019 10.32, Vinod Koul wrote:
> 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 :)

desc_check_and_set_metadata_mode() does the checking to make sure that
the modes are not mixed.

- Péter

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