linux-kernel - Re: [PATCH] scsi: ufs: Fix runtime PM imbalance on error

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Message-ID: <73cb87f7-52ac-1a18-364e-977080cc149c@ti.com>
Date:   Tue, 26 May 2020 15:37:45 +0530
From:   Vignesh Raghavendra <vigneshr@...com>
To:     Dinghao Liu <dinghao.liu@....edu.cn>, <kjlu@....edu>
CC:     Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] scsi: ufs: Fix runtime PM imbalance on error

Hi,

On 22/05/20 10:23 am, Dinghao Liu wrote:
> When devm_clk_get() returns an error code, a pairing
> runtime PM usage counter decrement is needed to keep
> the counter balanced.
> 
> Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
> ---

Thanks for the patch! But this fix is incomplete, I have posted 
a more comprehensive fix at [1].. Please take a look!

[1] https://lore.kernel.org/linux-scsi/20200526100340.15032-1-vigneshr@ti.com/T/#u

>  drivers/scsi/ufs/ti-j721e-ufs.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/scsi/ufs/ti-j721e-ufs.c b/drivers/scsi/ufs/ti-j721e-ufs.c
> index 5216d228cdd9..f3f212f6f9a9 100644
> --- a/drivers/scsi/ufs/ti-j721e-ufs.c
> +++ b/drivers/scsi/ufs/ti-j721e-ufs.c
> @@ -39,6 +39,7 @@ static int ti_j721e_ufs_probe(struct platform_device *pdev)
>  	clk = devm_clk_get(dev, NULL);
>  	if (IS_ERR(clk)) {
>  		dev_err(dev, "Cannot claim MPHY clock.\n");
> +		pm_runtime_put_sync(dev);
>  		return PTR_ERR(clk);
>  	}
>  	clk_rate = clk_get_rate(clk);
> 


Regards
Vignesh