linux-kernel - Re: [PATCH 1/2] [media] vb2: Store dma_dir in vb2

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Date:   Thu, 20 Oct 2016 10:20:05 +0200
From:   Thierry Escande <thierry.escande@...labora.com>
To:     Sakari Ailus <sakari.ailus@....fi>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Pawel Osciak <pawel@...iak.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>
Subject: Re: [PATCH 1/2] [media] vb2: Store dma_dir in vb2_queue

Hi Sakari,

On 19/10/2016 23:29, Sakari Ailus wrote:
> Hi Thierry,
>
> On Wed, Oct 19, 2016 at 10:24:16AM +0200, Thierry Escande wrote:
>> From: Pawel Osciak <posciak@...omium.org>
>>
>> Store dma_dir in struct vb2_queue and reuse it, instead of recalculating
>> it each time.
>>
>> Signed-off-by: Pawel Osciak <posciak@...omium.org>
>> Tested-by: Pawel Osciak <posciak@...omium.org>
>> Reviewed-by: Tomasz Figa <tfiga@...omium.org>
>> Reviewed-by: Owen Lin <owenlin@...omium.org>
>> Signed-off-by: Thierry Escande <thierry.escande@...labora.com>
>> ---
>>  drivers/media/v4l2-core/videobuf2-core.c | 12 +++---------
>>  drivers/media/v4l2-core/videobuf2-v4l2.c |  2 ++
>>  include/media/videobuf2-core.h           |  2 ++
>>  3 files changed, 7 insertions(+), 9 deletions(-)
>>
>> diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
>> index 21900202..f12103c 100644
>> --- a/drivers/media/v4l2-core/videobuf2-core.c
>> +++ b/drivers/media/v4l2-core/videobuf2-core.c
>> @@ -194,8 +194,6 @@ static void __enqueue_in_driver(struct vb2_buffer *vb);
>>  static int __vb2_buf_mem_alloc(struct vb2_buffer *vb)
>>  {
>>  	struct vb2_queue *q = vb->vb2_queue;
>> -	enum dma_data_direction dma_dir =
>> -		q->is_output ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
>>  	void *mem_priv;
>>  	int plane;
>>  	int ret = -ENOMEM;
>> @@ -209,7 +207,7 @@ static int __vb2_buf_mem_alloc(struct vb2_buffer *vb)
>>
>>  		mem_priv = call_ptr_memop(vb, alloc,
>>  				q->alloc_devs[plane] ? : q->dev,
>> -				q->dma_attrs, size, dma_dir, q->gfp_flags);
>> +				q->dma_attrs, size, q->dma_dir, q->gfp_flags);
>
> My bad, I guess I expressed myself unclearly.
>
> Could you introduce the macro in this patch? You can then remove q->dma_dir
> altogether.
My bad. Sorry for the confusion...

The v3 is on its way.

Regards,
  Thierry