linux-kernel - Re: [PATCH 1/2] media: ipu3-cio2: Use dma_zalloc_coherent to replace dma_alloc

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Date:   Fri, 24 Aug 2018 10:58:52 +0800
From:   Bing Bu Cao <bingbu.cao@...ux.intel.com>
To:     zhong jiang <zhongjiang@...wei.com>, yong.zhi@...el.com,
        sakari.ailus@...ux.intel.com, bingbu.cao@...el.com,
        mchehab@...nel.org, matthias.bgg@...il.com
Cc:     tian.shu.qiu@...el.com, jian.xu.zheng@...el.com,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org
Subject: Re: [PATCH 1/2] media: ipu3-cio2: Use dma_zalloc_coherent to replace
 dma_alloc_coherent + memset

Hi, Jiang

This looks fine for me in ipu3-cio2.
Actually, we already have this change locally, but I think we miss submit it to community.
Thanks!

On 08/18/2018 11:16 PM, zhong jiang wrote:
> dma_zalloc_coherent has implemented the dma_alloc_coherent() + memset(),
> We prefer to dma_zalloc_coherent instead of open-codeing.
>
> Signed-off-by: zhong jiang <zhongjiang@...wei.com>
> ---
>  drivers/media/pci/intel/ipu3/ipu3-cio2.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/media/pci/intel/ipu3/ipu3-cio2.c b/drivers/media/pci/intel/ipu3/ipu3-cio2.c
> index 2902715..f0c6374 100644
> --- a/drivers/media/pci/intel/ipu3/ipu3-cio2.c
> +++ b/drivers/media/pci/intel/ipu3/ipu3-cio2.c
> @@ -218,13 +218,11 @@ static int cio2_fbpt_init(struct cio2_device *cio2, struct cio2_queue *q)
>  {
>  	struct device *dev = &cio2->pci_dev->dev;
>  
> -	q->fbpt = dma_alloc_coherent(dev, CIO2_FBPT_SIZE, &q->fbpt_bus_addr,
> -				     GFP_KERNEL);
> +	q->fbpt = dma_zalloc_coherent(dev, CIO2_FBPT_SIZE, &q->fbpt_bus_addr,
> +				      GFP_KERNEL);
>  	if (!q->fbpt)
>  		return -ENOMEM;
>  
> -	memset(q->fbpt, 0, CIO2_FBPT_SIZE);
> -
>  	return 0;
>  }
>