linux-kernel - Re: [PATCH v3 2/2] DMAEngine: Add DMAEngine driver based on old MSM DMA APIs

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Date:	Wed, 14 Mar 2012 17:26:55 +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.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	gregkh@...uxfoundation.org
Subject: Re: [PATCH v3 2/2] DMAEngine: Add DMAEngine driver based on old MSM
 DMA APIs

> [...]
> +
> +struct dma_async_tx_descriptor *msm_dma_prep_interleaved(struct dma_chan *dchan,
> +					struct dma_interleaved_template *xt,
> +					unsigned long flags, void *context)
> +{
> +
> +	struct msm_dma_chan *chan;
> +	struct msm_dma_desc_sw *new;
> +	struct adm_box_cmd_t *box_cmd_vaddr;
> +	u32 *cmd_cntrl = context;
> +
> +	if (!dchan)
> +		return ERR_PTR(-EINVAL);

This is supposed to return either NULL or a valid descriptor.

> +
> +	if (!xt)
> +		return ERR_PTR(-EINVAL);
> [...

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