linux-kernel - Re: [PATCH] clk: qcom: gdsc: add missing error handling

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Message-ID: <20220929163430.ozkfdiv5n2snwhkn@builder.lan>
Date:   Thu, 29 Sep 2022 11:34:30 -0500
From:   Bjorn Andersson <andersson@...nel.org>
To:     Johan Hovold <johan+linaro@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: qcom: gdsc: add missing error handling

On Thu, Sep 29, 2022 at 05:58:16PM +0200, Johan Hovold wrote:
> Since commit 7eb231c337e0 ("PM / Domains: Convert pm_genpd_init() to
> return an error code") pm_genpd_init() can return an error which the
> caller must handle.
> 
> The current error handling was also incomplete as the runtime PM and
> regulator use counts were not balanced in all error paths.
> 
> Add the missing error handling to the GDSC initialisation to avoid
> continuing as if nothing happened on errors.
> 
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>

Reviewed-by: Bjorn Andersson <andersson@...nel.org>

Regards,
Bjorn

> ---
>  drivers/clk/qcom/gdsc.c | 25 +++++++++++++++++--------
>  1 file changed, 17 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c
> index e1d6574d2797..0b67bd72e217 100644
> --- a/drivers/clk/qcom/gdsc.c
> +++ b/drivers/clk/qcom/gdsc.c
> @@ -451,11 +451,8 @@ static int gdsc_init(struct gdsc *sc)
>  
>  		/* ...and the power-domain */
>  		ret = gdsc_pm_runtime_get(sc);
> -		if (ret) {
> -			if (sc->rsupply)
> -				regulator_disable(sc->rsupply);
> -			return ret;
> -		}
> +		if (ret)
> +			goto err_disable_supply;
>  
>  		/*
>  		 * Votable GDSCs can be ON due to Vote from other masters.
> @@ -464,14 +461,14 @@ static int gdsc_init(struct gdsc *sc)
>  		if (sc->flags & VOTABLE) {
>  			ret = gdsc_update_collapse_bit(sc, false);
>  			if (ret)
> -				return ret;
> +				goto err_put_rpm;
>  		}
>  
>  		/* Turn on HW trigger mode if supported */
>  		if (sc->flags & HW_CTRL) {
>  			ret = gdsc_hwctrl(sc, true);
>  			if (ret < 0)
> -				return ret;
> +				goto err_put_rpm;
>  		}
>  
>  		/*
> @@ -498,9 +495,21 @@ static int gdsc_init(struct gdsc *sc)
>  		sc->pd.power_off = gdsc_disable;
>  	if (!sc->pd.power_on)
>  		sc->pd.power_on = gdsc_enable;
> -	pm_genpd_init(&sc->pd, NULL, !on);
> +
> +	ret = pm_genpd_init(&sc->pd, NULL, !on);
> +	if (ret)
> +		goto err_put_rpm;
>  
>  	return 0;
> +
> +err_put_rpm:
> +	if (on)
> +		gdsc_pm_runtime_put(sc);
> +err_disable_supply:
> +	if (on && sc->rsupply)
> +		regulator_disable(sc->rsupply);
> +
> +	return ret;
>  }
>  
>  int gdsc_register(struct gdsc_desc *desc,
> -- 
> 2.35.1
>