linux-kernel - Re: [PATCH 2/2] thermal_hwmon: Pass the originating device down to hwmon_device_register_with

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Date:   Wed, 18 Jul 2018 11:43:39 +0200
From:   Enric Balletbo Serra <eballetbo@...il.com>
To:     marc.zyngier@....com
Cc:     Zhang Rui <rui.zhang@...el.com>,
        Eduardo Valentin <edubezval@...il.com>,
        Linux PM list <linux-pm@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] thermal_hwmon: Pass the originating device down to hwmon_device_register_with_info

Missatge de Marc Zyngier <marc.zyngier@....com> del dia dt., 10 de
jul. 2018 a les 17:41:
>
> When registering the hwmon device, we pass NULL as the device.
> While this doesn't result in any immediate breakage, it leaves
> the hwmon device at the root of the virtual devices, rather than
> attached to the thermal zone hierarchy.
>
> Instead, let's pass the actual device, which is part of the
> thermal_zone_device structure. This also avoids the rather
> unpleasant ""NULL device *" which can be generated by dev_{err,info}
> in the hwmon subsystem.
>
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>
> ---
>  drivers/thermal/thermal_hwmon.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/thermal/thermal_hwmon.c b/drivers/thermal/thermal_hwmon.c
> index 0bd47007c57f..40c69a533b24 100644
> --- a/drivers/thermal/thermal_hwmon.c
> +++ b/drivers/thermal/thermal_hwmon.c
> @@ -143,7 +143,7 @@ int thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
>         INIT_LIST_HEAD(&hwmon->tz_list);
>         strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
>         strreplace(hwmon->type, '-', '_');
> -       hwmon->device = hwmon_device_register_with_info(NULL, hwmon->type,
> +       hwmon->device = hwmon_device_register_with_info(&tz->device, hwmon->type,
>                                                         hwmon, NULL, NULL);
>         if (IS_ERR(hwmon->device)) {
>                 result = PTR_ERR(hwmon->device);
> --
> 2.18.0
>

Tested-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>

Best regards,
 Enric