linux-kernel - Re: [PATCH 4/7] dmaengine: sprd: Add device validation to support multiple controllers

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Message-ID: <20190429115723.GK3845@vkoul-mobl.Dlink>
Date:   Mon, 29 Apr 2019 17:27:23 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Baolin Wang <baolin.wang@...aro.org>
Cc:     dan.j.williams@...el.com, eric.long@...soc.com,
        orsonzhai@...il.com, zhang.lyra@...il.com, broonie@...nel.org,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/7] dmaengine: sprd: Add device validation to support
 multiple controllers

On 15-04-19, 20:14, Baolin Wang wrote:
> From: Eric Long <eric.long@...soc.com>
> 
> Since we can support multiple DMA engine controllers, we should add
> device validation in filter function to check if the correct controller
> to be requested.
> 
> Signed-off-by: Eric Long <eric.long@...soc.com>
> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
> ---
>  drivers/dma/sprd-dma.c |    5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
> index 0f92e60..9f99d4b 100644
> --- a/drivers/dma/sprd-dma.c
> +++ b/drivers/dma/sprd-dma.c
> @@ -1020,8 +1020,13 @@ static void sprd_dma_free_desc(struct virt_dma_desc *vd)
>  static bool sprd_dma_filter_fn(struct dma_chan *chan, void *param)
>  {
>  	struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
> +	struct of_phandle_args *dma_spec =
> +		container_of(param, struct of_phandle_args, args[0]);
>  	u32 slave_id = *(u32 *)param;
>  
> +	if (chan->device->dev->of_node != dma_spec->np)

Are you not using of_dma_find_controller() that does this, so this would
be useless!

> +		return false;
> +
>  	schan->dev_id = slave_id;
>  	return true;
>  }
> -- 
> 1.7.9.5

-- 
~Vinod