linux-kernel - Re: [PATCH v2 6/6] hwmon: pmbus: use more devres helpers

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Date:   Thu, 2 Jul 2020 14:44:19 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Jonathan Corbet <corbet@....net>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Jean Delvare <jdelvare@...e.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH v2 6/6] hwmon: pmbus: use more devres helpers

On Mon, Jun 29, 2020 at 08:50:08AM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> 
> Shrink pmbus code by using devm_hwmon_device_register_with_groups()
> and devm_krealloc() instead of their non-managed variants.
> 
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> ---
>  drivers/hwmon/pmbus/pmbus_core.c | 28 +++++++++-------------------
>  1 file changed, 9 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
> index a420877ba533..225d0ac162c7 100644
> --- a/drivers/hwmon/pmbus/pmbus_core.c
> +++ b/drivers/hwmon/pmbus/pmbus_core.c
> @@ -1022,9 +1022,9 @@ static int pmbus_add_attribute(struct pmbus_data *data, struct attribute *attr)
>  {
>  	if (data->num_attributes >= data->max_attributes - 1) {
>  		int new_max_attrs = data->max_attributes + PMBUS_ATTR_ALLOC_SIZE;
> -		void *new_attrs = krealloc(data->group.attrs,
> -					   new_max_attrs * sizeof(void *),
> -					   GFP_KERNEL);
> +		void *new_attrs = devm_krealloc(data->dev, data->group.attrs,
> +						new_max_attrs * sizeof(void *),
> +						GFP_KERNEL);

dynamic sysfs attributes in a devm-allocated chunk of memory?  What
could go wrong...

Anyway, is this the only in-kernel user that you could find for this
function?  If so, it feels like it's a lot of extra work for no real
gain.

thanks,

greg k-h