linux-kernel - Re: [PATCH] media: xilinx: Use dma_request_chan() instead dma_request_slave

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Message-ID: <20200109164847.GF31792@pendragon.ideasonboard.com>
Date:   Thu, 9 Jan 2020 18:48:47 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Peter Ujfalusi <peter.ujfalusi@...com>
Cc:     mchehab@...nel.org, hyun.kwon@...inx.com, vkoul@...nel.org,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        michal.simek@...inx.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] media: xilinx: Use dma_request_chan() instead
 dma_request_slave_channel()

Hi Peter,

Thank you for the patch.

On Tue, Dec 17, 2019 at 12:42:35PM +0200, Peter Ujfalusi wrote:
> dma_request_slave_channel() is a wrapper on top of dma_request_chan()
> eating up the error code.
> 
> By using dma_request_chan() directly the driver can support deferred
> probing against DMA.
> 
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

Vinod, could you please pick this up ?

> ---
>  drivers/media/platform/xilinx/xilinx-dma.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/media/platform/xilinx/xilinx-dma.c b/drivers/media/platform/xilinx/xilinx-dma.c
> index b211380a11f2..9ce515ff9c0a 100644
> --- a/drivers/media/platform/xilinx/xilinx-dma.c
> +++ b/drivers/media/platform/xilinx/xilinx-dma.c
> @@ -725,10 +725,10 @@ int xvip_dma_init(struct xvip_composite_device *xdev, struct xvip_dma *dma,
>  
>  	/* ... and the DMA channel. */
>  	snprintf(name, sizeof(name), "port%u", port);
> -	dma->dma = dma_request_slave_channel(dma->xdev->dev, name);
> -	if (dma->dma == NULL) {
> +	dma->dma = dma_request_chan(dma->xdev->dev, name);
> +	if (IS_ERR(dma->dma)) {
>  		dev_err(dma->xdev->dev, "no VDMA channel found\n");
> -		ret = -ENODEV;
> +		ret = PTR_ERR(dma->dma);
>  		goto error;
>  	}
>  

-- 
Regards,

Laurent Pinchart