linux-kernel - Re: [PATCH 5/5] dmaengine: sprd: Add 'device_config' and 'device_prep_slave

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Date:   Tue, 17 Apr 2018 12:45:20 +0200
From:   Lars-Peter Clausen <lars@...afoo.de>
To:     Baolin Wang <baolin.wang@...aro.org>, dan.j.williams@...el.com,
        vinod.koul@...el.com
Cc:     eric.long@...eadtrum.com, broonie@...nel.org,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] dmaengine: sprd: Add 'device_config' and
 'device_prep_slave_sg' interfaces

On 04/10/2018 09:46 AM, Baolin Wang wrote:
[...]
> +static int sprd_dma_slave_config(struct dma_chan *chan,
> +				 struct dma_slave_config *config)
> +{
> +	struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
> +	struct sprd_dma_config *slave_cfg =
> +		container_of(config, struct sprd_dma_config, config);
> +

Please do not overload standard API with custom semantics. This makes the
driver incompatible to the API and negates the whole idea of having a common
API. E.g. this will crash when somebody passes a normal dma_slave_config
struct to this function.

> +	memcpy(&schan->slave_cfg, slave_cfg, sizeof(*slave_cfg));
> +	return 0;
> +}