linux-kernel - Re: [PATCH 2/3] cpufreq: governor: Rearrange governor data structures

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Message-ID: <20160207154556.GG3808@vireshk>
Date:	Sun, 7 Feb 2016 21:15:56 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Linux PM list <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Juri Lelli <juri.lelli@....com>,
	Steve Muckle <steve.muckle@...aro.org>,
	Saravana Kannan <skannan@...eaurora.org>
Subject: Re: [PATCH 2/3] cpufreq: governor: Rearrange governor data structures

On 07-02-16, 16:24, Rafael J. Wysocki wrote:
>  static int cpufreq_governor_exit(struct cpufreq_policy *policy)
>  {
>  	struct dbs_governor *gov = dbs_governor_of(policy);
> -	struct dbs_data *dbs_data = policy->governor_data;
> -	struct cpu_dbs_info *cdbs = gov->get_cpu_cdbs(policy->cpu);
> +	struct policy_dbs_info *policy_dbs = policy->governor_data;
> +	struct dbs_data *dbs_data = policy_dbs->dbs_data;
>  
>  	/* State should be equivalent to INIT */
> -	if (!cdbs->policy_dbs || cdbs->policy_dbs->policy)
> +	if (policy_dbs->policy)
>  		return -EBUSY;

We can crash here if policy_dbs is NULL, which can happen if EXIT is called
twice (due to the lock-dropping thing in cpufreq-core). So we really need to
keep these checks for now atleast.

-- 
viresh