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Subject: Re: [PATCH v4 05/11] thermal: remove get_mode() operation of
 drivers
To:     Andrzej Pietrasiewicz <andrzej.p@collabora.com>
Cc:     linux-pm@vger.kernel.org, linux-acpi@vger.kernel.org,
        netdev@vger.kernel.org, linux-wireless@vger.kernel.org,
        platform-driver-x86@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-renesas-soc@vger.kernel.org,
        linux-rockchip@lists.infradead.org,
        "Rafael J . Wysocki" <rjw@rjwysocki.net>,
        Len Brown <lenb@kernel.org>,
        Vishal Kulkarni <vishal@chelsio.com>,
        "David S . Miller" <davem@davemloft.net>,
        Jiri Pirko <jiri@mellanox.com>,
        Ido Schimmel <idosch@mellanox.com>,
        Johannes Berg <johannes.berg@intel.com>,
        Emmanuel Grumbach <emmanuel.grumbach@intel.com>,
        Luca Coelho <luciano.coelho@intel.com>,
        Intel Linux Wireless <linuxwifi@intel.com>,
        Kalle Valo <kvalo@codeaurora.org>,
        Peter Kaestle <peter@piie.net>,
        Darren Hart <dvhart@infradead.org>,
        Andy Shevchenko <andy@infradead.org>,
        Sebastian Reichel <sre@kernel.org>,
        Miquel Raynal <miquel.raynal@bootlin.com>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Amit Kucheria <amit.kucheria@verdurent.com>,
        Support Opensource <support.opensource@diasemi.com>,
        Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        Fabio Estevam <festevam@gmail.com>,
        NXP Linux Team <linux-imx@nxp.com>,
        =?UTF-8?Q?Niklas_S=c3=b6derlund?= <niklas.soderlund@ragnatech.se>,
        Heiko Stuebner <heiko@sntech.de>,
        Orson Zhai <orsonzhai@gmail.com>,
        Baolin Wang <baolin.wang7@gmail.com>,
        Chunyan Zhang <zhang.lyra@gmail.com>,
        Zhang Rui <rui.zhang@intel.com>,
        Allison Randal <allison@lohutok.net>,
        Enrico Weigelt <info@metux.net>,
        Gayatri Kammela <gayatri.kammela@intel.com>,
        Thomas Gleixner <tglx@linutronix.de>, kernel@collabora.com
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Message-ID: <e63bdfa3-6a5a-d639-8c89-77d58a5893b9@samsung.com>
Date:   Wed, 24 Jun 2020 11:47:30 +0200
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References: <Message-ID: <4493c0e4-51aa-3907-810c-74949ff27ca4@samsung.com>
        <20200528192051.28034-1-andrzej.p@collabora.com>
        <CGME20200528192201eucas1p2ce18c3d5db59b142751b26e24a146e0b@eucas1p2.samsung.com>
        <20200528192051.28034-6-andrzej.p@collabora.com>
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On 5/28/20 9:20 PM, Andrzej Pietrasiewicz wrote:
> get_mode() is now redundant, as the state is stored in struct
> thermal_zone_device.
> 
> Consequently the "mode" attribute in sysfs can always be visible, because
> it is always possible to get the mode from struct tzd.
> 
> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>

The side-effect of splitting the v3 is that some devices will be
marked in sysfs as disabled (however they are in reality enabled)
after applying this patch (it gets fixed by patch #08).

I think that we can live with that so:

Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

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

> ---
>  drivers/acpi/thermal.c                        |  9 ------
>  .../ethernet/mellanox/mlxsw/core_thermal.c    | 19 ------------
>  drivers/platform/x86/acerhdf.c                | 12 --------
>  drivers/thermal/da9062-thermal.c              |  8 -----
>  drivers/thermal/imx_thermal.c                 |  9 ------
>  .../intel/int340x_thermal/int3400_thermal.c   |  9 ------
>  .../thermal/intel/intel_quark_dts_thermal.c   |  8 -----
>  drivers/thermal/thermal_core.c                |  7 +----
>  drivers/thermal/thermal_of.c                  |  9 ------
>  drivers/thermal/thermal_sysfs.c               | 30 ++-----------------
>  include/linux/thermal.h                       |  2 --
>  11 files changed, 3 insertions(+), 119 deletions(-)
> 
> diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
> index 4ba273f49d87..592be97c4456 100644
> --- a/drivers/acpi/thermal.c
> +++ b/drivers/acpi/thermal.c
> @@ -525,14 +525,6 @@ static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
>  	return 0;
>  }
>  
> -static int thermal_get_mode(struct thermal_zone_device *thermal,
> -				enum thermal_device_mode *mode)
> -{
> -	*mode = thermal->mode;
> -
> -	return 0;
> -}
> -
>  static int thermal_set_mode(struct thermal_zone_device *thermal,
>  				enum thermal_device_mode mode)
>  {
> @@ -847,7 +839,6 @@ static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
>  	.bind = acpi_thermal_bind_cooling_device,
>  	.unbind	= acpi_thermal_unbind_cooling_device,
>  	.get_temp = thermal_get_temp,
> -	.get_mode = thermal_get_mode,
>  	.set_mode = thermal_set_mode,
>  	.get_trip_type = thermal_get_trip_type,
>  	.get_trip_temp = thermal_get_trip_temp,
> diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
> index aa082e8a0b13..6e26678ac312 100644
> --- a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
> +++ b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
> @@ -275,14 +275,6 @@ static int mlxsw_thermal_unbind(struct thermal_zone_device *tzdev,
>  	return 0;
>  }
>  
> -static int mlxsw_thermal_get_mode(struct thermal_zone_device *tzdev,
> -				  enum thermal_device_mode *mode)
> -{
> -	*mode = tzdev->mode;
> -
> -	return 0;
> -}
> -
>  static int mlxsw_thermal_set_mode(struct thermal_zone_device *tzdev,
>  				  enum thermal_device_mode mode)
>  {
> @@ -403,7 +395,6 @@ static int mlxsw_thermal_trend_get(struct thermal_zone_device *tzdev,
>  static struct thermal_zone_device_ops mlxsw_thermal_ops = {
>  	.bind = mlxsw_thermal_bind,
>  	.unbind = mlxsw_thermal_unbind,
> -	.get_mode = mlxsw_thermal_get_mode,
>  	.set_mode = mlxsw_thermal_set_mode,
>  	.get_temp = mlxsw_thermal_get_temp,
>  	.get_trip_type	= mlxsw_thermal_get_trip_type,
> @@ -462,14 +453,6 @@ static int mlxsw_thermal_module_unbind(struct thermal_zone_device *tzdev,
>  	return err;
>  }
>  
> -static int mlxsw_thermal_module_mode_get(struct thermal_zone_device *tzdev,
> -					 enum thermal_device_mode *mode)
> -{
> -	*mode = tzdev->mode;
> -
> -	return 0;
> -}
> -
>  static int mlxsw_thermal_module_mode_set(struct thermal_zone_device *tzdev,
>  					 enum thermal_device_mode mode)
>  {
> @@ -591,7 +574,6 @@ mlxsw_thermal_module_trip_hyst_set(struct thermal_zone_device *tzdev, int trip,
>  static struct thermal_zone_device_ops mlxsw_thermal_module_ops = {
>  	.bind		= mlxsw_thermal_module_bind,
>  	.unbind		= mlxsw_thermal_module_unbind,
> -	.get_mode	= mlxsw_thermal_module_mode_get,
>  	.set_mode	= mlxsw_thermal_module_mode_set,
>  	.get_temp	= mlxsw_thermal_module_temp_get,
>  	.get_trip_type	= mlxsw_thermal_module_trip_type_get,
> @@ -630,7 +612,6 @@ static int mlxsw_thermal_gearbox_temp_get(struct thermal_zone_device *tzdev,
>  static struct thermal_zone_device_ops mlxsw_thermal_gearbox_ops = {
>  	.bind		= mlxsw_thermal_module_bind,
>  	.unbind		= mlxsw_thermal_module_unbind,
> -	.get_mode	= mlxsw_thermal_module_mode_get,
>  	.set_mode	= mlxsw_thermal_module_mode_set,
>  	.get_temp	= mlxsw_thermal_gearbox_temp_get,
>  	.get_trip_type	= mlxsw_thermal_module_trip_type_get,
> diff --git a/drivers/platform/x86/acerhdf.c b/drivers/platform/x86/acerhdf.c
> index 97b288485837..32c5fe16b7f7 100644
> --- a/drivers/platform/x86/acerhdf.c
> +++ b/drivers/platform/x86/acerhdf.c
> @@ -413,17 +413,6 @@ static inline void acerhdf_enable_kernelmode(void)
>  	pr_notice("kernel mode fan control ON\n");
>  }
>  
> -static int acerhdf_get_mode(struct thermal_zone_device *thermal,
> -			    enum thermal_device_mode *mode)
> -{
> -	if (verbose)
> -		pr_notice("kernel mode fan control %d\n", kernelmode);
> -
> -	*mode = thermal->mode;
> -
> -	return 0;
> -}
> -
>  /*
>   * set operation mode;
>   * enabled: the thermal layer of the kernel takes care about
> @@ -490,7 +479,6 @@ static struct thermal_zone_device_ops acerhdf_dev_ops = {
>  	.bind = acerhdf_bind,
>  	.unbind = acerhdf_unbind,
>  	.get_temp = acerhdf_get_ec_temp,
> -	.get_mode = acerhdf_get_mode,
>  	.set_mode = acerhdf_set_mode,
>  	.get_trip_type = acerhdf_get_trip_type,
>  	.get_trip_hyst = acerhdf_get_trip_hyst,
> diff --git a/drivers/thermal/da9062-thermal.c b/drivers/thermal/da9062-thermal.c
> index a14c7981c7c7..a7ac8afb063e 100644
> --- a/drivers/thermal/da9062-thermal.c
> +++ b/drivers/thermal/da9062-thermal.c
> @@ -120,13 +120,6 @@ static irqreturn_t da9062_thermal_irq_handler(int irq, void *data)
>  	return IRQ_HANDLED;
>  }
>  
> -static int da9062_thermal_get_mode(struct thermal_zone_device *z,
> -				   enum thermal_device_mode *mode)
> -{
> -	*mode = z->mode;
> -	return 0;
> -}
> -
>  static int da9062_thermal_get_trip_type(struct thermal_zone_device *z,
>  					int trip,
>  					enum thermal_trip_type *type)
> @@ -179,7 +172,6 @@ static int da9062_thermal_get_temp(struct thermal_zone_device *z,
>  
>  static struct thermal_zone_device_ops da9062_thermal_ops = {
>  	.get_temp	= da9062_thermal_get_temp,
> -	.get_mode	= da9062_thermal_get_mode,
>  	.get_trip_type	= da9062_thermal_get_trip_type,
>  	.get_trip_temp	= da9062_thermal_get_trip_temp,
>  };
> diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c
> index 9a1114d721b6..2c7ee5da608a 100644
> --- a/drivers/thermal/imx_thermal.c
> +++ b/drivers/thermal/imx_thermal.c
> @@ -330,14 +330,6 @@ static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
>  	return 0;
>  }
>  
> -static int imx_get_mode(struct thermal_zone_device *tz,
> -			enum thermal_device_mode *mode)
> -{
> -	*mode = tz->mode;
> -
> -	return 0;
> -}
> -
>  static int imx_set_mode(struct thermal_zone_device *tz,
>  			enum thermal_device_mode mode)
>  {
> @@ -464,7 +456,6 @@ static struct thermal_zone_device_ops imx_tz_ops = {
>  	.bind = imx_bind,
>  	.unbind = imx_unbind,
>  	.get_temp = imx_get_temp,
> -	.get_mode = imx_get_mode,
>  	.set_mode = imx_set_mode,
>  	.get_trip_type = imx_get_trip_type,
>  	.get_trip_temp = imx_get_trip_temp,
> diff --git a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> index f65b2fc09198..9a622aaf29dd 100644
> --- a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> +++ b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> @@ -377,14 +377,6 @@ static int int3400_thermal_get_temp(struct thermal_zone_device *thermal,
>  	return 0;
>  }
>  
> -static int int3400_thermal_get_mode(struct thermal_zone_device *thermal,
> -				enum thermal_device_mode *mode)
> -{
> -	*mode = thermal->mode;
> -
> -	return 0;
> -}
> -
>  static int int3400_thermal_set_mode(struct thermal_zone_device *thermal,
>  				enum thermal_device_mode mode)
>  {
> @@ -412,7 +404,6 @@ static int int3400_thermal_set_mode(struct thermal_zone_device *thermal,
>  
>  static struct thermal_zone_device_ops int3400_thermal_ops = {
>  	.get_temp = int3400_thermal_get_temp,
> -	.get_mode = int3400_thermal_get_mode,
>  	.set_mode = int3400_thermal_set_mode,
>  };
>  
> diff --git a/drivers/thermal/intel/intel_quark_dts_thermal.c b/drivers/thermal/intel/intel_quark_dts_thermal.c
> index d77cb3df5ade..c4879b4bfbf1 100644
> --- a/drivers/thermal/intel/intel_quark_dts_thermal.c
> +++ b/drivers/thermal/intel/intel_quark_dts_thermal.c
> @@ -308,13 +308,6 @@ static int sys_get_curr_temp(struct thermal_zone_device *tzd,
>  	return 0;
>  }
>  
> -static int sys_get_mode(struct thermal_zone_device *tzd,
> -				enum thermal_device_mode *mode)
> -{
> -	*mode = tzd->mode;
> -	return 0;
> -}
> -
>  static int sys_set_mode(struct thermal_zone_device *tzd,
>  				enum thermal_device_mode mode)
>  {
> @@ -336,7 +329,6 @@ static struct thermal_zone_device_ops tzone_ops = {
>  	.get_trip_type = sys_get_trip_type,
>  	.set_trip_temp = sys_set_trip_temp,
>  	.get_crit_temp = sys_get_crit_temp,
> -	.get_mode = sys_get_mode,
>  	.set_mode = sys_set_mode,
>  };
>  
> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
> index b71196eaf90e..14d3b1b94c4f 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -1456,7 +1456,6 @@ static int thermal_pm_notify(struct notifier_block *nb,
>  			     unsigned long mode, void *_unused)
>  {
>  	struct thermal_zone_device *tz;
> -	enum thermal_device_mode tz_mode;
>  
>  	switch (mode) {
>  	case PM_HIBERNATION_PREPARE:
> @@ -1469,11 +1468,7 @@ static int thermal_pm_notify(struct notifier_block *nb,
>  	case PM_POST_SUSPEND:
>  		atomic_set(&in_suspend, 0);
>  		list_for_each_entry(tz, &thermal_tz_list, node) {
> -			tz_mode = THERMAL_DEVICE_ENABLED;
> -			if (tz->ops->get_mode)
> -				tz->ops->get_mode(tz, &tz_mode);
> -
> -			if (tz_mode == THERMAL_DEVICE_DISABLED)
> +			if (tz->mode == THERMAL_DEVICE_DISABLED)
>  				continue;
>  
>  			thermal_zone_device_init(tz);
> diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
> index c495b1e48ef2..ba65d48a48cb 100644
> --- a/drivers/thermal/thermal_of.c
> +++ b/drivers/thermal/thermal_of.c
> @@ -267,14 +267,6 @@ static int of_thermal_unbind(struct thermal_zone_device *thermal,
>  	return 0;
>  }
>  
> -static int of_thermal_get_mode(struct thermal_zone_device *tz,
> -			       enum thermal_device_mode *mode)
> -{
> -	*mode = tz->mode;
> -
> -	return 0;
> -}
> -
>  static int of_thermal_set_mode(struct thermal_zone_device *tz,
>  			       enum thermal_device_mode mode)
>  {
> @@ -389,7 +381,6 @@ static int of_thermal_get_crit_temp(struct thermal_zone_device *tz,
>  }
>  
>  static struct thermal_zone_device_ops of_thermal_ops = {
> -	.get_mode = of_thermal_get_mode,
>  	.set_mode = of_thermal_set_mode,
>  
>  	.get_trip_type = of_thermal_get_trip_type,
> diff --git a/drivers/thermal/thermal_sysfs.c b/drivers/thermal/thermal_sysfs.c
> index aa99edb4dff7..096370977068 100644
> --- a/drivers/thermal/thermal_sysfs.c
> +++ b/drivers/thermal/thermal_sysfs.c
> @@ -49,18 +49,9 @@ static ssize_t
>  mode_show(struct device *dev, struct device_attribute *attr, char *buf)
>  {
>  	struct thermal_zone_device *tz = to_thermal_zone(dev);
> -	enum thermal_device_mode mode;
> -	int result;
> -
> -	if (!tz->ops->get_mode)
> -		return -EPERM;
>  
> -	result = tz->ops->get_mode(tz, &mode);
> -	if (result)
> -		return result;
> -
> -	return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
> -		       : "disabled");
> +	return sprintf(buf, "%s\n", tz->mode == THERMAL_DEVICE_ENABLED ?
> +		       "enabled" : "disabled");
>  }
>  
>  static ssize_t
> @@ -428,30 +419,13 @@ static struct attribute_group thermal_zone_attribute_group = {
>  	.attrs = thermal_zone_dev_attrs,
>  };
>  
> -/* We expose mode only if .get_mode is present */
>  static struct attribute *thermal_zone_mode_attrs[] = {
>  	&dev_attr_mode.attr,
>  	NULL,
>  };
>  
> -static umode_t thermal_zone_mode_is_visible(struct kobject *kobj,
> -					    struct attribute *attr,
> -					    int attrno)
> -{
> -	struct device *dev = container_of(kobj, struct device, kobj);
> -	struct thermal_zone_device *tz;
> -
> -	tz = container_of(dev, struct thermal_zone_device, device);
> -
> -	if (tz->ops->get_mode)
> -		return attr->mode;
> -
> -	return 0;
> -}
> -
>  static struct attribute_group thermal_zone_mode_attribute_group = {
>  	.attrs = thermal_zone_mode_attrs,
> -	.is_visible = thermal_zone_mode_is_visible,
>  };
>  
>  /* We expose passive only if passive trips are present */
> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> index 5f91d7f04512..a808f6fa2777 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -76,8 +76,6 @@ struct thermal_zone_device_ops {
>  		       struct thermal_cooling_device *);
>  	int (*get_temp) (struct thermal_zone_device *, int *);
>  	int (*set_trips) (struct thermal_zone_device *, int, int);
> -	int (*get_mode) (struct thermal_zone_device *,
> -			 enum thermal_device_mode *);
>  	int (*set_mode) (struct thermal_zone_device *,
>  		enum thermal_device_mode);
>  	int (*get_trip_type) (struct thermal_zone_device *, int,
>