linux-kernel - Re: [RFC PATCH v2 04/18] i2c: tegra: Fix the error path in tegra_i2c_runtime

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Message-ID: <f7997a48-eaec-839e-e0cd-cde718bd2e72@gmail.com>
Date:   Wed, 17 Jun 2020 07:52:17 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>,
        thierry.reding@...il.com, jonathanh@...dia.com, frankc@...dia.com,
        hverkuil@...all.nl, sakari.ailus@....fi, robh+dt@...nel.org,
        helen.koike@...labora.com
Cc:     sboyd@...nel.org, gregkh@...uxfoundation.org,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-i2c@...r.kernel.org
Subject: Re: [RFC PATCH v2 04/18] i2c: tegra: Fix the error path in
 tegra_i2c_runtime_resume

17.06.2020 04:41, Sowjanya Komatineni пишет:
> tegra_i2c_runtime_resume does not disable prior enabled clocks
> properly.
> 
> This patch fixes it.
> 
> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
> ---
>  drivers/i2c/busses/i2c-tegra.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
> index 3be1018..1b459ca 100644
> --- a/drivers/i2c/busses/i2c-tegra.c
> +++ b/drivers/i2c/busses/i2c-tegra.c
> @@ -668,7 +668,7 @@ static int __maybe_unused tegra_i2c_runtime_resume(struct device *dev)
>  		ret = clk_enable(i2c_dev->slow_clk);
>  		if (ret < 0) {
>  			dev_err(dev, "failed to enable slow clock: %d\n", ret);
> -			return ret;
> +			goto disable_fast_clk;
>  		}
>  	}
>  
> @@ -676,11 +676,16 @@ static int __maybe_unused tegra_i2c_runtime_resume(struct device *dev)
>  	if (ret < 0) {
>  		dev_err(i2c_dev->dev,
>  			"Enabling div clk failed, err %d\n", ret);
> -		clk_disable(i2c_dev->fast_clk);
> -		return ret;
> +		goto disable_slow_clk;
>  	}
>  
>  	return 0;
> +
> +disable_slow_clk:
> +	clk_disable(i2c_dev->slow_clk);
> +disable_fast_clk:
> +	clk_disable(i2c_dev->fast_clk);
> +	return ret;
>  }
>  
>  static int __maybe_unused tegra_i2c_runtime_suspend(struct device *dev)
> 

This looks good to me. Could you please add an additional patch to
remove all the other conditions of the clk enable/disable? The current
code was already inconsistent because in most cases there are
conditions, but not in all cases.