linux-kernel - Re: [PATCH v6 2/4] dmaengine: tegra: Add tegra gpcdma driver

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Date:   Thu, 23 Sep 2021 13:22:16 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Akhil R <akhilrajeev@...dia.com>
CC:     "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        Krishna Yarlagadda <kyarlagadda@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        Rajesh Gumasta <rgumasta@...dia.com>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        Pavan Kunapuli <pkunapuli@...dia.com>
Subject: Re: [PATCH v6 2/4] dmaengine: tegra: Add tegra gpcdma driver


On 22/09/2021 15:46, Akhil R wrote:
> 
>> On 17/09/2021 15:11, Akhil R wrote:
>>> +static int tegra_dma_slave_config(struct dma_chan *dc,
>>> +				  struct dma_slave_config *sconfig) {
>>> +	struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
>>> +
>>> +	if (tdc->dma_desc) {
>>> +		dev_err(tdc2dev(tdc), "Configuration not allowed\n");
>>> +		return -EBUSY;
>>> +	}
>>> +
>>> +	memcpy(&tdc->dma_sconfig, sconfig, sizeof(*sconfig));
>>> +	if (tdc->slave_id == -1)
>>> +		tdc->slave_id = sconfig->slave_id;
>>> +
>>> +	tdc->config_init = true;
>>> +	return 0;
>>> +}
>>
>> So you have a function to reserve a slave ID, but you don't check here if it is
>> already reserved.
> slave-id is reserved considering the direction as well.
> 'direction' is available only during prep_slave_sg function, I guess.

Sorry I don't understand what you mean by that.

Jon

-- 
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