linux-kernel - Re: [PATCH v1] cpufreq: kirkwood-cpufreq:- Handle return value of clk_prepare

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Date:   Wed, 17 May 2017 10:04:45 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Arvind Yadav <arvind.yadav.cs@...il.com>
Cc:     rjw@...ysocki.net, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] cpufreq: kirkwood-cpufreq:- Handle return value of
 clk_prepare_enable

On 16-05-17, 12:41, Arvind Yadav wrote:
> Here, Clock enable can failed. So adding an error check for
> clk_prepare_enable.

Rewrite it as:

clk_prepare_enable() can fail here and we must check its return value.

> Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
> ---
>  drivers/cpufreq/kirkwood-cpufreq.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/cpufreq/kirkwood-cpufreq.c b/drivers/cpufreq/kirkwood-cpufreq.c
> index 1b9bcd7..4c30103 100644
> --- a/drivers/cpufreq/kirkwood-cpufreq.c
> +++ b/drivers/cpufreq/kirkwood-cpufreq.c
> @@ -127,7 +127,12 @@ static int kirkwood_cpufreq_probe(struct platform_device *pdev)
>  		return PTR_ERR(priv.cpu_clk);
>  	}
>  
> -	clk_prepare_enable(priv.cpu_clk);
> +	err = clk_prepare_enable(priv.cpu_clk);
> +	if (err) {
> +		dev_err(priv.dev, "Unable to prepare cpuclk\n");
> +		return err;
> +	}
> +
>  	kirkwood_freq_table[0].frequency = clk_get_rate(priv.cpu_clk) / 1000;
>  
>  	priv.ddr_clk = of_clk_get_by_name(np, "ddrclk");
> @@ -137,7 +142,11 @@ static int kirkwood_cpufreq_probe(struct platform_device *pdev)
>  		goto out_cpu;
>  	}
>  
> -	clk_prepare_enable(priv.ddr_clk);
> +	err = clk_prepare_enable(priv.ddr_clk);
> +	if (err) {
> +		dev_err(priv.dev, "Unable to prepare ddrclk\n");
> +		goto out_cpu;
> +	}
>  	kirkwood_freq_table[1].frequency = clk_get_rate(priv.ddr_clk) / 1000;
>  
>  	priv.powersave_clk = of_clk_get_by_name(np, "powersave");

There is one more prepare-enable after this. Why not fix that as well
?

-- 
viresh