linux-kernel - Re: [PATCH v1 6/6] thermal: netlink: Rework cdev-related notify API

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Message-ID: <13835e24-1042-41e4-9a3c-dd0adf3462ca@linaro.org>
Date: Tue, 9 Jan 2024 12:36:26 +0100
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>,
 Linux PM <linux-pm@...r.kernel.org>
Cc: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
 Zhang Rui <rui.zhang@...el.com>, Linux ACPI <linux-acpi@...r.kernel.org>,
 LKML <linux-kernel@...r.kernel.org>, Lukasz Luba <lukasz.luba@....com>
Subject: Re: [PATCH v1 6/6] thermal: netlink: Rework cdev-related notify API

On 15/12/2023 21:02, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> The only actually used thermal netlink notification routine related
> to cooling devices is thermal_notify_cdev_state_update().  The other
> two, thermal_notify_cdev_add() and thermal_notify_cdev_delete(), are
> never used.

I think it is an oversight. These should be called in 
thermal_cooling_device_[un]register()


> So as to get rid of dead code, drop thermal_notify_cdev_add/delete(),
> which can be added back if they turn out to be ever needed, along with
> the related code.
> 
> In analogy with the previous thermal netlink API changes, redefine
> thermal_notify_cdev_state_update() to take a const cdev pointer as its
> first argument and let it extract the requisite information from there
> by itself.
> 
> No intentional functional impact.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
>   drivers/thermal/thermal_helpers.c |    2 -
>   drivers/thermal/thermal_netlink.c |   43 ++------------------------------------
>   drivers/thermal/thermal_netlink.h |   19 +++-------------
>   3 files changed, 8 insertions(+), 56 deletions(-)
> 
> Index: linux-pm/drivers/thermal/thermal_netlink.h
> ===================================================================
> --- linux-pm.orig/drivers/thermal/thermal_netlink.h
> +++ linux-pm/drivers/thermal/thermal_netlink.h
> @@ -24,9 +24,8 @@ int thermal_notify_tz_trip_up(const stru
>   			      const struct thermal_trip *trip);
>   int thermal_notify_tz_trip_change(const struct thermal_zone_device *tz,
>   				  const struct thermal_trip *trip);
> -int thermal_notify_cdev_state_update(int cdev_id, int state);
> -int thermal_notify_cdev_add(int cdev_id, const char *name, int max_state);
> -int thermal_notify_cdev_delete(int cdev_id);
> +int thermal_notify_cdev_state_update(const struct thermal_cooling_device *cdev,
> +				     int state);
>   int thermal_notify_tz_gov_change(const struct thermal_zone_device *tz,
>   				 const char *name);
>   int thermal_genl_sampling_temp(int id, int temp);
> @@ -76,18 +75,8 @@ static inline int thermal_notify_tz_trip
>   	return 0;
>   }
>   
> -static inline int thermal_notify_cdev_state_update(int cdev_id, int state)
> -{
> -	return 0;
> -}
> -
> -static inline int thermal_notify_cdev_add(int cdev_id, const char *name,
> -					  int max_state)
> -{
> -	return 0;
> -}
> -
> -static inline int thermal_notify_cdev_delete(int cdev_id)
> +static inline int thermal_notify_cdev_state_update(const struct thermal_cooling_device *cdev,
> +						   int state)
>   {
>   	return 0;
>   }
> Index: linux-pm/drivers/thermal/thermal_helpers.c
> ===================================================================
> --- linux-pm.orig/drivers/thermal/thermal_helpers.c
> +++ linux-pm/drivers/thermal/thermal_helpers.c
> @@ -152,7 +152,7 @@ static void thermal_cdev_set_cur_state(s
>   	if (cdev->ops->set_cur_state(cdev, target))
>   		return;
>   
> -	thermal_notify_cdev_state_update(cdev->id, target);
> +	thermal_notify_cdev_state_update(cdev, target);
>   	thermal_cooling_device_stats_update(cdev, target);
>   }
>   
> Index: linux-pm/drivers/thermal/thermal_netlink.c
> ===================================================================
> --- linux-pm.orig/drivers/thermal/thermal_netlink.c
> +++ linux-pm/drivers/thermal/thermal_netlink.c
> @@ -147,27 +147,6 @@ static int thermal_genl_event_tz_trip_ch
>   	return 0;
>   }
>   
> -static int thermal_genl_event_cdev_add(struct param *p)
> -{
> -	if (nla_put_string(p->msg, THERMAL_GENL_ATTR_CDEV_NAME,
> -			   p->name) ||
> -	    nla_put_u32(p->msg, THERMAL_GENL_ATTR_CDEV_ID,
> -			p->cdev_id) ||
> -	    nla_put_u32(p->msg, THERMAL_GENL_ATTR_CDEV_MAX_STATE,
> -			p->cdev_max_state))
> -		return -EMSGSIZE;
> -
> -	return 0;
> -}
> -
> -static int thermal_genl_event_cdev_delete(struct param *p)
> -{
> -	if (nla_put_u32(p->msg, THERMAL_GENL_ATTR_CDEV_ID, p->cdev_id))
> -		return -EMSGSIZE;
> -
> -	return 0;
> -}
> -
>   static int thermal_genl_event_cdev_state_update(struct param *p)
>   {
>   	if (nla_put_u32(p->msg, THERMAL_GENL_ATTR_CDEV_ID,
> @@ -244,8 +223,6 @@ static cb_t event_cb[] = {
>   	[THERMAL_GENL_EVENT_TZ_TRIP_UP]		= thermal_genl_event_tz_trip_up,
>   	[THERMAL_GENL_EVENT_TZ_TRIP_DOWN]	= thermal_genl_event_tz_trip_down,
>   	[THERMAL_GENL_EVENT_TZ_TRIP_CHANGE]	= thermal_genl_event_tz_trip_change,
> -	[THERMAL_GENL_EVENT_CDEV_ADD]		= thermal_genl_event_cdev_add,
> -	[THERMAL_GENL_EVENT_CDEV_DELETE]	= thermal_genl_event_cdev_delete,
>   	[THERMAL_GENL_EVENT_CDEV_STATE_UPDATE]	= thermal_genl_event_cdev_state_update,
>   	[THERMAL_GENL_EVENT_TZ_GOV_CHANGE]	= thermal_genl_event_gov_change,
>   	[THERMAL_GENL_EVENT_CPU_CAPABILITY_CHANGE] = thermal_genl_event_cpu_capability_change,
> @@ -348,28 +325,14 @@ int thermal_notify_tz_trip_change(const
>   	return thermal_genl_send_event(THERMAL_GENL_EVENT_TZ_TRIP_CHANGE, &p);
>   }
>   
> -int thermal_notify_cdev_state_update(int cdev_id, int cdev_state)
> +int thermal_notify_cdev_state_update(const struct thermal_cooling_device *cdev,
> +				     int state)
>   {
> -	struct param p = { .cdev_id = cdev_id, .cdev_state = cdev_state };
> +	struct param p = { .cdev_id = cdev->id, .cdev_state = state };
>   
>   	return thermal_genl_send_event(THERMAL_GENL_EVENT_CDEV_STATE_UPDATE, &p);
>   }
>   
> -int thermal_notify_cdev_add(int cdev_id, const char *name, int cdev_max_state)
> -{
> -	struct param p = { .cdev_id = cdev_id, .name = name,
> -			   .cdev_max_state = cdev_max_state };
> -
> -	return thermal_genl_send_event(THERMAL_GENL_EVENT_CDEV_ADD, &p);
> -}
> -
> -int thermal_notify_cdev_delete(int cdev_id)
> -{
> -	struct param p = { .cdev_id = cdev_id };
> -
> -	return thermal_genl_send_event(THERMAL_GENL_EVENT_CDEV_DELETE, &p);
> -}
> -
>   int thermal_notify_tz_gov_change(const struct thermal_zone_device *tz,
>   				 const char *name)
>   {
> 
> 
> 

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