linux-kernel - Re: [PATCH v2 10/14] dma: edma: Simplify direction configuration in edma_config

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Date:	Fri, 11 Apr 2014 09:39:10 +0300
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	Joel Fernandes <joelf@...com>, <dan.j.williams@...el.com>,
	<vinod.koul@...el.com>, <nsekhar@...com>
CC:	<dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-omap@...r.kernel.org>,
	<davinci-linux-open-source@...ux.davincidsp.com>,
	<mporter@...aro.org>
Subject: Re: [PATCH v2 10/14] dma: edma: Simplify direction configuration
 in edma_config_pset()

On 04/11/2014 01:40 AM, Joel Fernandes wrote:
> On 04/01/2014 08:06 AM, Peter Ujfalusi wrote:
>> We only support DEV_TO_MEM or MEM_TO_DEV directions with edma driver and the
>> check for the direction has been already done in the function calling
>> edma_config_pset().
>> The error reporting is redundant and also the "else if ()" can be removed.
>>
> 
> NAK. Please don't do this. I have been working on MEM_TO_MEM support as
> well so leave it as it is for future.

Sure. It is still valid to say that the error else {} will never going to
happen since you have the same check in the calling function and they already
filtered the non implemented direction.

I'll leave this out from v3.

-- 
Péter

> 
> Thanks,
> -Joel
> 
>> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
>> ---
>>  drivers/dma/edma.c | 6 ++----
>>  1 file changed, 2 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
>> index 855766672aa9..d954099650ae 100644
>> --- a/drivers/dma/edma.c
>> +++ b/drivers/dma/edma.c
>> @@ -372,14 +372,12 @@ static int edma_config_pset(struct dma_chan *chan, struct edmacc_param *pset,
>>  		src_cidx = cidx;
>>  		dst_bidx = 0;
>>  		dst_cidx = 0;
>> -	} else if (direction == DMA_DEV_TO_MEM)  {
>> +	} else {
>> +		/* DMA_DEV_TO_MEM */
>>  		src_bidx = 0;
>>  		src_cidx = 0;
>>  		dst_bidx = acnt;
>>  		dst_cidx = cidx;
>> -	} else {
>> -		dev_err(dev, "%s: direction not implemented yet\n", __func__);
>> -		return -EINVAL;
>>  	}
>>  
>>  	pset->opt = EDMA_TCC(EDMA_CHAN_SLOT(echan->ch_num));
>>
> 

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