linux-kernel - Re: [PATCH 4.19 v1 1/2] hwmon: Introduce hwmon_device_register_for

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Message-ID: <YrzdyUm/xlJPldwP@google.com>
Date:   Wed, 29 Jun 2022 23:18:33 +0000
From:   William McVicker <willmcvicker@...gle.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     stable@...r.kernel.org, Jean Delvare <jdelvare@...e.com>,
        Zhang Rui <rui.zhang@...el.com>,
        Eduardo Valentin <edubezval@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        kernel-team@...roid.com, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        "Rafael J . Wysocki" <rafael@...nel.org>
Subject: Re: [PATCH 4.19 v1 1/2] hwmon: Introduce
 hwmon_device_register_for_thermal

On 06/29/2022, Guenter Roeck wrote:
> On 6/29/22 15:58, Will McVicker wrote:
> > From: Guenter Roeck <linux@...ck-us.net>
> > 
> > [ upstream commit e5d21072054fbadf41cd56062a3a14e447e8c22b ]
> > 
> > The thermal subsystem registers a hwmon driver without providing
> > chip or sysfs group information. This is for legacy reasons and
> > would be difficult to change. At the same time, we want to enforce
> > that chip information is provided when registering a hwmon device
> > using hwmon_device_register_with_info(). To enable this, introduce
> > a special API for use only by the thermal subsystem.
> > 
> > Acked-by: Rafael J . Wysocki <rafael@...nel.org>
> > Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> 
> NACK. The patch introducing the problem needs to be reverted.

I'm fine with that as well. I've already verified that fixes the issue. I'll go
ahead and send the revert.

Thanks,
Will

> 
> Guenter
> 
> > ---
> >   drivers/hwmon/hwmon.c | 25 +++++++++++++++++++++++++
> >   include/linux/hwmon.h |  3 +++
> >   2 files changed, 28 insertions(+)
> > 
> > diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c
> > index c4051a3e63c2..412a5e39fc14 100644
> > --- a/drivers/hwmon/hwmon.c
> > +++ b/drivers/hwmon/hwmon.c
> > @@ -725,6 +725,31 @@ hwmon_device_register_with_info(struct device *dev, const char *name,
> >   }
> >   EXPORT_SYMBOL_GPL(hwmon_device_register_with_info);
> > +/**
> > + * hwmon_device_register_for_thermal - register hwmon device for thermal subsystem
> > + * @dev: the parent device
> > + * @name: hwmon name attribute
> > + * @drvdata: driver data to attach to created device
> > + *
> > + * The use of this function is restricted. It is provided for legacy reasons
> > + * and must only be called from the thermal subsystem.
> > + *
> > + * hwmon_device_unregister() must be called when the device is no
> > + * longer needed.
> > + *
> > + * Returns the pointer to the new device.
> > + */
> > +struct device *
> > +hwmon_device_register_for_thermal(struct device *dev, const char *name,
> > +				  void *drvdata)
> > +{
> > +	if (!name || !dev)
> > +		return ERR_PTR(-EINVAL);
> > +
> > +	return __hwmon_device_register(dev, name, drvdata, NULL, NULL);
> > +}
> > +EXPORT_SYMBOL_GPL(hwmon_device_register_for_thermal);
> > +
> >   /**
> >    * hwmon_device_register - register w/ hwmon
> >    * @dev: the device to register
> > diff --git a/include/linux/hwmon.h b/include/linux/hwmon.h
> > index 8fde789f2eff..5ff3db6eb9f1 100644
> > --- a/include/linux/hwmon.h
> > +++ b/include/linux/hwmon.h
> > @@ -390,6 +390,9 @@ hwmon_device_register_with_info(struct device *dev,
> >   				const struct hwmon_chip_info *info,
> >   				const struct attribute_group **extra_groups);
> >   struct device *
> > +hwmon_device_register_for_thermal(struct device *dev, const char *name,
> > +				  void *drvdata);
> > +struct device *
> >   devm_hwmon_device_register_with_info(struct device *dev,
> >   				const char *name, void *drvdata,
> >   				const struct hwmon_chip_info *info,
>