linux-kernel - Re: [PATCH v1 8/9] scsi: ufs: enable runtime pm only after ufshcd init

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Date:   Fri, 20 Jul 2018 17:05:58 -0700
From:   Subhash Jadavani <subhashj@...eaurora.org>
To:     Asutosh Das <asutoshd@...eaurora.org>
Cc:     cang@...eaurora.org, vivek.gautam@...eaurora.org,
        rnayak@...eaurora.org, vinholikatti@...il.com,
        jejb@...ux.vnet.ibm.com, martin.petersen@...cle.com,
        linux-scsi@...r.kernel.org, Gilad Broner <gbroner@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-scsi-owner@...r.kernel.org
Subject: Re: [PATCH v1 8/9] scsi: ufs: enable runtime pm only after ufshcd
 init

On 2018-07-06 05:30, Asutosh Das wrote:
> From: Gilad Broner <gbroner@...eaurora.org>
> 
> Previous code enables runtime pm before ufshcd_init() is completed,
> and before the hba struct is stored in the platform device private
> data. This means that pm runtime calls will have null hba pointer
> as well as partially initialized driver.
> Instead, enable pm runtime only after ufshcd_init() is done and
> after hba struct is stored in the platform device private data.
> 
> Signed-off-by: Gilad Broner <gbroner@...eaurora.org>
> Signed-off-by: Can Guo <cang@...eaurora.org>
> Signed-off-by: Asutosh Das <asutoshd@...eaurora.org>
> ---
>  drivers/scsi/ufs/ufshcd-pltfrm.c | 11 ++++-------
>  1 file changed, 4 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c 
> b/drivers/scsi/ufs/ufshcd-pltfrm.c
> index 7dba799..8332d99 100644
> --- a/drivers/scsi/ufs/ufshcd-pltfrm.c
> +++ b/drivers/scsi/ufs/ufshcd-pltfrm.c
> @@ -354,24 +354,21 @@ int ufshcd_pltfrm_init(struct platform_device 
> *pdev,
>  	}
> 
>  	ufshcd_parse_pm_levels(hba);
> -	pm_runtime_set_active(&pdev->dev);
> -	pm_runtime_enable(&pdev->dev);
> 
>  	ufshcd_init_lanes_per_dir(hba);
> 
>  	err = ufshcd_init(hba, mmio_base, irq);
>  	if (err) {
>  		dev_err(dev, "Initialization failed\n");
> -		goto out_disable_rpm;
> +		goto dealloc_host;
>  	}
> 
>  	platform_set_drvdata(pdev, hba);
> 
> -	return 0;
> +	pm_runtime_set_active(&pdev->dev);
> +	pm_runtime_enable(&pdev->dev);
> 
> -out_disable_rpm:
> -	pm_runtime_disable(&pdev->dev);
> -	pm_runtime_set_suspended(&pdev->dev);
> +	return 0;
>  dealloc_host:
>  	ufshcd_dealloc_host(hba);
>  out:

Looks good to me.
Reviewed-by: Subhash Jadavani <subhashj@...eaurora.org>

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