linux-kernel - Re: [PATCH] drm: xlnx: zynqmp_dpsub: Add missing check for dma_set

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Message-ID: <20230607050705.GF14101@pendragon.ideasonboard.com>
Date:   Wed, 7 Jun 2023 08:07:05 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>
Cc:     hyun.kwon@...inx.com, airlied@...il.com, daniel@...ll.ch,
        michal.simek@....com, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Subject: Re: [PATCH] drm: xlnx: zynqmp_dpsub: Add missing check for
 dma_set_mask

Hello Jiasheng,

Thank you for the patch.

On Wed, Jun 07, 2023 at 10:05:29AM +0800, Jiasheng Jiang wrote:
> Add check for dma_set_mask() and return the error if it fails.
> 
> Fixes: d76271d22694 ("drm: xlnx: DRM/KMS driver for Xilinx ZynqMP DisplayPort Subsystem")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
> ---
>  drivers/gpu/drm/xlnx/zynqmp_dpsub.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/xlnx/zynqmp_dpsub.c b/drivers/gpu/drm/xlnx/zynqmp_dpsub.c
> index bab862484d42..068413be6527 100644
> --- a/drivers/gpu/drm/xlnx/zynqmp_dpsub.c
> +++ b/drivers/gpu/drm/xlnx/zynqmp_dpsub.c
> @@ -227,7 +227,9 @@ static int zynqmp_dpsub_probe(struct platform_device *pdev)
>  	dpsub->dev = &pdev->dev;
>  	platform_set_drvdata(pdev, dpsub);
>  
> -	dma_set_mask(dpsub->dev, DMA_BIT_MASK(ZYNQMP_DISP_MAX_DMA_BIT));
> +	ret = dma_set_mask(dpsub->dev, DMA_BIT_MASK(ZYNQMP_DISP_MAX_DMA_BIT));
> +	if (ret)
> +		return ret;

This seems reasonable.

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

Tomi, would you be able to quickly test this ?

>  
>  	/* Try the reserved memory. Proceed if there's none. */
>  	of_reserved_mem_device_init(&pdev->dev);

-- 
Regards,

Laurent Pinchart