Re: [PATCH v8 4/8] PM / EM: add support for other devices than CPUs in Energy Model

[Daniel Lezcano <daniel.lezcano@linaro.org>]

On 27/05/2020 11:58, Lukasz Luba wrote:
> Add support for other devices than CPUs. The registration function
> does not require a valid cpumask pointer and is ready to handle new
> devices. Some of the internal structures has been reorganized in order to
> keep consistent view (like removing per_cpu pd pointers).
> 
> Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
> ---

[ ... ]

>  }
>  EXPORT_SYMBOL_GPL(em_register_perf_domain);
> +
> +/**
> + * em_dev_unregister_perf_domain() - Unregister Energy Model (EM) for a device
> + * @dev		: Device for which the EM is registered
> + *
> + * Try to unregister the EM for the specified device (but not a CPU).
> + */
> +void em_dev_unregister_perf_domain(struct device *dev)
> +{
> +	if (IS_ERR_OR_NULL(dev) || !dev->em_pd)
> +		return;
> +
> +	if (_is_cpu_device(dev))
> +		return;
> +
> +	mutex_lock(&em_pd_mutex);

Is the mutex really needed?

If this function is called that means there is no more user of the
em_pd, no?

> +	em_debug_remove_pd(dev);
> +
> +	kfree(dev->em_pd->table);
> +	kfree(dev->em_pd);
> +	dev->em_pd = NULL;
> +	mutex_unlock(&em_pd_mutex);
> +}
> +EXPORT_SYMBOL_GPL(em_dev_unregister_perf_domain);
> 


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