linux-kernel - Re: [PATCH] drm/msm: Check return value of of_dma

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Message-ID: <6hunbphnn2m647swkujhyjywp3e7vnlxhrbye5tjakvlfclimc@j64qbwen2hh4>
Date: Sat, 30 Nov 2024 03:58:03 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Sui Jingfeng <sui.jingfeng@...ux.dev>
Cc: Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>, 
	Konrad Dybcio <konradybcio@...nel.org>, Marijn Suijten <marijn.suijten@...ainline.org>, 
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, linux-arm-msm@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/msm: Check return value of of_dma_configure()

On Mon, Nov 04, 2024 at 05:07:38PM +0800, Sui Jingfeng wrote:
> Because the of_dma_configure() will returns '-EPROBE_DEFER' if the probe
> procedure of the specific platform IOMMU driver is not finished yet. It
> can also return other error code for various reasons.
> 
> Stop pretending that it will always suceess, quit if it fail.
> 
> Signed-off-by: Sui Jingfeng <sui.jingfeng@...ux.dev>
> ---
>  drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)

Fixes: 29ac8979cdf7 ("drm/msm/a6xx: use msm_gem for GMU memory objects")
Fixes: 5a903a44a984 ("drm/msm/a6xx: Introduce GMU wrapper support")

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>


> 
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> index 37927bdd6fbe..b26dfe0a76c5 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> @@ -1605,7 +1605,9 @@ int a6xx_gmu_wrapper_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
>  
>  	gmu->dev = &pdev->dev;
>  
> -	of_dma_configure(gmu->dev, node, true);
> +	ret = of_dma_configure(gmu->dev, node, true);
> +	if (ret)
> +		return ret;
>  
>  	pm_runtime_enable(gmu->dev);
>  
> @@ -1670,7 +1672,9 @@ int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
>  
>  	gmu->dev = &pdev->dev;
>  
> -	of_dma_configure(gmu->dev, node, true);
> +	ret = of_dma_configure(gmu->dev, node, true);
> +	if (ret)
> +		return ret;
>  
>  	/* Fow now, don't do anything fancy until we get our feet under us */
>  	gmu->idle_level = GMU_IDLE_STATE_ACTIVE;
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry