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From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Linux PM <linux-pm@vger.kernel.org>
Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>, Daniel Lezcano <daniel.lezcano@linaro.org>, Zhang Rui <rui.zhang@intel.com>, Linux ACPI <linux-acpi@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>, Lukasz Luba <lukasz.luba@arm.com>
Subject: [PATCH v1 6/6] thermal: netlink: Rework cdev-related notify API
Date: Fri, 15 Dec 2023 21:02:04 +0100
Message-ID: <7628882.EvYhyI6sBW@kreacher>
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From: Rafael J. Wysocki <rafael.j.wysocki@intel.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.

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@intel.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)
 {