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Message-ID: <8ee5dfd0-558b-5ad6-63d2-b142550f04a3@arm.com>
Date:   Tue, 26 Apr 2022 16:40:32 +0100
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Subject: Re: [PATCH v1] PM: EM: Decrement policy counter
Content-Language: en-US
To:     Pierre Gondois <pierre.gondois@arm.com>,
        linux-kernel@vger.kernel.org
Cc:     cristian.marussi@arm.com, Ionela.Voinescu@arm.com,
        Dietmar.Eggemann@arm.com, "Rafael J. Wysocki" <rafael@kernel.org>,
        Pavel Machek <pavel@ucw.cz>, Len Brown <len.brown@intel.com>,
        Viresh Kumar <viresh.kumar@linaro.org>,
        linux-pm@vger.kernel.org
References: <20220426144448.43682-1-pierre.gondois@arm.com>
From:   Vincent Donnefort <vincent.donnefort@arm.com>
In-Reply-To: <20220426144448.43682-1-pierre.gondois@arm.com>
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On 26/04/2022 15:44, Pierre Gondois wrote:
> From: Pierre Gondois <Pierre.Gondois@arm.com>
> 
> Fixes: e458716a92b57 ("PM: EM: Mark inefficiencies in CPUFreq")
> In the above commit, cpufreq_cpu_get() is called without
> a cpufreq_cpu_put(), permanently increasing the reference counts
> of the policy struct.
> Decrement the reference count once the policy struct is not used
> anymore.


Not sure if the tag there will be caught properly. Usually it goes on
top of the Signed-off-by.

While at it:

Reviewed-by: Vincent Donnefort <vincent.donnefort@arm.com>

Thanks for fixing this.

> 
> Tested-by: Cristian Marussi <cristian.marussi@arm.com>
> Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
> ---
>   kernel/power/energy_model.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c
> index 0153b0ca7b23..6219aaa454b5 100644
> --- a/kernel/power/energy_model.c
> +++ b/kernel/power/energy_model.c
> @@ -259,6 +259,8 @@ static void em_cpufreq_update_efficiencies(struct device *dev)
>   			found++;
>   	}
>   
> +	cpufreq_cpu_put(policy);
> +
>   	if (!found)
>   		return;
>