linux-kernel - Re: [PATCH 1/2] dmaengine: sprd: delete enable opreation in probe

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <ZWCg9hmfvexyn7xK@matsya>
Date:   Fri, 24 Nov 2023 18:41:18 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Kaiwei Liu <kaiwei.liu@...soc.com>
Cc:     Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        kaiwei liu <liukaiwei086@...il.com>,
        Wenming Wu <wenming.wu@...soc.com>
Subject: Re: [PATCH 1/2] dmaengine: sprd: delete enable opreation in probe

On 02-11-23, 20:16, Kaiwei Liu wrote:
> From: "kaiwei.liu" <kaiwei.liu@...soc.com>

Typo is subject line

> 
> In the probe of dma, it will allocate device memory and do some
> initalization settings. All operations are only at the software
> level and don't need the DMA hardware power on. It doesn't need
> to resume the device and set the device active as well. here
> delete unnecessary operation.

Don't you need to read or write to the device? Without enable that wont
work right?

Lastly patches appear disjoint, pls thread them properly

> 
> Signed-off-by: kaiwei.liu <kaiwei.liu@...soc.com>
> ---
>  drivers/dma/sprd-dma.c | 19 ++-----------------
>  1 file changed, 2 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
> index 08fcf1ec368c..8ab5a9082fc5 100644
> --- a/drivers/dma/sprd-dma.c
> +++ b/drivers/dma/sprd-dma.c
> @@ -1203,21 +1203,11 @@ static int sprd_dma_probe(struct platform_device *pdev)
>  	}
>  
>  	platform_set_drvdata(pdev, sdev);
> -	ret = sprd_dma_enable(sdev);
> -	if (ret)
> -		return ret;
> -
> -	pm_runtime_set_active(&pdev->dev);
> -	pm_runtime_enable(&pdev->dev);
> -
> -	ret = pm_runtime_get_sync(&pdev->dev);
> -	if (ret < 0)
> -		goto err_rpm;
>  
>  	ret = dma_async_device_register(&sdev->dma_dev);
>  	if (ret < 0) {
>  		dev_err(&pdev->dev, "register dma device failed:%d\n", ret);
> -		goto err_register;
> +		return ret;
>  	}
>  
>  	sprd_dma_info.dma_cap = sdev->dma_dev.cap_mask;
> @@ -1226,16 +1216,11 @@ static int sprd_dma_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto err_of_register;
>  
> -	pm_runtime_put(&pdev->dev);
> +	pm_runtime_enable(&pdev->dev);
>  	return 0;
>  
>  err_of_register:
>  	dma_async_device_unregister(&sdev->dma_dev);
> -err_register:
> -	pm_runtime_put_noidle(&pdev->dev);
> -	pm_runtime_disable(&pdev->dev);
> -err_rpm:
> -	sprd_dma_disable(sdev);
>  	return ret;
>  }
>  
> -- 
> 2.17.1

-- 
~Vinod