linux-kernel - Re: [PATCH v4 2/2] DMAEngine: Add DMAEngine driver based on old MSM ADM DMA APIs

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Date:	Thu, 22 Mar 2012 12:49:48 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Ravi Kumar V <kumarrav@...eaurora.org>
CC:	Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	David Brown <davidb@...eaurora.org>,
	Daniel Walker <dwalker@...o99.com>,
	Bryan Huntsman <bryanh@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	linux-arm-msm@...r.kernel.or, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, tsoni@...eaurora.org
Subject: Re: [PATCH v4 2/2] DMAEngine: Add DMAEngine driver based on old MSM
 ADM DMA APIs

On 03/22/2012 11:58 AM, Ravi Kumar V wrote:
> [...]
> +static struct dma_async_tx_descriptor *msm_dma_prep_sg(
> +		struct dma_chan *dchan,
> +		struct scatterlist *dst_sg, unsigned int dst_nents,
> +		struct scatterlist *src_sg, unsigned int src_nents,
> +		unsigned long flags, void *context)
> +{
> [...]
> +
> +	if (!dchan)
> +		return ERR_PTR(-EINVAL);
> +
> +	if (dst_nents == 0 || src_nents == 0)
> +		return ERR_PTR(-EINVAL);
> +	if (!dst_sg || !src_sg)
> +		return ERR_PTR(-EINVAL);
> +
> +	if ((dst_nents != src_nents) || (cmd_config->num_cmd != src_nents))
> +		return ERR_PTR(-EINVAL);
> +
> + [...]
> +
> +	if (!new) {
> +		dev_err(chan->dev,
> +			"No free memory for link descriptor\n");
> +		return ERR_PTR(-ENOMEM);
> +	}
> +
> [...]
> +	return &new->async_tx;
> +}

Same comment as before. This is supposed to return either a valid descriptor
or NULL, but not an ERR_PTR.

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