linux-kernel - RE: [PATCH resend v3] reset: renesas: Fix Runtime PM usage

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Date:   Wed, 15 Dec 2021 10:18:08 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     Heiner Kallweit <hkallweit1@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>
CC:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH resend v3] reset: renesas: Fix Runtime PM usage

Hi Heiner,

Thanks for the patch.

> Subject: [PATCH resend v3] reset: renesas: Fix Runtime PM usage
> 
> If pm_runtime_resume_and_get() fails then it returns w/o the RPM usage
> counter being incremented. In this case call pm_runtime_put() in
> remove() will result in a usage counter imbalance. Therefore check the
> return code of pm_runtime_resume_and_get() and bail out in case of error.
> 
> Fixes: bee08559701f ("reset: renesas: Add RZ/G2L usbphy control driver")
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>

Reviewed-by: Biju Das <biju.das.jz@...renesas.com>

Cheers,
Biju

> ---
> v2:
> - bail out in case of error instead of switching to pm_runtime_get_sync()
> v3:
> - add dev_err_probe() in case of error
> ---
>  drivers/reset/reset-rzg2l-usbphy-ctrl.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/reset/reset-rzg2l-usbphy-ctrl.c
> b/drivers/reset/reset-rzg2l-usbphy-ctrl.c
> index e0704fd2b..46fcd2218 100644
> --- a/drivers/reset/reset-rzg2l-usbphy-ctrl.c
> +++ b/drivers/reset/reset-rzg2l-usbphy-ctrl.c
> @@ -137,7 +137,12 @@ static int rzg2l_usbphy_ctrl_probe(struct
> platform_device *pdev)
>  	dev_set_drvdata(dev, priv);
> 
>  	pm_runtime_enable(&pdev->dev);
> -	pm_runtime_resume_and_get(&pdev->dev);
> +	error = pm_runtime_resume_and_get(&pdev->dev);
> +	if (error < 0) {
> +		pm_runtime_disable(&pdev->dev);
> +		reset_control_assert(priv->rstc);
> +		return dev_err_probe(&pdev->dev, error,
> "pm_runtime_resume_and_get failed");
> +	}
> 
>  	/* put pll and phy into reset state */
>  	spin_lock_irqsave(&priv->lock, flags);
> --
> 2.34.1