linux-kernel - Re: [PATCH v3 6/7] thermal/drivers/cpu_cooling: Introduce the cpu idle cooling driver

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Date:   Fri, 13 Apr 2018 13:46:07 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Daniel Thompson <daniel.thompson@...aro.org>
Cc:     viresh.kumar@...aro.org, edubezval@...il.com,
        kevin.wangtao@...aro.org, leo.yan@...aro.org,
        vincent.guittot@...aro.org, linux-kernel@...r.kernel.org,
        javi.merino@...nel.org, rui.zhang@...el.com,
        linux-pm@...r.kernel.org,
        Amit Daniel Kachhap <amit.kachhap@...il.com>
Subject: Re: [PATCH v3 6/7] thermal/drivers/cpu_cooling: Introduce the cpu
 idle cooling driver

On 13/04/2018 13:38, Daniel Thompson wrote:

[ ... ]

>> +		/*
>> +		 * Allocate the cpuidle cooling device with the list
>> +		 * of the cpus belonging to the cluster.
>> +		 */
>> +		idle_cdev = cpuidle_cooling_alloc(topology_core_cpumask(cpu));
>> +		if (!idle_cdev)
>> +			goto out;
> 
> Perhaps nitpicking but it might be better to set ret to -ENOMEM here 
> and avoid initializing it during the declarations.
> 
> There's no bug in the current form since ret is never assigned to
> outside of the error paths, but the unwritten assumption that ret keeps
> its original value throughout the loop seems like a bit of a landmine
> w.r.t. future maintainance.

Agree.

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