linux-kernel - Re: [PATCH 05/31] opp: Add devres wrapper for dev_pm_opp_register

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Date:   Mon, 4 Jan 2021 12:45:31 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Yangtao Li <tiny.windzz@...il.com>
Cc:     myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
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Subject: Re: [PATCH 05/31] opp: Add devres wrapper for
 dev_pm_opp_register_notifier

On 01-01-21, 16:54, Yangtao Li wrote:
> Add devres wrapper for dev_pm_opp_register_notifier() to simplify driver
> code.
> 
> Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
> ---
>  drivers/opp/core.c     | 38 ++++++++++++++++++++++++++++++++++++++
>  include/linux/pm_opp.h |  6 ++++++
>  2 files changed, 44 insertions(+)
> 
> diff --git a/drivers/opp/core.c b/drivers/opp/core.c
> index 6b83e373f0d8..ef3544f8cecd 100644
> --- a/drivers/opp/core.c
> +++ b/drivers/opp/core.c
> @@ -2599,6 +2599,44 @@ int dev_pm_opp_unregister_notifier(struct device *dev,
>  }
>  EXPORT_SYMBOL(dev_pm_opp_unregister_notifier);
>  
> +static void devm_pm_opp_notifier_release(struct device *dev, void *res)
> +{
> +	struct notifier_block *nb = *(struct notifier_block **)res;
> +
> +	WARN_ON(dev_pm_opp_unregister_notifier(dev, nb));
> +}
> +
> +/**
> + * devm_pm_opp_register_notifier() - Register OPP notifier for the device
> + * @dev:	Device for which notifier needs to be registered
> + * @nb:		Notifier block to be registered
> + *
> + * Return: 0 on success or a negative error value.
> + *
> + * The notifier will be unregistered after the device is destroyed.
> + */
> +int devm_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb)
> +{
> +	struct notifier_block **ptr;
> +	int ret;
> +
> +	ptr = devres_alloc(devm_pm_opp_notifier_release, sizeof(*ptr), GFP_KERNEL);
> +	if (!ptr)
> +		return -ENOMEM;
> +
> +	ret = dev_pm_opp_register_notifier(dev, nb);
> +	if (ret) {
> +		devres_free(ptr);
> +		return ret;
> +	}
> +
> +	*ptr = nb;
> +	devres_add(dev, ptr);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(devm_pm_opp_register_notifier);

I am not in favor of this patch, and it only has one user, which makes
it more unwanted.

-- 
viresh