linux-kernel - Re: [PATCH 4/4] ste_dma40: implement support for scatterlist to scatterlist copy

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Message-ID: <4CA438B4.4040106@stericsson.com>
Date:	Thu, 30 Sep 2010 09:13:56 +0200
From:	Per Friden <per.friden@...ricsson.com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	"Ira W. Snyder" <iws@...o.caltech.edu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	Linus Walleij <linus.ml.walleij@...il.com>,
	Per FORLIN <per.forlin@...ricsson.com>
Subject: Re: [PATCH 4/4] ste_dma40: implement support for scatterlist to scatterlist
 copy

On 09/29/2010 11:19 PM, Dan Williams wrote:
> On Mon, Sep 27, 2010 at 3:57 PM, Ira W. Snyder <iws@...o.caltech.edu> wrote:
>> Now that the DMAEngine API has support for scatterlist to scatterlist
>> copy, implement support for the STE DMA40 DMA controller.
>>
>> Cc: Linus Walleij <linus.ml.walleij@...il.com>
>> Cc: Per Fridén <per.friden@...ricsson.com>
>> Signed-off-by: Ira W. Snyder <iws@...o.caltech.edu>
>> ---
>>  drivers/dma/ste_dma40.c |   17 +++++++++++++++++
>>  1 files changed, 17 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
>> index 17e2600..cd48859 100644
>> --- a/drivers/dma/ste_dma40.c
>> +++ b/drivers/dma/ste_dma40.c
>> @@ -1857,6 +1857,18 @@ err:
>>        return NULL;
>>  }
>>
>> +static struct dma_async_tx_descriptor *
>> +d40_prep_sg(struct dma_chan *chan,
>> +           struct scatterlist *dst_sg, unsigned int dst_nents,
>> +           struct scatterlist *src_sg, unsigned int src_nents,
>> +           unsigned long dma_flags)
>> +{
>> +       if (dst_nents != src_nents)
>> +               return -EINVAL;
> 
> I suspect you wanted "return NULL;" here.  I can fix that up.
> 
> Linus, Per ack?
> 
> --
> Dan
Thanks Dan. Acked by Per.

/Per
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