linux-kernel - Re: [PATCH v2 01/17] thermal: add thermal_zone_set

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Date:   Tue, 6 Nov 2018 17:11:23 +0100
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     Zhang Rui <rui.zhang@...el.com>,
        Eduardo Valentin <edubezval@...il.com>
Cc:     Amit kucheria <amit.kucheria@...aro.org>,
        Eric Anholt <eric@...olt.net>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Markus Mayer <mmayer@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Heiko Stuebner <heiko@...ech.de>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Keerthy <j-keerthy@...com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Jun Nie <jun.nie@...aro.org>,
        Baoyou Xie <baoyou.xie@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 01/17] thermal: add thermal_zone_set_mode() helper


On 11/06/2018 09:11 AM, Zhang Rui wrote:
> On 三, 2018-10-17 at 17:52 +0200, Bartlomiej Zolnierkiewicz wrote:
>> In order to remove the code duplication and prepare for further
>> changes:
>>
>> * Add thermal_zone_set_mode() helper. Then update core code and
>>   drivers to use it.
>>
>> There should be no functional changes caused by this patch.
>>
>> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
>> ---
>>  drivers/thermal/hisi_thermal.c     | 14 ++------------
>>  drivers/thermal/of-thermal.c       |  3 ++-
>>  drivers/thermal/rockchip_thermal.c | 26 +++++++++-----------------
>>  drivers/thermal/thermal_helpers.c  | 14 ++++++++++++++
>>  drivers/thermal/thermal_sysfs.c    |  8 +++++---
>>  include/linux/thermal.h            |  5 +++++
>>  6 files changed, 37 insertions(+), 33 deletions(-)
>>
>>  
>>  
>> diff --git a/drivers/thermal/thermal_helpers.c
>> b/drivers/thermal/thermal_helpers.c
>> index 2ba756a..b18cee2 100644
>> --- a/drivers/thermal/thermal_helpers.c
>> +++ b/drivers/thermal/thermal_helpers.c
>> @@ -224,3 +224,17 @@ int thermal_zone_get_offset(struct
>> thermal_zone_device *tz)
>>  	return 0;
>>  }
>>  EXPORT_SYMBOL_GPL(thermal_zone_get_offset);
>> +
>> +/**
>> + * thermal_zone_set_mode() - sets mode of thermal zone device
>> + * @tz: a valid pointer to a struct thermal_zone_device
>> + * @mode: mode to be set
>> + *
>> + * Return: On success returns 0, an error code otherwise.
>> + */
>> +int thermal_zone_set_mode(struct thermal_zone_device *tz,
>> +			  enum thermal_device_mode mode)
>> +{
>> +	return tz->ops->set_mode(tz, mode);
> 
> better to check tz->ops->set_mode first.

I think that it should be added incrementally later when needed.

We don't do 'defensive coding' in the kernel and in this patchset
thermal_zone_set_mode() is not used in any place which has not used
->set_mode directly previously (actually patches #1-4 should not
cause any functionality changes as noted in patch descriptions).

> thanks,
> rui
>> +}
>> +EXPORT_SYMBOL_GPL(thermal_zone_set_mode);
>> diff --git a/drivers/thermal/thermal_sysfs.c
>> b/drivers/thermal/thermal_sysfs.c
>> index 2241cea..2e9e762 100644
>> --- a/drivers/thermal/thermal_sysfs.c
>> +++ b/drivers/thermal/thermal_sysfs.c
>> @@ -69,17 +69,19 @@
>>  {
>>  	struct thermal_zone_device *tz = to_thermal_zone(dev);
>>  	int result;
>> +	enum thermal_device_mode mode;
>>  
>>  	if (!tz->ops->set_mode)
>>  		return -EPERM;
>>  
>>  	if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
>> -		result = tz->ops->set_mode(tz,
>> THERMAL_DEVICE_ENABLED);
>> +		mode = THERMAL_DEVICE_ENABLED;
>>  	else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
>> -		result = tz->ops->set_mode(tz,
>> THERMAL_DEVICE_DISABLED);
>> +		mode = THERMAL_DEVICE_DISABLED;
>>  	else
>> -		result = -EINVAL;
>> +		return -EINVAL;
>>  
>> +	result = thermal_zone_set_mode(tz, mode);
>>  	if (result)
>>  		return result;
>>  
>> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
>> index 5f4705f..9d21fd1 100644
>> --- a/include/linux/thermal.h
>> +++ b/include/linux/thermal.h
>> @@ -452,6 +452,8 @@ struct thermal_cooling_device *
>>  int thermal_zone_get_temp(struct thermal_zone_device *tz, int
>> *temp);
>>  int thermal_zone_get_slope(struct thermal_zone_device *tz);
>>  int thermal_zone_get_offset(struct thermal_zone_device *tz);
>> +int thermal_zone_set_mode(struct thermal_zone_device *tz,
>> +			  enum thermal_device_mode mode);
>>  
>>  int get_tz_trend(struct thermal_zone_device *, int);
>>  struct thermal_instance *get_thermal_instance(struct
>> thermal_zone_device *,
>> @@ -518,6 +520,9 @@ static inline int thermal_zone_get_slope(
>>  static inline int thermal_zone_get_offset(
>>  		struct thermal_zone_device *tz)
>>  { return -ENODEV; }
>> +static inline int thermal_zone_set_mode(
>> +		struct thermal_zone_device *tz, enum
>> thermal_device_mode mode)
>> +{ return -ENODEV; }
>>  static inline int get_tz_trend(struct thermal_zone_device *tz, int
>> trip)
>>  { return -ENODEV; }
>>  static inline struct thermal_instance *

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics