linux-kernel - Re: [PATCH V2 7/8] ARM: cpuidle: Register per cpuidle device

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Date:	Thu, 19 Mar 2015 12:44:27 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
CC:	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"robherring2@...il.com" <robherring2@...il.com>,
	"arnd@...db.de" <arnd@...db.de>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"lina.iyer@...aro.org" <lina.iyer@...aro.org>
Subject: Re: [PATCH V2 7/8] ARM: cpuidle: Register per cpuidle device

On 03/19/2015 12:38 PM, Lorenzo Pieralisi wrote:
> On Thu, Mar 19, 2015 at 11:27:20AM +0000, Daniel Lezcano wrote:
>
> [...]
>
>>>>    	for_each_possible_cpu(cpu) {
>>>>    		ret = arm_cpuidle_init(cpu);
>>>> +
>>>> +		/* This cpu does not support any idle states */
>>>> +		if (ret == -ENOSYS)
>>>> +			continue;
>>>> +
>>>>    		if (ret) {
>>>>    			pr_err("CPU %d failed to init idle CPU ops\n", cpu);
>>>> -			return ret;
>>>> +			goto out_fail;
>>>> +		}
>>>> +
>>>> +		dev = kzalloc(sizeof(*dev), GFP_KERNEL);
>>>> +		if (!dev) {
>>>> +			pr_err("Failed to allocate cpuidle device\n");
>>>> +			goto out_fail;
>>>> +		}
>>>> +
>>>> +		dev->cpu = cpu;
>>>> +		per_cpu(cpuidle_arm_dev, cpu) = dev;
>>>> +
>>>> +		ret = cpuidle_register_device(dev);
>>>> +		if (ret) {
>>>> +			pr_err("Failed to register cpuidle device for CPU %d\n",
>>>> +			       cpu);
>>>> +			kfree(dev);
>>>> +			goto out_fail;
>>>>    		}
>>>>    	}
>>>> +out:
>>>> +	return ret;
>>>
>>> return 0;
>>>
>>>>
>>>> -	return cpuidle_register(drv, NULL);
>>>> +out_fail:
>>>> +	for (cpu--; cpu <= 0; cpu--) {
>>>
>>> This loop is wrong.
>>
>> Why is it wrong ? We have to initialize at cpu - 1 to unregister the
>> previous registered cpu, not the current one, no ?
>
> Yes, but on cpu>=0 not cpu<=0
>
> while (--cpu >= 0)

Ah, yes. Thanks for spotting this.

   -- Daniel


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