linux-kernel - Re: [PATCH v2 1/2] dmaengine: Clarify device parameter for dma_sync_*_for

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Date:	Fri, 25 Jul 2014 14:21:48 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Geert Uytterhoeven <geert+renesas@...der.be>
Cc:	Mark Brown <broonie@...nel.org>,
	Dan Williams <dan.j.williams@...el.com>,
	dmaengine@...r.kernel.org, linux-spi@...r.kernel.org,
	linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dmaengine: Clarify device parameter for
 dma_sync_*_for_*()

On Fri, Jul 11, 2014 at 05:56:21PM +0200, Geert Uytterhoeven wrote:
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
> v2:
>   - New
> ---
>  Documentation/dmaengine.txt | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/dmaengine.txt b/Documentation/dmaengine.txt
> index 879b6e31e2da..87d3f192e160 100644
> --- a/Documentation/dmaengine.txt
> +++ b/Documentation/dmaengine.txt
> @@ -100,8 +100,10 @@ The slave DMA usage consists of following steps:
>     The peripheral driver is expected to have mapped the scatterlist for
>     the DMA operation prior to calling device_prep_slave_sg, and must
>     keep the scatterlist mapped until the DMA operation has completed.
> -   The scatterlist must be mapped using the DMA struct device.  So,
> -   normal setup should look like this:
> +   The scatterlist must be mapped using the DMA struct device.
> +   If a mapping needs to be synchronized later, dma_sync_*_for_*() must be
> +   called using the DMA struct device, too.
> +   So, normal setup should look like this:
>  
>  	nr_sg = dma_map_sg(chan->device->dev, sgl, sg_len);
>  	if (nr_sg == 0)
> -- 
> 1.9.1
> 
Applied, thanks

-- 
~Vinod
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