linux-kernel - Re: [PATCH] cpufreq: tegra194: Fix an error handling path in tegra194_cpufreq

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Date:   Tue, 2 May 2023 12:30:11 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Sumit Gupta <sumitg@...dia.com>, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH] cpufreq: tegra194: Fix an error handling path in
 tegra194_cpufreq_probe()

On Tue, Apr 25, 2023 at 03:11:19PM +0200, Christophe JAILLET wrote:
> If the probe needs to be deferred, some resources still need to be
> released. So branch to the error handling path instead of returning
> directly.
> 
> Fixes: f41e1442ac5b ("cpufreq: tegra194: add OPP support and set bandwidth")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> Compile tested-only
> ---
>  drivers/cpufreq/tegra194-cpufreq.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/cpufreq/tegra194-cpufreq.c b/drivers/cpufreq/tegra194-cpufreq.c
> index c8d03346068a..36dad5ea5947 100644
> --- a/drivers/cpufreq/tegra194-cpufreq.c
> +++ b/drivers/cpufreq/tegra194-cpufreq.c
> @@ -686,8 +686,10 @@ static int tegra194_cpufreq_probe(struct platform_device *pdev)
>  
>  	/* Check for optional OPPv2 and interconnect paths on CPU0 to enable ICC scaling */
>  	cpu_dev = get_cpu_device(0);
> -	if (!cpu_dev)
> -		return -EPROBE_DEFER;
> +	if (!cpu_dev) {
> +		err = -EPROBE_DEFER;
> +		goto err_free_res;
> +	}

I think ultimately it'd be better to try get_cpu_device(0) earlier so
that we don't do all that work upfront before we fail. However, it looks
like there's some other improvements that could be done in that area, so
this looks like a good fix in the meantime:

Acked-by: Thierry Reding <treding@...dia.com>

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