[PATCH v2 0/6] thermal: Store trips table and ops in thermal_zone_device

[PATCH v2 0/6] thermal: Store trips table and ops in thermal_zone_device

[Rafael J. Wysocki]

Hi Everyone,

This is an update of

https://lore.kernel.org/linux-pm/2728491.mvXUDI8C0e@kreacher/

that has been rebased on top of

https://lore.kernel.org/linux-pm/6017196.lOV4Wx5bFT@kreacher/

and includes some bug fixes.

The original series description still applies:

"This series changes the PM core to copy the trips and zone ops directly
 into struct thermal_zone_device so as to allow the callers of the zone
 registration function to discard their own copies of those things after
 zone registration and/or possibly allocate them as read-only.

 The first patch makes the thermal core create a copy of the trips table which
 is declared as a flex array to enable additional bounds checking on it.  The
 next two patches update the ACPI thermal driver and Intel thermal drivers to
 take benefit of that change.

 In a similar pattern, patch [4/6] makes the thermal core create an internal
 copy of the zone ops supplied by the zone creator, so as to allow the
 original ops structure to be discarded after zone registration or allocated
 as read-only, and the next two patches update the ACPI thermal driver and Intel
 thermal drivers to actually do that.

 The other thermal drivers need not be changed, although in principle they may
 be simplified a bit too in the future.

 As usual, please refer to the individual patch changelogs for details."

However, the imx thermal driver is modified by patch [1/6], because it uses its
local trips table and expects it to contain the current passive trip temperature
value (as set via sysfs), and the thermal_of driver is modified by patch [4/6],
because it uses the ops pointer from the thermal zone device to free the ops.

Thanks!

[PATCH v2 1/6] thermal: core: Store zone trips table in struct thermal_zone_device

[Rafael J. Wysocki]

From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

The current code expects thermal zone creators to pass a pointer to a
writable trips table to thermal_zone_device_register_with_trips() and
that trips table is then used by the thermal core going forward.

Consequently, the callers of thermal_zone_device_register_with_trips()
are required to hold on to the trips table passed to it until the given
thermal zone is unregistered, at which point the trips table can be
freed, but at the same time they are not expected to access that table
directly.  This is both error prone and confusing.

To address it, turn the trips table pointer in struct thermal_zone_device
into a flex array (counted by its num_trips field), allocate it during
thermal zone device allocation and copy the contents of the trips table
supplied by the zone creator (which can be const now) into it, which
will allow the callers of thermal_zone_device_register_with_trips() to
drop their trip tables right after the zone registration.

This requires the imx thermal driver to be adjusted to store the new
temperature in its internal trips table in imx_set_trip_temp(), because
it will be separate from the core's trips table now and it has to be
explicitly kept in sync with the latter.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
---

v1 -> v2:
   * Rebase.
   * Drop all of the redundant trips[] checks against NULL.
   * Add imx change to still allow it to use its local trips table.
   * Add R-by from Stanislaw (which is still applicable IMV).

---
 drivers/thermal/imx_thermal.c  |    1 +
 drivers/thermal/thermal_core.c |   17 ++++++++---------
 drivers/thermal/thermal_trip.c |    2 +-
 include/linux/thermal.h        |   10 +++++-----
 4 files changed, 15 insertions(+), 15 deletions(-)

Index: linux-pm/include/linux/thermal.h
===================================================================
--- linux-pm.orig/include/linux/thermal.h
+++ linux-pm/include/linux/thermal.h
@@ -137,7 +137,6 @@ struct thermal_cooling_device {
  * @trip_hyst_attrs:	attributes for trip points for sysfs: trip hysteresis
  * @mode:		current mode of this thermal zone
  * @devdata:	private pointer for device private data
- * @trips:	an array of struct thermal_trip
  * @num_trips:	number of trip points the thermal zone supports
  * @passive_delay_jiffies: number of jiffies to wait between polls when
  *			performing passive cooling.
@@ -167,6 +166,7 @@ struct thermal_cooling_device {
  * @poll_queue:	delayed work for polling
  * @notify_event: Last notification event
  * @suspended: thermal zone suspend indicator
+ * @trips:	array of struct thermal_trip objects
  */
 struct thermal_zone_device {
 	int id;
@@ -179,7 +179,6 @@ struct thermal_zone_device {
 	struct thermal_attr *trip_hyst_attrs;
 	enum thermal_device_mode mode;
 	void *devdata;
-	struct thermal_trip *trips;
 	int num_trips;
 	unsigned long passive_delay_jiffies;
 	unsigned long polling_delay_jiffies;
@@ -200,10 +199,11 @@ struct thermal_zone_device {
 	struct list_head node;
 	struct delayed_work poll_queue;
 	enum thermal_notify_event notify_event;
+	bool suspended;
 #ifdef CONFIG_THERMAL_DEBUGFS
 	struct thermal_debugfs *debugfs;
 #endif
-	bool suspended;
+	struct thermal_trip trips[] __counted_by(num_trips);
 };
 
 /**
@@ -322,7 +322,7 @@ int thermal_zone_get_crit_temp(struct th
 #ifdef CONFIG_THERMAL
 struct thermal_zone_device *thermal_zone_device_register_with_trips(
 					const char *type,
-					struct thermal_trip *trips,
+					const struct thermal_trip *trips,
 					int num_trips, void *devdata,
 					struct thermal_zone_device_ops *ops,
 					const struct thermal_zone_params *tzp,
@@ -381,7 +381,7 @@ void thermal_zone_device_critical(struct
 #else
 static inline struct thermal_zone_device *thermal_zone_device_register_with_trips(
 					const char *type,
-					struct thermal_trip *trips,
+					const struct thermal_trip *trips,
 					int num_trips, void *devdata,
 					struct thermal_zone_device_ops *ops,
 					const struct thermal_zone_params *tzp,
Index: linux-pm/drivers/thermal/thermal_core.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_core.c
+++ linux-pm/drivers/thermal/thermal_core.c
@@ -1227,9 +1227,6 @@ int thermal_zone_get_crit_temp(struct th
 	if (tz->ops->get_crit_temp)
 		return tz->ops->get_crit_temp(tz, temp);
 
-	if (!tz->trips)
-		return -EINVAL;
-
 	mutex_lock(&tz->lock);
 
 	for (i = 0; i < tz->num_trips; i++) {
@@ -1271,10 +1268,12 @@ EXPORT_SYMBOL_GPL(thermal_zone_get_crit_
  * IS_ERR*() helpers.
  */
 struct thermal_zone_device *
-thermal_zone_device_register_with_trips(const char *type, struct thermal_trip *trips, int num_trips,
-					void *devdata, struct thermal_zone_device_ops *ops,
-					const struct thermal_zone_params *tzp, int passive_delay,
-					int polling_delay)
+thermal_zone_device_register_with_trips(const char *type,
+					const struct thermal_trip *trips,
+					int num_trips, void *devdata,
+					struct thermal_zone_device_ops *ops,
+					const struct thermal_zone_params *tzp,
+					int passive_delay, int polling_delay)
 {
 	struct thermal_zone_device *tz;
 	int id;
@@ -1308,7 +1307,7 @@ thermal_zone_device_register_with_trips(
 	if (!thermal_class)
 		return ERR_PTR(-ENODEV);
 
-	tz = kzalloc(sizeof(*tz), GFP_KERNEL);
+	tz = kzalloc(struct_size(tz, trips, num_trips), GFP_KERNEL);
 	if (!tz)
 		return ERR_PTR(-ENOMEM);
 
@@ -1340,7 +1339,7 @@ thermal_zone_device_register_with_trips(
 	tz->ops = ops;
 	tz->device.class = thermal_class;
 	tz->devdata = devdata;
-	tz->trips = trips;
+	memcpy(tz->trips, trips, num_trips * sizeof(*trips));
 	tz->num_trips = num_trips;
 
 	thermal_set_delay_jiffies(&tz->passive_delay_jiffies, passive_delay);
Index: linux-pm/drivers/thermal/imx_thermal.c
===================================================================
--- linux-pm.orig/drivers/thermal/imx_thermal.c
+++ linux-pm/drivers/thermal/imx_thermal.c
@@ -355,6 +355,7 @@ static int imx_set_trip_temp(struct ther
 		return -EINVAL;
 
 	imx_set_alarm_temp(data, temp);
+	trips[IMX_TRIP_PASSIVE].temperature = temp;
 
 	pm_runtime_put(data->dev);
 
Index: linux-pm/drivers/thermal/thermal_trip.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_trip.c
+++ linux-pm/drivers/thermal/thermal_trip.c
@@ -122,7 +122,7 @@ void __thermal_zone_set_trips(struct the
 int __thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
 			    struct thermal_trip *trip)
 {
-	if (!tz || !tz->trips || trip_id < 0 || trip_id >= tz->num_trips || !trip)
+	if (!tz || trip_id < 0 || trip_id >= tz->num_trips || !trip)
 		return -EINVAL;
 
 	*trip = tz->trips[trip_id];

Re: [PATCH v2 1/6] thermal: core: Store zone trips table in struct thermal_zone_device

[Daniel Lezcano]

On 14/02/2024 13:28, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> 
> The current code expects thermal zone creators to pass a pointer to a
> writable trips table to thermal_zone_device_register_with_trips() and
> that trips table is then used by the thermal core going forward.
> 
> Consequently, the callers of thermal_zone_device_register_with_trips()
> are required to hold on to the trips table passed to it until the given
> thermal zone is unregistered, at which point the trips table can be
> freed, but at the same time they are not expected to access that table
> directly.  This is both error prone and confusing.
> 
> To address it, turn the trips table pointer in struct thermal_zone_device
> into a flex array (counted by its num_trips field), allocate it during
> thermal zone device allocation and copy the contents of the trips table
> supplied by the zone creator (which can be const now) into it, which
> will allow the callers of thermal_zone_device_register_with_trips() to
> drop their trip tables right after the zone registration.
> 
> This requires the imx thermal driver to be adjusted to store the new
> temperature in its internal trips table in imx_set_trip_temp(), because
> it will be separate from the core's trips table now and it has to be
> explicitly kept in sync with the latter.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>

Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>


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[PATCH v2.1 1/6] thermal: core: Store zone trips table in struct thermal_zone_device

[Rafael J. Wysocki]

From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

The current code expects thermal zone creators to pass a pointer to a
writable trips table to thermal_zone_device_register_with_trips() and
that trips table is then used by the thermal core going forward.

Consequently, the callers of thermal_zone_device_register_with_trips()
are required to hold on to the trips table passed to it until the given
thermal zone is unregistered, at which point the trips table can be
freed, but at the same time they are not expected to access that table
directly.  This is both error prone and confusing.

To address it, turn the trips table pointer in struct thermal_zone_device
into a flex array (counted by its num_trips field), allocate it during
thermal zone device allocation and copy the contents of the trips table
supplied by the zone creator (which can be const now) into it, which
will allow the callers of thermal_zone_device_register_with_trips() to
drop their trip tables right after the zone registration.

This requires the imx thermal driver to be adjusted to store the new
temperature in its internal trips table in imx_set_trip_temp(), because
it will be separate from the core's trips table now and it has to be
explicitly kept in sync with the latter.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---

v2 -> v2.1:
   * Remove the trips table freeing from thermal_of (Daniel).
   * Add R-by from Daniel.

v1 -> v2:
   * Rebase.
   * Drop all of the redundant trips[] checks against NULL.
   * Add imx change to still allow it to use its local trips table.
   * Add R-by from Stanislaw (which is still applicable IMV).

---
 drivers/thermal/imx_thermal.c  |    1 +
 drivers/thermal/thermal_core.c |   17 ++++++++---------
 drivers/thermal/thermal_of.c   |    2 --
 drivers/thermal/thermal_trip.c |    2 +-
 include/linux/thermal.h        |   10 +++++-----
 5 files changed, 15 insertions(+), 17 deletions(-)

Index: linux-pm/include/linux/thermal.h
===================================================================
--- linux-pm.orig/include/linux/thermal.h
+++ linux-pm/include/linux/thermal.h
@@ -137,7 +137,6 @@ struct thermal_cooling_device {
  * @trip_hyst_attrs:	attributes for trip points for sysfs: trip hysteresis
  * @mode:		current mode of this thermal zone
  * @devdata:	private pointer for device private data
- * @trips:	an array of struct thermal_trip
  * @num_trips:	number of trip points the thermal zone supports
  * @passive_delay_jiffies: number of jiffies to wait between polls when
  *			performing passive cooling.
@@ -167,6 +166,7 @@ struct thermal_cooling_device {
  * @poll_queue:	delayed work for polling
  * @notify_event: Last notification event
  * @suspended: thermal zone suspend indicator
+ * @trips:	array of struct thermal_trip objects
  */
 struct thermal_zone_device {
 	int id;
@@ -179,7 +179,6 @@ struct thermal_zone_device {
 	struct thermal_attr *trip_hyst_attrs;
 	enum thermal_device_mode mode;
 	void *devdata;
-	struct thermal_trip *trips;
 	int num_trips;
 	unsigned long passive_delay_jiffies;
 	unsigned long polling_delay_jiffies;
@@ -200,10 +199,11 @@ struct thermal_zone_device {
 	struct list_head node;
 	struct delayed_work poll_queue;
 	enum thermal_notify_event notify_event;
+	bool suspended;
 #ifdef CONFIG_THERMAL_DEBUGFS
 	struct thermal_debugfs *debugfs;
 #endif
-	bool suspended;
+	struct thermal_trip trips[] __counted_by(num_trips);
 };
 
 /**
@@ -322,7 +322,7 @@ int thermal_zone_get_crit_temp(struct th
 #ifdef CONFIG_THERMAL
 struct thermal_zone_device *thermal_zone_device_register_with_trips(
 					const char *type,
-					struct thermal_trip *trips,
+					const struct thermal_trip *trips,
 					int num_trips, void *devdata,
 					struct thermal_zone_device_ops *ops,
 					const struct thermal_zone_params *tzp,
@@ -381,7 +381,7 @@ void thermal_zone_device_critical(struct
 #else
 static inline struct thermal_zone_device *thermal_zone_device_register_with_trips(
 					const char *type,
-					struct thermal_trip *trips,
+					const struct thermal_trip *trips,
 					int num_trips, void *devdata,
 					struct thermal_zone_device_ops *ops,
 					const struct thermal_zone_params *tzp,
Index: linux-pm/drivers/thermal/thermal_core.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_core.c
+++ linux-pm/drivers/thermal/thermal_core.c
@@ -1227,9 +1227,6 @@ int thermal_zone_get_crit_temp(struct th
 	if (tz->ops->get_crit_temp)
 		return tz->ops->get_crit_temp(tz, temp);
 
-	if (!tz->trips)
-		return -EINVAL;
-
 	mutex_lock(&tz->lock);
 
 	for (i = 0; i < tz->num_trips; i++) {
@@ -1271,10 +1268,12 @@ EXPORT_SYMBOL_GPL(thermal_zone_get_crit_
  * IS_ERR*() helpers.
  */
 struct thermal_zone_device *
-thermal_zone_device_register_with_trips(const char *type, struct thermal_trip *trips, int num_trips,
-					void *devdata, struct thermal_zone_device_ops *ops,
-					const struct thermal_zone_params *tzp, int passive_delay,
-					int polling_delay)
+thermal_zone_device_register_with_trips(const char *type,
+					const struct thermal_trip *trips,
+					int num_trips, void *devdata,
+					struct thermal_zone_device_ops *ops,
+					const struct thermal_zone_params *tzp,
+					int passive_delay, int polling_delay)
 {
 	struct thermal_zone_device *tz;
 	int id;
@@ -1308,7 +1307,7 @@ thermal_zone_device_register_with_trips(
 	if (!thermal_class)
 		return ERR_PTR(-ENODEV);
 
-	tz = kzalloc(sizeof(*tz), GFP_KERNEL);
+	tz = kzalloc(struct_size(tz, trips, num_trips), GFP_KERNEL);
 	if (!tz)
 		return ERR_PTR(-ENOMEM);
 
@@ -1340,7 +1339,7 @@ thermal_zone_device_register_with_trips(
 	tz->ops = ops;
 	tz->device.class = thermal_class;
 	tz->devdata = devdata;
-	tz->trips = trips;
+	memcpy(tz->trips, trips, num_trips * sizeof(*trips));
 	tz->num_trips = num_trips;
 
 	thermal_set_delay_jiffies(&tz->passive_delay_jiffies, passive_delay);
Index: linux-pm/drivers/thermal/imx_thermal.c
===================================================================
--- linux-pm.orig/drivers/thermal/imx_thermal.c
+++ linux-pm/drivers/thermal/imx_thermal.c
@@ -355,6 +355,7 @@ static int imx_set_trip_temp(struct ther
 		return -EINVAL;
 
 	imx_set_alarm_temp(data, temp);
+	trips[IMX_TRIP_PASSIVE].temperature = temp;
 
 	pm_runtime_put(data->dev);
 
Index: linux-pm/drivers/thermal/thermal_trip.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_trip.c
+++ linux-pm/drivers/thermal/thermal_trip.c
@@ -122,7 +122,7 @@ void __thermal_zone_set_trips(struct the
 int __thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
 			    struct thermal_trip *trip)
 {
-	if (!tz || !tz->trips || trip_id < 0 || trip_id >= tz->num_trips || !trip)
+	if (!tz || trip_id < 0 || trip_id >= tz->num_trips || !trip)
 		return -EINVAL;
 
 	*trip = tz->trips[trip_id];
Index: linux-pm/drivers/thermal/thermal_of.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_of.c
+++ linux-pm/drivers/thermal/thermal_of.c
@@ -440,12 +440,10 @@ static int thermal_of_unbind(struct ther
  */
 static void thermal_of_zone_unregister(struct thermal_zone_device *tz)
 {
-	struct thermal_trip *trips = tz->trips;
 	struct thermal_zone_device_ops *ops = tz->ops;
 
 	thermal_zone_device_disable(tz);
 	thermal_zone_device_unregister(tz);
-	kfree(trips);
 	kfree(ops);
 }
 

Re: [PATCH v2.1 1/6] thermal: core: Store zone trips table in struct thermal_zone_device

[Daniel Lezcano]

On 22/02/2024 14:10, Rafael J. Wysocki wrote:

[ ... ]

> Index: linux-pm/drivers/thermal/thermal_of.c
> ===================================================================
> --- linux-pm.orig/drivers/thermal/thermal_of.c
> +++ linux-pm/drivers/thermal/thermal_of.c
> @@ -440,12 +440,10 @@ static int thermal_of_unbind(struct ther
>    */
>   static void thermal_of_zone_unregister(struct thermal_zone_device *tz)
>   {
> -	struct thermal_trip *trips = tz->trips;
>   	struct thermal_zone_device_ops *ops = tz->ops;
>   
>   	thermal_zone_device_disable(tz);
>   	thermal_zone_device_unregister(tz);
> -	kfree(trips);

thermal_of_zone_register() must free the allocated trip points after 
registering the thermal zone.

>   	kfree(ops);
>   }


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Re: [PATCH v2.1 1/6] thermal: core: Store zone trips table in struct thermal_zone_device

[Rafael J. Wysocki]

On Thu, Feb 22, 2024 at 2:38 PM Daniel Lezcano
<daniel.lezcano@linaro.org> wrote:
>
> On 22/02/2024 14:10, Rafael J. Wysocki wrote:
>
> [ ... ]
>
> > Index: linux-pm/drivers/thermal/thermal_of.c
> > ===================================================================
> > --- linux-pm.orig/drivers/thermal/thermal_of.c
> > +++ linux-pm/drivers/thermal/thermal_of.c
> > @@ -440,12 +440,10 @@ static int thermal_of_unbind(struct ther
> >    */
> >   static void thermal_of_zone_unregister(struct thermal_zone_device *tz)
> >   {
> > -     struct thermal_trip *trips = tz->trips;
> >       struct thermal_zone_device_ops *ops = tz->ops;
> >
> >       thermal_zone_device_disable(tz);
> >       thermal_zone_device_unregister(tz);
> > -     kfree(trips);
>
> thermal_of_zone_register() must free the allocated trip points after
> registering the thermal zone.
>
> >       kfree(ops);
> >   }

Good point.

Let me send another update, then.

[PATCH v2.2 1/6] thermal: core: Store zone trips table in struct thermal_zone_device

[Rafael J. Wysocki]

From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

The current code expects thermal zone creators to pass a pointer to a
writable trips table to thermal_zone_device_register_with_trips() and
that trips table is then used by the thermal core going forward.

Consequently, the callers of thermal_zone_device_register_with_trips()
are required to hold on to the trips table passed to it until the given
thermal zone is unregistered, at which point the trips table can be
freed, but at the same time they are not expected to access that table
directly.  This is both error prone and confusing.

To address it, turn the trips table pointer in struct thermal_zone_device
into a flex array (counted by its num_trips field), allocate it during
thermal zone device allocation and copy the contents of the trips table
supplied by the zone creator (which can be const now) into it, which
will allow the callers of thermal_zone_device_register_with_trips() to
drop their trip tables right after the zone registration.

This requires the imx thermal driver to be adjusted to store the new
temperature in its internal trips table in imx_set_trip_temp(), because
it will be separate from the core's trips table now and it has to be
explicitly kept in sync with the latter.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---

v2.1 -> v2.2:
   * Add missing kfree(trips) to thermal_of_zone_register() (Daniel).

v2 -> v2.1:
   * Remove the trips table freeing from thermal_of (Daniel).
   * Add R-by from Daniel.

v1 -> v2:
   * Rebase.
   * Drop all of the redundant trips[] checks against NULL.
   * Add imx change to still allow it to use its local trips table.
   * Add R-by from Stanislaw (which is still applicable IMV).

---
 drivers/thermal/imx_thermal.c  |    1 +
 drivers/thermal/thermal_core.c |   18 +++++++++---------
 drivers/thermal/thermal_of.c   |    4 ++--
 drivers/thermal/thermal_trip.c |    2 +-
 include/linux/thermal.h        |   10 +++++-----
 5 files changed, 18 insertions(+), 17 deletions(-)

Index: linux-pm/include/linux/thermal.h
===================================================================
--- linux-pm.orig/include/linux/thermal.h
+++ linux-pm/include/linux/thermal.h
@@ -130,7 +130,6 @@ struct thermal_cooling_device {
  * @trip_hyst_attrs:	attributes for trip points for sysfs: trip hysteresis
  * @mode:		current mode of this thermal zone
  * @devdata:	private pointer for device private data
- * @trips:	an array of struct thermal_trip
  * @num_trips:	number of trip points the thermal zone supports
  * @passive_delay_jiffies: number of jiffies to wait between polls when
  *			performing passive cooling.
@@ -160,6 +159,7 @@ struct thermal_cooling_device {
  * @poll_queue:	delayed work for polling
  * @notify_event: Last notification event
  * @suspended: thermal zone suspend indicator
+ * @trips:	array of struct thermal_trip objects
  */
 struct thermal_zone_device {
 	int id;
@@ -172,7 +172,6 @@ struct thermal_zone_device {
 	struct thermal_attr *trip_hyst_attrs;
 	enum thermal_device_mode mode;
 	void *devdata;
-	struct thermal_trip *trips;
 	int num_trips;
 	unsigned long passive_delay_jiffies;
 	unsigned long polling_delay_jiffies;
@@ -193,10 +192,11 @@ struct thermal_zone_device {
 	struct list_head node;
 	struct delayed_work poll_queue;
 	enum thermal_notify_event notify_event;
+	bool suspended;
 #ifdef CONFIG_THERMAL_DEBUGFS
 	struct thermal_debugfs *debugfs;
 #endif
-	bool suspended;
+	struct thermal_trip trips[] __counted_by(num_trips);
 };
 
 /**
@@ -315,7 +315,7 @@ int thermal_zone_get_crit_temp(struct th
 #ifdef CONFIG_THERMAL
 struct thermal_zone_device *thermal_zone_device_register_with_trips(
 					const char *type,
-					struct thermal_trip *trips,
+					const struct thermal_trip *trips,
 					int num_trips, int mask,
 					void *devdata,
 					struct thermal_zone_device_ops *ops,
@@ -375,7 +375,7 @@ void thermal_zone_device_critical(struct
 #else
 static inline struct thermal_zone_device *thermal_zone_device_register_with_trips(
 					const char *type,
-					struct thermal_trip *trips,
+					const struct thermal_trip *trips,
 					int num_trips, int mask,
 					void *devdata,
 					struct thermal_zone_device_ops *ops,
Index: linux-pm/drivers/thermal/thermal_core.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_core.c
+++ linux-pm/drivers/thermal/thermal_core.c
@@ -1227,9 +1227,6 @@ int thermal_zone_get_crit_temp(struct th
 	if (tz->ops->get_crit_temp)
 		return tz->ops->get_crit_temp(tz, temp);
 
-	if (!tz->trips)
-		return -EINVAL;
-
 	mutex_lock(&tz->lock);
 
 	for (i = 0; i < tz->num_trips; i++) {
@@ -1272,10 +1269,13 @@ EXPORT_SYMBOL_GPL(thermal_zone_get_crit_
  * IS_ERR*() helpers.
  */
 struct thermal_zone_device *
-thermal_zone_device_register_with_trips(const char *type, struct thermal_trip *trips, int num_trips, int mask,
-					void *devdata, struct thermal_zone_device_ops *ops,
-					const struct thermal_zone_params *tzp, int passive_delay,
-					int polling_delay)
+thermal_zone_device_register_with_trips(const char *type,
+					const struct thermal_trip *trips,
+					int num_trips, int mask,
+					void *devdata,
+					struct thermal_zone_device_ops *ops,
+					const struct thermal_zone_params *tzp,
+					int passive_delay, int polling_delay)
 {
 	struct thermal_zone_device *tz;
 	int id;
@@ -1322,7 +1322,7 @@ thermal_zone_device_register_with_trips(
 	if (!thermal_class)
 		return ERR_PTR(-ENODEV);
 
-	tz = kzalloc(sizeof(*tz), GFP_KERNEL);
+	tz = kzalloc(struct_size(tz, trips, num_trips), GFP_KERNEL);
 	if (!tz)
 		return ERR_PTR(-ENOMEM);
 
@@ -1354,7 +1354,7 @@ thermal_zone_device_register_with_trips(
 	tz->ops = ops;
 	tz->device.class = thermal_class;
 	tz->devdata = devdata;
-	tz->trips = trips;
+	memcpy(tz->trips, trips, num_trips * sizeof(*trips));
 	tz->num_trips = num_trips;
 
 	thermal_set_delay_jiffies(&tz->passive_delay_jiffies, passive_delay);
Index: linux-pm/drivers/thermal/imx_thermal.c
===================================================================
--- linux-pm.orig/drivers/thermal/imx_thermal.c
+++ linux-pm/drivers/thermal/imx_thermal.c
@@ -354,6 +354,7 @@ static int imx_set_trip_temp(struct ther
 		return -EINVAL;
 
 	imx_set_alarm_temp(data, temp);
+	trips[IMX_TRIP_PASSIVE].temperature = temp;
 
 	pm_runtime_put(data->dev);
 
Index: linux-pm/drivers/thermal/thermal_trip.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_trip.c
+++ linux-pm/drivers/thermal/thermal_trip.c
@@ -122,7 +122,7 @@ void __thermal_zone_set_trips(struct the
 int __thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
 			    struct thermal_trip *trip)
 {
-	if (!tz || !tz->trips || trip_id < 0 || trip_id >= tz->num_trips || !trip)
+	if (!tz || trip_id < 0 || trip_id >= tz->num_trips || !trip)
 		return -EINVAL;
 
 	*trip = tz->trips[trip_id];
Index: linux-pm/drivers/thermal/thermal_of.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_of.c
+++ linux-pm/drivers/thermal/thermal_of.c
@@ -438,12 +438,10 @@ static int thermal_of_unbind(struct ther
  */
 static void thermal_of_zone_unregister(struct thermal_zone_device *tz)
 {
-	struct thermal_trip *trips = tz->trips;
 	struct thermal_zone_device_ops *ops = tz->ops;
 
 	thermal_zone_device_disable(tz);
 	thermal_zone_device_unregister(tz);
-	kfree(trips);
 	kfree(ops);
 }
 
@@ -526,6 +524,8 @@ static struct thermal_zone_device *therm
 		goto out_kfree_trips;
 	}
 
+	kfree(trips);
+
 	ret = thermal_zone_device_enable(tz);
 	if (ret) {
 		pr_err("Failed to enabled thermal zone '%s', id=%d: %d\n",

Re: [PATCH v2.2 1/6] thermal: core: Store zone trips table in struct thermal_zone_device

[Daniel Lezcano]

On 22/02/2024 14:52, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> 
> The current code expects thermal zone creators to pass a pointer to a
> writable trips table to thermal_zone_device_register_with_trips() and
> that trips table is then used by the thermal core going forward.
> 
> Consequently, the callers of thermal_zone_device_register_with_trips()
> are required to hold on to the trips table passed to it until the given
> thermal zone is unregistered, at which point the trips table can be
> freed, but at the same time they are not expected to access that table
> directly.  This is both error prone and confusing.
> 
> To address it, turn the trips table pointer in struct thermal_zone_device
> into a flex array (counted by its num_trips field), allocate it during
> thermal zone device allocation and copy the contents of the trips table
> supplied by the zone creator (which can be const now) into it, which
> will allow the callers of thermal_zone_device_register_with_trips() to
> drop their trip tables right after the zone registration.
> 
> This requires the imx thermal driver to be adjusted to store the new
> temperature in its internal trips table in imx_set_trip_temp(), because
> it will be separate from the core's trips table now and it has to be
> explicitly kept in sync with the latter.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
> Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>
> ---
> 
> v2.1 -> v2.2:
>     * Add missing kfree(trips) to thermal_of_zone_register() (Daniel).

OK for me


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[PATCH v2 2/6] thermal: ACPI: Discard trips table after zone registration

[Rafael J. Wysocki]

From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Because the thermal core creates and uses its own copy of the trips
table passed to thermal_zone_device_register_with_trips(), it is not
necessary to hold on to a local copy of it any more after the given
thermal zone has been registered.

Accordingly, modify the ACPI thermal driver to store the trips table
passed to thermal_zone_device_register_with_trips() in a local variable
which is automatically discarded when acpi_thermal_add() returns to
its caller.

Also make some additional code simplifications unlocked by the above
change.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
---

v1 -> v2: Add R-by from Stanislaw.

---
 drivers/acpi/thermal.c |   57 +++++++++++++++++--------------------------------
 1 file changed, 20 insertions(+), 37 deletions(-)

Index: linux-pm/drivers/acpi/thermal.c
===================================================================
--- linux-pm.orig/drivers/acpi/thermal.c
+++ linux-pm/drivers/acpi/thermal.c
@@ -47,6 +47,8 @@
 
 #define ACPI_THERMAL_TRIP_PASSIVE	(-1)
 
+#define ACPI_THERMAL_MAX_NR_TRIPS	(ACPI_THERMAL_MAX_ACTIVE + 3)
+
 /*
  * This exception is thrown out in two cases:
  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
@@ -112,7 +114,6 @@ struct acpi_thermal {
 	unsigned long polling_frequency;
 	volatile u8 zombie;
 	struct acpi_thermal_trips trips;
-	struct thermal_trip *trip_table;
 	struct thermal_zone_device *thermal_zone;
 	int kelvin_offset;	/* in millidegrees */
 	struct work_struct thermal_check_work;
@@ -451,26 +452,19 @@ fail:
 	return false;
 }
 
-static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
+static void acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 {
-	unsigned int count = 0;
 	int i;
 
-	if (acpi_thermal_init_trip(tz, ACPI_THERMAL_TRIP_PASSIVE))
-		count++;
+	acpi_thermal_init_trip(tz, ACPI_THERMAL_TRIP_PASSIVE);
 
 	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
-		if (acpi_thermal_init_trip(tz, i))
-			count++;
-		else
+		if (!acpi_thermal_init_trip(tz, i))
 			break;
-
 	}
 
 	while (++i < ACPI_THERMAL_MAX_ACTIVE)
 		tz->trips.active[i].trip.temp_dk = THERMAL_TEMP_INVALID;
-
-	return count;
 }
 
 /* sys I/F for generic thermal sysfs support */
@@ -662,13 +656,14 @@ static void acpi_thermal_zone_sysfs_remo
 }
 
 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz,
+					      const struct thermal_trip *trip_table,
 					      unsigned int trip_count,
 					      int passive_delay)
 {
 	int result;
 
 	tz->thermal_zone = thermal_zone_device_register_with_trips("acpitz",
-								   tz->trip_table,
+								   trip_table,
 								   trip_count,
 								   tz,
 								   &acpi_thermal_zone_ops,
@@ -823,10 +818,10 @@ static void acpi_thermal_free_thermal_zo
 
 static int acpi_thermal_add(struct acpi_device *device)
 {
+	struct thermal_trip trip_table[ACPI_THERMAL_MAX_NR_TRIPS] = { 0 };
 	struct acpi_thermal_trip *acpi_trip;
 	struct thermal_trip *trip;
 	struct acpi_thermal *tz;
-	unsigned int trip_count;
 	int crit_temp, hot_temp;
 	int passive_delay = 0;
 	int result;
@@ -848,21 +843,10 @@ static int acpi_thermal_add(struct acpi_
 	acpi_thermal_aml_dependency_fix(tz);
 
 	/* Get trip points [_CRT, _PSV, etc.] (required). */
-	trip_count = acpi_thermal_get_trip_points(tz);
+	acpi_thermal_get_trip_points(tz);
 
 	crit_temp = acpi_thermal_get_critical_trip(tz);
-	if (crit_temp != THERMAL_TEMP_INVALID)
-		trip_count++;
-
 	hot_temp = acpi_thermal_get_hot_trip(tz);
-	if (hot_temp != THERMAL_TEMP_INVALID)
-		trip_count++;
-
-	if (!trip_count) {
-		pr_warn(FW_BUG "No valid trip points!\n");
-		result = -ENODEV;
-		goto free_memory;
-	}
 
 	/* Get temperature [_TMP] (required). */
 	result = acpi_thermal_get_temperature(tz);
@@ -881,13 +865,7 @@ static int acpi_thermal_add(struct acpi_
 
 	acpi_thermal_guess_offset(tz, crit_temp);
 
-	trip = kcalloc(trip_count, sizeof(*trip), GFP_KERNEL);
-	if (!trip) {
-		result = -ENOMEM;
-		goto free_memory;
-	}
-
-	tz->trip_table = trip;
+	trip = trip_table;
 
 	if (crit_temp != THERMAL_TEMP_INVALID) {
 		trip->type = THERMAL_TRIP_CRITICAL;
@@ -923,9 +901,17 @@ static int acpi_thermal_add(struct acpi_
 		trip++;
 	}
 
-	result = acpi_thermal_register_thermal_zone(tz, trip_count, passive_delay);
+	if (trip == trip_table) {
+		pr_warn(FW_BUG "No valid trip points!\n");
+		result = -ENODEV;
+		goto free_memory;
+	}
+
+	result = acpi_thermal_register_thermal_zone(tz, trip_table,
+						    trip - trip_table,
+						    passive_delay);
 	if (result)
-		goto free_trips;
+		goto free_memory;
 
 	refcount_set(&tz->thermal_check_count, 3);
 	mutex_init(&tz->thermal_check_lock);
@@ -944,8 +930,6 @@ static int acpi_thermal_add(struct acpi_
 flush_wq:
 	flush_workqueue(acpi_thermal_pm_queue);
 	acpi_thermal_unregister_thermal_zone(tz);
-free_trips:
-	kfree(tz->trip_table);
 free_memory:
 	acpi_thermal_free_thermal_zone(tz);
 
@@ -966,7 +950,6 @@ static void acpi_thermal_remove(struct a
 
 	flush_workqueue(acpi_thermal_pm_queue);
 	acpi_thermal_unregister_thermal_zone(tz);
-	kfree(tz->trip_table);
 	acpi_thermal_free_thermal_zone(tz);
 }
 

Re: [PATCH v2 2/6] thermal: ACPI: Discard trips table after zone registration

[Daniel Lezcano]

On 14/02/2024 13:30, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> 
> Because the thermal core creates and uses its own copy of the trips
> table passed to thermal_zone_device_register_with_trips(), it is not
> necessary to hold on to a local copy of it any more after the given
> thermal zone has been registered.
> 
> Accordingly, modify the ACPI thermal driver to store the trips table
> passed to thermal_zone_device_register_with_trips() in a local variable
> which is automatically discarded when acpi_thermal_add() returns to
> its caller.
> 
> Also make some additional code simplifications unlocked by the above
> change.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>

Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>


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[PATCH v2 3/6] thermal: intel: Discard trip tables after zone registration

[Rafael J. Wysocki]

From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Because the thermal core creates and uses its own copy of the trips
table passed to thermal_zone_device_register_with_trips(), it is not
necessary to hold on to a local copy of it any more after the given
thermal zone has been registered.

Accordingly, modify Intel thermal drivers to discard the trips tables
passed to thermal_zone_device_register_with_trips() after thermal zone
registration, for example by storing them in local variables which are
automatically discarded when the zone registration is complete.

Also make some additional code simplifications unlocked by the above
changes.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

v1 -> v2: Rebase.

---
 drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c         |    6 -
 drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.h         |    1 
 drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c |    9 +-
 drivers/thermal/intel/intel_pch_thermal.c                            |   24 +++---
 drivers/thermal/intel/intel_quark_dts_thermal.c                      |    4 -
 drivers/thermal/intel/intel_soc_dts_iosf.c                           |   14 ++--
 drivers/thermal/intel/intel_soc_dts_iosf.h                           |    1 
 drivers/thermal/intel/x86_pkg_temp_thermal.c                         |   35 +++-------
 8 files changed, 40 insertions(+), 54 deletions(-)

Index: linux-pm/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c
===================================================================
--- linux-pm.orig/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c
+++ linux-pm/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c
@@ -177,8 +177,6 @@ struct int34x_thermal_zone *int340x_ther
 	for (i = 0; i < trip_cnt; ++i)
 		zone_trips[i].hysteresis = hyst;
 
-	int34x_zone->trips = zone_trips;
-
 	int34x_zone->lpat_table = acpi_lpat_get_conversion_table(adev->handle);
 
 	int34x_zone->zone = thermal_zone_device_register_with_trips(
@@ -188,6 +186,8 @@ struct int34x_thermal_zone *int340x_ther
 							int34x_zone->ops,
 							&int340x_thermal_params,
 							0, 0);
+	kfree(zone_trips);
+
 	if (IS_ERR(int34x_zone->zone)) {
 		ret = PTR_ERR(int34x_zone->zone);
 		goto err_thermal_zone;
@@ -201,7 +201,6 @@ struct int34x_thermal_zone *int340x_ther
 err_enable:
 	thermal_zone_device_unregister(int34x_zone->zone);
 err_thermal_zone:
-	kfree(int34x_zone->trips);
 	acpi_lpat_free_conversion_table(int34x_zone->lpat_table);
 err_trips_alloc:
 	kfree(int34x_zone->ops);
@@ -215,7 +214,6 @@ void int340x_thermal_zone_remove(struct
 {
 	thermal_zone_device_unregister(int34x_zone->zone);
 	acpi_lpat_free_conversion_table(int34x_zone->lpat_table);
-	kfree(int34x_zone->trips);
 	kfree(int34x_zone->ops);
 	kfree(int34x_zone);
 }
Index: linux-pm/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.h
===================================================================
--- linux-pm.orig/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.h
+++ linux-pm/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.h
@@ -20,7 +20,6 @@ struct active_trip {
 
 struct int34x_thermal_zone {
 	struct acpi_device *adev;
-	struct thermal_trip *trips;
 	int aux_trip_nr;
 	struct thermal_zone_device *zone;
 	struct thermal_zone_device_ops *ops;
Index: linux-pm/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c
===================================================================
--- linux-pm.orig/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c
+++ linux-pm/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c
@@ -233,11 +233,6 @@ static int get_trip_temp(struct proc_the
 	return temp;
 }
 
-static struct thermal_trip psv_trip = {
-	.type = THERMAL_TRIP_PASSIVE,
-	.flags = THERMAL_TRIP_FLAG_RW_TEMP,
-};
-
 static struct thermal_zone_device_ops tzone_ops = {
 	.get_temp = sys_get_curr_temp,
 	.set_trip_temp	= sys_set_trip_temp,
@@ -252,6 +247,10 @@ static int proc_thermal_pci_probe(struct
 {
 	struct proc_thermal_device *proc_priv;
 	struct proc_thermal_pci *pci_info;
+	struct thermal_trip psv_trip = {
+		.type = THERMAL_TRIP_PASSIVE,
+		.flags = THERMAL_TRIP_FLAG_RW_TEMP,
+	};
 	int irq_flag = 0, irq, ret;
 	bool msi_irq = false;
 
Index: linux-pm/drivers/thermal/intel/intel_pch_thermal.c
===================================================================
--- linux-pm.orig/drivers/thermal/intel/intel_pch_thermal.c
+++ linux-pm/drivers/thermal/intel/intel_pch_thermal.c
@@ -84,7 +84,6 @@ struct pch_thermal_device {
 	void __iomem *hw_base;
 	struct pci_dev *pdev;
 	struct thermal_zone_device *tzd;
-	struct thermal_trip trips[PCH_MAX_TRIPS];
 	bool bios_enabled;
 };
 
@@ -94,7 +93,8 @@ struct pch_thermal_device {
  * passive trip temperature using _PSV method. There is no specific
  * passive temperature setting in MMIO interface of this PCI device.
  */
-static int pch_wpt_add_acpi_psv_trip(struct pch_thermal_device *ptd, int trip)
+static int pch_wpt_add_acpi_psv_trip(struct pch_thermal_device *ptd,
+				     struct thermal_trip *trip)
 {
 	struct acpi_device *adev;
 	int temp;
@@ -106,12 +106,13 @@ static int pch_wpt_add_acpi_psv_trip(str
 	if (thermal_acpi_passive_trip_temp(adev, &temp) || temp <= 0)
 		return 0;
 
-	ptd->trips[trip].type = THERMAL_TRIP_PASSIVE;
-	ptd->trips[trip].temperature = temp;
+	trip->type = THERMAL_TRIP_PASSIVE;
+	trip->temperature = temp;
 	return 1;
 }
 #else
-static int pch_wpt_add_acpi_psv_trip(struct pch_thermal_device *ptd, int trip)
+static int pch_wpt_add_acpi_psv_trip(struct pch_thermal_device *ptd,
+				     struct thermal_trip *trip)
 {
 	return 0;
 }
@@ -159,6 +160,7 @@ static const char *board_names[] = {
 static int intel_pch_thermal_probe(struct pci_dev *pdev,
 				   const struct pci_device_id *id)
 {
+	struct thermal_trip ptd_trips[PCH_MAX_TRIPS] = { 0 };
 	enum pch_board_ids board_id = id->driver_data;
 	struct pch_thermal_device *ptd;
 	int nr_trips = 0;
@@ -220,21 +222,21 @@ read_trips:
 	trip_temp = readw(ptd->hw_base + WPT_CTT);
 	trip_temp &= 0x1FF;
 	if (trip_temp) {
-		ptd->trips[nr_trips].temperature = GET_WPT_TEMP(trip_temp);
-		ptd->trips[nr_trips++].type = THERMAL_TRIP_CRITICAL;
+		ptd_trips[nr_trips].temperature = GET_WPT_TEMP(trip_temp);
+		ptd_trips[nr_trips++].type = THERMAL_TRIP_CRITICAL;
 	}
 
 	trip_temp = readw(ptd->hw_base + WPT_PHL);
 	trip_temp &= 0x1FF;
 	if (trip_temp) {
-		ptd->trips[nr_trips].temperature = GET_WPT_TEMP(trip_temp);
-		ptd->trips[nr_trips++].type = THERMAL_TRIP_HOT;
+		ptd_trips[nr_trips].temperature = GET_WPT_TEMP(trip_temp);
+		ptd_trips[nr_trips++].type = THERMAL_TRIP_HOT;
 	}
 
-	nr_trips += pch_wpt_add_acpi_psv_trip(ptd, nr_trips);
+	nr_trips += pch_wpt_add_acpi_psv_trip(ptd, &ptd_trips[nr_trips]);
 
 	ptd->tzd = thermal_zone_device_register_with_trips(board_names[board_id],
-							   ptd->trips, nr_trips,
+							   ptd_trips, nr_trips,
 							   ptd, &tzd_ops,
 							   NULL, 0, 0);
 	if (IS_ERR(ptd->tzd)) {
Index: linux-pm/drivers/thermal/intel/intel_quark_dts_thermal.c
===================================================================
--- linux-pm.orig/drivers/thermal/intel/intel_quark_dts_thermal.c
+++ linux-pm/drivers/thermal/intel/intel_quark_dts_thermal.c
@@ -101,7 +101,6 @@ struct soc_sensor_entry {
 	u32 store_ptps;
 	u32 store_dts_enable;
 	struct thermal_zone_device *tzone;
-	struct thermal_trip trips[QRK_MAX_DTS_TRIPS];
 };
 
 static struct soc_sensor_entry *soc_dts;
@@ -316,8 +315,8 @@ static void free_soc_dts(struct soc_sens
 
 static struct soc_sensor_entry *alloc_soc_dts(void)
 {
+	struct thermal_trip trips[QRK_MAX_DTS_TRIPS];
 	struct soc_sensor_entry *aux_entry;
-	struct thermal_trip *trips;
 	int err;
 	u32 out;
 
@@ -326,7 +325,6 @@ static struct soc_sensor_entry *alloc_so
 		err = -ENOMEM;
 		return ERR_PTR(-ENOMEM);
 	}
-	trips = aux_entry->trips;
 
 	/* Check if DTS register is locked */
 	err = iosf_mbi_read(QRK_MBI_UNIT_RMU, MBI_REG_READ,
Index: linux-pm/drivers/thermal/intel/intel_soc_dts_iosf.c
===================================================================
--- linux-pm.orig/drivers/thermal/intel/intel_soc_dts_iosf.c
+++ linux-pm/drivers/thermal/intel/intel_soc_dts_iosf.c
@@ -201,7 +201,8 @@ static void remove_dts_thermal_zone(stru
 	thermal_zone_device_unregister(dts->tzone);
 }
 
-static int add_dts_thermal_zone(int id, struct intel_soc_dts_sensor_entry *dts)
+static int add_dts_thermal_zone(int id, struct intel_soc_dts_sensor_entry *dts,
+				struct thermal_trip *trips)
 {
 	char name[10];
 	u32 store_ptps;
@@ -223,11 +224,11 @@ static int add_dts_thermal_zone(int id,
 
 		for (i = 0; i <= 1; i++) {
 			if (store_ptps & (0xFFU << i * 8))
-				dts->trips[i].flags &= ~THERMAL_TRIP_FLAG_RW_TEMP;
+				trips[i].flags &= ~THERMAL_TRIP_FLAG_RW_TEMP;
 		}
 	}
 	snprintf(name, sizeof(name), "soc_dts%d", id);
-	dts->tzone = thermal_zone_device_register_with_trips(name, dts->trips,
+	dts->tzone = thermal_zone_device_register_with_trips(name, trips,
 							     SOC_MAX_DTS_TRIPS,
 							     dts, &tzone_ops,
 							     NULL, 0, 0);
@@ -303,6 +304,7 @@ struct intel_soc_dts_sensors *
 intel_soc_dts_iosf_init(enum intel_soc_dts_interrupt_type intr_type,
 			bool critical_trip, int crit_offset)
 {
+	struct thermal_trip trips[SOC_MAX_DTS_SENSORS][SOC_MAX_DTS_TRIPS] = { 0 };
 	struct intel_soc_dts_sensors *sensors;
 	int tj_max;
 	int ret;
@@ -335,7 +337,7 @@ intel_soc_dts_iosf_init(enum intel_soc_d
 		if (ret)
 			goto err_reset_trips;
 
-		set_trip(&sensors->soc_dts[i].trips[0], THERMAL_TRIP_PASSIVE,
+		set_trip(&trips[i][0], THERMAL_TRIP_PASSIVE,
 			 THERMAL_TRIP_FLAG_RW_TEMP, 0);
 
 		if (critical_trip) {
@@ -351,11 +353,11 @@ intel_soc_dts_iosf_init(enum intel_soc_d
 		if (ret)
 			goto err_reset_trips;
 
-		set_trip(&sensors->soc_dts[i].trips[1], trip_type, trip_flags, temp);
+		set_trip(&trips[i][1], trip_type, trip_flags, temp);
 	}
 
 	for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
-		ret = add_dts_thermal_zone(i, &sensors->soc_dts[i]);
+		ret = add_dts_thermal_zone(i, &sensors->soc_dts[i], trips[i]);
 		if (ret)
 			goto err_remove_zone;
 	}
Index: linux-pm/drivers/thermal/intel/intel_soc_dts_iosf.h
===================================================================
--- linux-pm.orig/drivers/thermal/intel/intel_soc_dts_iosf.h
+++ linux-pm/drivers/thermal/intel/intel_soc_dts_iosf.h
@@ -28,7 +28,6 @@ struct intel_soc_dts_sensors;
 struct intel_soc_dts_sensor_entry {
 	int id;
 	u32 store_status;
-	struct thermal_trip trips[SOC_MAX_DTS_TRIPS];
 	struct thermal_zone_device *tzone;
 	struct intel_soc_dts_sensors *sensors;
 };
Index: linux-pm/drivers/thermal/intel/x86_pkg_temp_thermal.c
===================================================================
--- linux-pm.orig/drivers/thermal/intel/x86_pkg_temp_thermal.c
+++ linux-pm/drivers/thermal/intel/x86_pkg_temp_thermal.c
@@ -53,7 +53,6 @@ struct zone_device {
 	u32				msr_pkg_therm_high;
 	struct delayed_work		work;
 	struct thermal_zone_device	*tzone;
-	struct thermal_trip		*trips;
 	struct cpumask			cpumask;
 };
 
@@ -268,17 +267,13 @@ static int pkg_thermal_notify(u64 msr_va
 	return 0;
 }
 
-static struct thermal_trip *pkg_temp_thermal_trips_init(int cpu, int tj_max, int num_trips)
+static int pkg_temp_thermal_trips_init(int cpu, int tj_max,
+				       struct thermal_trip *trips, int num_trips)
 {
-	struct thermal_trip *trips;
 	unsigned long thres_reg_value;
 	u32 mask, shift, eax, edx;
 	int ret, i;
 
-	trips = kzalloc(sizeof(*trips) * num_trips, GFP_KERNEL);
-	if (!trips)
-		return ERR_PTR(-ENOMEM);
-
 	for (i = 0; i < num_trips; i++) {
 
 		if (i) {
@@ -291,10 +286,8 @@ static struct thermal_trip *pkg_temp_the
 
 		ret = rdmsr_on_cpu(cpu, MSR_IA32_PACKAGE_THERM_INTERRUPT,
 				   &eax, &edx);
-		if (ret < 0) {
-			kfree(trips);
-			return ERR_PTR(ret);
-		}
+		if (ret < 0)
+			return ret;
 
 		thres_reg_value = (eax & mask) >> shift;
 
@@ -308,11 +301,12 @@ static struct thermal_trip *pkg_temp_the
 			 __func__, cpu, i, trips[i].temperature);
 	}
 
-	return trips;
+	return 0;
 }
 
 static int pkg_temp_thermal_device_add(unsigned int cpu)
 {
+	struct thermal_trip trips[MAX_NUMBER_OF_TRIPS] = { 0 };
 	int id = topology_logical_die_id(cpu);
 	u32 eax, ebx, ecx, edx;
 	struct zone_device *zonedev;
@@ -337,20 +331,18 @@ static int pkg_temp_thermal_device_add(u
 	if (!zonedev)
 		return -ENOMEM;
 
-	zonedev->trips = pkg_temp_thermal_trips_init(cpu, tj_max, thres_count);
-	if (IS_ERR(zonedev->trips)) {
-		err = PTR_ERR(zonedev->trips);
+	err = pkg_temp_thermal_trips_init(cpu, tj_max, trips, thres_count);
+	if (err)
 		goto out_kfree_zonedev;
-	}
 
 	INIT_DELAYED_WORK(&zonedev->work, pkg_temp_thermal_threshold_work_fn);
 	zonedev->cpu = cpu;
 	zonedev->tzone = thermal_zone_device_register_with_trips("x86_pkg_temp",
-			zonedev->trips, thres_count,
+			trips, thres_count,
 			zonedev, &tzone_ops, &pkg_temp_tz_params, 0, 0);
 	if (IS_ERR(zonedev->tzone)) {
 		err = PTR_ERR(zonedev->tzone);
-		goto out_kfree_trips;
+		goto out_kfree_zonedev;
 	}
 	err = thermal_zone_device_enable(zonedev->tzone);
 	if (err)
@@ -369,8 +361,6 @@ static int pkg_temp_thermal_device_add(u
 
 out_unregister_tz:
 	thermal_zone_device_unregister(zonedev->tzone);
-out_kfree_trips:
-	kfree(zonedev->trips);
 out_kfree_zonedev:
 	kfree(zonedev);
 	return err;
@@ -457,10 +447,9 @@ static int pkg_thermal_cpu_offline(unsig
 	raw_spin_unlock_irq(&pkg_temp_lock);
 
 	/* Final cleanup if this is the last cpu */
-	if (lastcpu) {
-		kfree(zonedev->trips);
+	if (lastcpu)
 		kfree(zonedev);
-	}
+
 	return 0;
 }
 

Re: [PATCH v2 3/6] thermal: intel: Discard trip tables after zone registration

[Daniel Lezcano]

On 14/02/2024 13:42, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> 
> Because the thermal core creates and uses its own copy of the trips
> table passed to thermal_zone_device_register_with_trips(), it is not
> necessary to hold on to a local copy of it any more after the given
> thermal zone has been registered.
> 
> Accordingly, modify Intel thermal drivers to discard the trips tables
> passed to thermal_zone_device_register_with_trips() after thermal zone
> registration, for example by storing them in local variables which are
> automatically discarded when the zone registration is complete.
> 
> Also make some additional code simplifications unlocked by the above
> changes.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>

-- 
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[PATCH v2 4/6] thermal: core: Store zone ops in struct thermal_zone_device

[Rafael J. Wysocki]

From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

The current code requires thermal zone creators to pass pointers to
writable ops structures to thermal_zone_device_register_with_trips()
which needs to modify the target struct thermal_zone_device_ops object
if the "critical" operation in it is NULL.

Moreover, the callers of thermal_zone_device_register_with_trips() are
required to hold on to the struct thermal_zone_device_ops object passed
to it until the given thermal zone is unregistered.

Both of these requirements are quite inconvenient, so modify struct
thermal_zone_device to contain struct thermal_zone_device_ops as field and
make thermal_zone_device_register_with_trips() copy the contents of the
struct thermal_zone_device_ops passed to it via a pointer (which can be
const now) to that field.

Also adjust the code using thermal zone ops accordingly and modify
thermal_of_zone_register() to use a local ops variable during
thermal zone registration so ops do not need to be freed in
thermal_of_zone_unregister() any more.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
---

v1 -> v2:
   * Rebase.
   * Add thermal_of modifications.
   * Add R-by from Stanislaw (still applicable IMV).

---
 drivers/thermal/thermal_core.c    |   40 +++++++++++++++++++-------------------
 drivers/thermal/thermal_helpers.c |   10 ++++-----
 drivers/thermal/thermal_hwmon.c   |    4 +--
 drivers/thermal/thermal_of.c      |   26 +++++++-----------------
 drivers/thermal/thermal_sysfs.c   |    8 +++----
 drivers/thermal/thermal_trip.c    |    4 +--
 include/linux/thermal.h           |    6 ++---
 7 files changed, 44 insertions(+), 54 deletions(-)

Index: linux-pm/include/linux/thermal.h
===================================================================
--- linux-pm.orig/include/linux/thermal.h
+++ linux-pm/include/linux/thermal.h
@@ -189,7 +189,7 @@ struct thermal_zone_device {
 	int prev_low_trip;
 	int prev_high_trip;
 	atomic_t need_update;
-	struct thermal_zone_device_ops *ops;
+	struct thermal_zone_device_ops ops;
 	struct thermal_zone_params *tzp;
 	struct thermal_governor *governor;
 	void *governor_data;
@@ -324,14 +324,14 @@ struct thermal_zone_device *thermal_zone
 					const char *type,
 					const struct thermal_trip *trips,
 					int num_trips, void *devdata,
-					struct thermal_zone_device_ops *ops,
+					const struct thermal_zone_device_ops *ops,
 					const struct thermal_zone_params *tzp,
 					int passive_delay, int polling_delay);
 
 struct thermal_zone_device *thermal_tripless_zone_device_register(
 					const char *type,
 					void *devdata,
-					struct thermal_zone_device_ops *ops,
+					const struct thermal_zone_device_ops *ops,
 					const struct thermal_zone_params *tzp);
 
 void thermal_zone_device_unregister(struct thermal_zone_device *tz);
Index: linux-pm/drivers/thermal/thermal_core.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_core.c
+++ linux-pm/drivers/thermal/thermal_core.c
@@ -356,9 +356,9 @@ static void handle_critical_trips(struct
 	trace_thermal_zone_trip(tz, thermal_zone_trip_id(tz, trip), trip->type);
 
 	if (trip->type == THERMAL_TRIP_CRITICAL)
-		tz->ops->critical(tz);
-	else if (tz->ops->hot)
-		tz->ops->hot(tz);
+		tz->ops.critical(tz);
+	else if (tz->ops.hot)
+		tz->ops.hot(tz);
 }
 
 static void handle_thermal_trip(struct thermal_zone_device *tz,
@@ -493,8 +493,8 @@ static int thermal_zone_device_set_mode(
 		return ret;
 	}
 
-	if (tz->ops->change_mode)
-		ret = tz->ops->change_mode(tz, mode);
+	if (tz->ops.change_mode)
+		ret = tz->ops.change_mode(tz, mode);
 
 	if (!ret)
 		tz->mode = mode;
@@ -867,8 +867,8 @@ static void bind_cdev(struct thermal_coo
 	struct thermal_zone_device *pos = NULL;
 
 	list_for_each_entry(pos, &thermal_tz_list, node) {
-		if (pos->ops->bind) {
-			ret = pos->ops->bind(pos, cdev);
+		if (pos->ops.bind) {
+			ret = pos->ops.bind(pos, cdev);
 			if (ret)
 				print_bind_err_msg(pos, cdev, ret);
 		}
@@ -1184,8 +1184,8 @@ void thermal_cooling_device_unregister(s
 
 	/* Unbind all thermal zones associated with 'this' cdev */
 	list_for_each_entry(tz, &thermal_tz_list, node) {
-		if (tz->ops->unbind)
-			tz->ops->unbind(tz, cdev);
+		if (tz->ops.unbind)
+			tz->ops.unbind(tz, cdev);
 	}
 
 	mutex_unlock(&thermal_list_lock);
@@ -1199,13 +1199,13 @@ static void bind_tz(struct thermal_zone_
 	int ret;
 	struct thermal_cooling_device *pos = NULL;
 
-	if (!tz->ops->bind)
+	if (!tz->ops.bind)
 		return;
 
 	mutex_lock(&thermal_list_lock);
 
 	list_for_each_entry(pos, &thermal_cdev_list, node) {
-		ret = tz->ops->bind(tz, pos);
+		ret = tz->ops.bind(tz, pos);
 		if (ret)
 			print_bind_err_msg(tz, pos, ret);
 	}
@@ -1224,8 +1224,8 @@ int thermal_zone_get_crit_temp(struct th
 {
 	int i, ret = -EINVAL;
 
-	if (tz->ops->get_crit_temp)
-		return tz->ops->get_crit_temp(tz, temp);
+	if (tz->ops.get_crit_temp)
+		return tz->ops.get_crit_temp(tz, temp);
 
 	mutex_lock(&tz->lock);
 
@@ -1271,7 +1271,7 @@ struct thermal_zone_device *
 thermal_zone_device_register_with_trips(const char *type,
 					const struct thermal_trip *trips,
 					int num_trips, void *devdata,
-					struct thermal_zone_device_ops *ops,
+					const struct thermal_zone_device_ops *ops,
 					const struct thermal_zone_params *tzp,
 					int passive_delay, int polling_delay)
 {
@@ -1333,10 +1333,10 @@ thermal_zone_device_register_with_trips(
 	tz->id = id;
 	strscpy(tz->type, type, sizeof(tz->type));
 
-	if (!ops->critical)
-		ops->critical = thermal_zone_device_critical;
+	tz->ops = *ops;
+	if (!tz->ops.critical)
+		tz->ops.critical = thermal_zone_device_critical;
 
-	tz->ops = ops;
 	tz->device.class = thermal_class;
 	tz->devdata = devdata;
 	memcpy(tz->trips, trips, num_trips * sizeof(*trips));
@@ -1422,7 +1422,7 @@ EXPORT_SYMBOL_GPL(thermal_zone_device_re
 struct thermal_zone_device *thermal_tripless_zone_device_register(
 					const char *type,
 					void *devdata,
-					struct thermal_zone_device_ops *ops,
+					const struct thermal_zone_device_ops *ops,
 					const struct thermal_zone_params *tzp)
 {
 	return thermal_zone_device_register_with_trips(type, NULL, 0, devdata,
@@ -1484,8 +1484,8 @@ void thermal_zone_device_unregister(stru
 
 	/* Unbind all cdevs associated with 'this' thermal zone */
 	list_for_each_entry(cdev, &thermal_cdev_list, node)
-		if (tz->ops->unbind)
-			tz->ops->unbind(tz, cdev);
+		if (tz->ops.unbind)
+			tz->ops.unbind(tz, cdev);
 
 	mutex_unlock(&thermal_list_lock);
 
Index: linux-pm/drivers/thermal/thermal_sysfs.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_sysfs.c
+++ linux-pm/drivers/thermal/thermal_sysfs.c
@@ -128,8 +128,8 @@ trip_point_temp_store(struct device *dev
 	}
 
 	if (temp != trip->temperature) {
-		if (tz->ops->set_trip_temp) {
-			ret = tz->ops->set_trip_temp(tz, trip_id, temp);
+		if (tz->ops.set_trip_temp) {
+			ret = tz->ops.set_trip_temp(tz, trip_id, temp);
 			if (ret)
 				goto unlock;
 		}
@@ -254,10 +254,10 @@ emul_temp_store(struct device *dev, stru
 
 	mutex_lock(&tz->lock);
 
-	if (!tz->ops->set_emul_temp)
+	if (!tz->ops.set_emul_temp)
 		tz->emul_temperature = temperature;
 	else
-		ret = tz->ops->set_emul_temp(tz, temperature);
+		ret = tz->ops.set_emul_temp(tz, temperature);
 
 	if (!ret)
 		__thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
Index: linux-pm/drivers/thermal/thermal_helpers.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_helpers.c
+++ linux-pm/drivers/thermal/thermal_helpers.c
@@ -26,8 +26,8 @@ int get_tz_trend(struct thermal_zone_dev
 {
 	enum thermal_trend trend;
 
-	if (tz->emul_temperature || !tz->ops->get_trend ||
-	    tz->ops->get_trend(tz, trip, &trend)) {
+	if (tz->emul_temperature || !tz->ops.get_trend ||
+	    tz->ops.get_trend(tz, trip, &trend)) {
 		if (tz->temperature > tz->last_temperature)
 			trend = THERMAL_TREND_RAISING;
 		else if (tz->temperature < tz->last_temperature)
@@ -75,7 +75,7 @@ EXPORT_SYMBOL(get_thermal_instance);
  * temperature and fill @temp.
  *
  * Both tz and tz->ops must be valid pointers when calling this function,
- * and the tz->ops->get_temp callback must be provided.
+ * and the tz->ops.get_temp callback must be provided.
  * The function must be called under tz->lock.
  *
  * Return: On success returns 0, an error code otherwise
@@ -88,7 +88,7 @@ int __thermal_zone_get_temp(struct therm
 
 	lockdep_assert_held(&tz->lock);
 
-	ret = tz->ops->get_temp(tz, temp);
+	ret = tz->ops.get_temp(tz, temp);
 
 	if (IS_ENABLED(CONFIG_THERMAL_EMULATION) && tz->emul_temperature) {
 		for_each_trip(tz, trip) {
@@ -132,7 +132,7 @@ int thermal_zone_get_temp(struct thermal
 
 	mutex_lock(&tz->lock);
 
-	if (!tz->ops->get_temp) {
+	if (!tz->ops.get_temp) {
 		ret = -EINVAL;
 		goto unlock;
 	}
Index: linux-pm/drivers/thermal/thermal_trip.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_trip.c
+++ linux-pm/drivers/thermal/thermal_trip.c
@@ -70,7 +70,7 @@ void __thermal_zone_set_trips(struct the
 
 	lockdep_assert_held(&tz->lock);
 
-	if (!tz->ops->set_trips)
+	if (!tz->ops.set_trips)
 		return;
 
 	for_each_trip(tz, trip) {
@@ -114,7 +114,7 @@ void __thermal_zone_set_trips(struct the
 	 * Set a temperature window. When this window is left the driver
 	 * must inform the thermal core via thermal_zone_device_update.
 	 */
-	ret = tz->ops->set_trips(tz, low, high);
+	ret = tz->ops.set_trips(tz, low, high);
 	if (ret)
 		dev_err(&tz->device, "Failed to set trips: %d\n", ret);
 }
Index: linux-pm/drivers/thermal/thermal_hwmon.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_hwmon.c
+++ linux-pm/drivers/thermal/thermal_hwmon.c
@@ -80,7 +80,7 @@ temp_crit_show(struct device *dev, struc
 
 	mutex_lock(&tz->lock);
 
-	ret = tz->ops->get_crit_temp(tz, &temperature);
+	ret = tz->ops.get_crit_temp(tz, &temperature);
 
 	mutex_unlock(&tz->lock);
 
@@ -132,7 +132,7 @@ thermal_hwmon_lookup_temp(const struct t
 static bool thermal_zone_crit_temp_valid(struct thermal_zone_device *tz)
 {
 	int temp;
-	return tz->ops->get_crit_temp && !tz->ops->get_crit_temp(tz, &temp);
+	return tz->ops.get_crit_temp && !tz->ops.get_crit_temp(tz, &temp);
 }
 
 int thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
Index: linux-pm/drivers/thermal/thermal_of.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_of.c
+++ linux-pm/drivers/thermal/thermal_of.c
@@ -441,12 +441,10 @@ static int thermal_of_unbind(struct ther
 static void thermal_of_zone_unregister(struct thermal_zone_device *tz)
 {
 	struct thermal_trip *trips = tz->trips;
-	struct thermal_zone_device_ops *ops = tz->ops;
 
 	thermal_zone_device_disable(tz);
 	thermal_zone_device_unregister(tz);
 	kfree(trips);
-	kfree(ops);
 }
 
 /**
@@ -472,33 +470,27 @@ static void thermal_of_zone_unregister(s
 static struct thermal_zone_device *thermal_of_zone_register(struct device_node *sensor, int id, void *data,
 							    const struct thermal_zone_device_ops *ops)
 {
+	struct thermal_zone_device_ops of_ops = *ops;
 	struct thermal_zone_device *tz;
 	struct thermal_trip *trips;
 	struct thermal_zone_params tzp = {};
-	struct thermal_zone_device_ops *of_ops;
 	struct device_node *np;
 	const char *action;
 	int delay, pdelay;
 	int ntrips;
 	int ret;
 
-	of_ops = kmemdup(ops, sizeof(*ops), GFP_KERNEL);
-	if (!of_ops)
-		return ERR_PTR(-ENOMEM);
-
 	np = of_thermal_zone_find(sensor, id);
 	if (IS_ERR(np)) {
 		if (PTR_ERR(np) != -ENODEV)
 			pr_err("Failed to find thermal zone for %pOFn id=%d\n", sensor, id);
-		ret = PTR_ERR(np);
-		goto out_kfree_of_ops;
+		return ERR_CAST(np);
 	}
 
 	trips = thermal_of_trips_init(np, &ntrips);
 	if (IS_ERR(trips)) {
 		pr_err("Failed to find trip points for %pOFn id=%d\n", sensor, id);
-		ret = PTR_ERR(trips);
-		goto out_kfree_of_ops;
+		return ERR_CAST(trips);
 	}
 
 	ret = thermal_of_monitor_init(np, &delay, &pdelay);
@@ -509,16 +501,16 @@ static struct thermal_zone_device *therm
 
 	thermal_of_parameters_init(np, &tzp);
 
-	of_ops->bind = thermal_of_bind;
-	of_ops->unbind = thermal_of_unbind;
+	of_ops.bind = thermal_of_bind;
+	of_ops.unbind = thermal_of_unbind;
 
 	ret = of_property_read_string(np, "critical-action", &action);
 	if (!ret)
-		if (!of_ops->critical && !strcasecmp(action, "reboot"))
-			of_ops->critical = thermal_zone_device_critical_reboot;
+		if (!of_ops.critical && !strcasecmp(action, "reboot"))
+			of_ops.critical = thermal_zone_device_critical_reboot;
 
 	tz = thermal_zone_device_register_with_trips(np->name, trips, ntrips,
-						     data, of_ops, &tzp,
+						     data, &of_ops, &tzp,
 						     pdelay, delay);
 	if (IS_ERR(tz)) {
 		ret = PTR_ERR(tz);
@@ -538,8 +530,6 @@ static struct thermal_zone_device *therm
 
 out_kfree_trips:
 	kfree(trips);
-out_kfree_of_ops:
-	kfree(of_ops);
 
 	return ERR_PTR(ret);
 }

Re: [PATCH v2 4/6] thermal: core: Store zone ops in struct thermal_zone_device

[Daniel Lezcano]

On 14/02/2024 13:45, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> 
> The current code requires thermal zone creators to pass pointers to
> writable ops structures to thermal_zone_device_register_with_trips()
> which needs to modify the target struct thermal_zone_device_ops object
> if the "critical" operation in it is NULL.
> 
> Moreover, the callers of thermal_zone_device_register_with_trips() are
> required to hold on to the struct thermal_zone_device_ops object passed
> to it until the given thermal zone is unregistered.
> 
> Both of these requirements are quite inconvenient, so modify struct
> thermal_zone_device to contain struct thermal_zone_device_ops as field and
> make thermal_zone_device_register_with_trips() copy the contents of the
> struct thermal_zone_device_ops passed to it via a pointer (which can be
> const now) to that field.
> 
> Also adjust the code using thermal zone ops accordingly and modify
> thermal_of_zone_register() to use a local ops variable during
> thermal zone registration so ops do not need to be freed in
> thermal_of_zone_unregister() any more.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
> ---

Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>


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Re: [PATCH v2 4/6] thermal: core: Store zone ops in struct thermal_zone_device

[Daniel Lezcano]

On 14/02/2024 13:45, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> 
> The current code requires thermal zone creators to pass pointers to
> writable ops structures to thermal_zone_device_register_with_trips()
> which needs to modify the target struct thermal_zone_device_ops object
> if the "critical" operation in it is NULL.
> 
> Moreover, the callers of thermal_zone_device_register_with_trips() are
> required to hold on to the struct thermal_zone_device_ops object passed
> to it until the given thermal zone is unregistered.
> 
> Both of these requirements are quite inconvenient, so modify struct
> thermal_zone_device to contain struct thermal_zone_device_ops as field and
> make thermal_zone_device_register_with_trips() copy the contents of the
> struct thermal_zone_device_ops passed to it via a pointer (which can be
> const now) to that field.
> 
> Also adjust the code using thermal zone ops accordingly and modify
> thermal_of_zone_register() to use a local ops variable during
> thermal zone registration so ops do not need to be freed in
> thermal_of_zone_unregister() any more.

[ ... ]

>   static void thermal_of_zone_unregister(struct thermal_zone_device *tz)
>   {
>   	struct thermal_trip *trips = tz->trips;
> -	struct thermal_zone_device_ops *ops = tz->ops;
>   
>   	thermal_zone_device_disable(tz);
>   	thermal_zone_device_unregister(tz);
>   	kfree(trips);

Not related to the current patch but with patch 1/6. Freeing the trip 
points here will lead to a double free given it is already freed from 
thermal_zone_device_unregister() after the changes introduces in patch 
1, right ?


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Re: [PATCH v2 4/6] thermal: core: Store zone ops in struct thermal_zone_device

[Rafael J. Wysocki]

On Thu, Feb 22, 2024 at 11:47 AM Daniel Lezcano
<daniel.lezcano@linaro.org> wrote:
>
> On 14/02/2024 13:45, Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> >
> > The current code requires thermal zone creators to pass pointers to
> > writable ops structures to thermal_zone_device_register_with_trips()
> > which needs to modify the target struct thermal_zone_device_ops object
> > if the "critical" operation in it is NULL.
> >
> > Moreover, the callers of thermal_zone_device_register_with_trips() are
> > required to hold on to the struct thermal_zone_device_ops object passed
> > to it until the given thermal zone is unregistered.
> >
> > Both of these requirements are quite inconvenient, so modify struct
> > thermal_zone_device to contain struct thermal_zone_device_ops as field and
> > make thermal_zone_device_register_with_trips() copy the contents of the
> > struct thermal_zone_device_ops passed to it via a pointer (which can be
> > const now) to that field.
> >
> > Also adjust the code using thermal zone ops accordingly and modify
> > thermal_of_zone_register() to use a local ops variable during
> > thermal zone registration so ops do not need to be freed in
> > thermal_of_zone_unregister() any more.
>
> [ ... ]
>
> >   static void thermal_of_zone_unregister(struct thermal_zone_device *tz)
> >   {
> >       struct thermal_trip *trips = tz->trips;
> > -     struct thermal_zone_device_ops *ops = tz->ops;
> >
> >       thermal_zone_device_disable(tz);
> >       thermal_zone_device_unregister(tz);
> >       kfree(trips);
>
> Not related to the current patch but with patch 1/6. Freeing the trip
> points here will lead to a double free given it is already freed from
> thermal_zone_device_unregister() after the changes introduces in patch
> 1, right ?

No, patch [1/6] doesn't free the caller-supplied ops, just copies them
into the local instance.  Attempting to free a static ops would not be
a good idea, for example.

BTW, thanks for all of the reviews, but this series is not applicable
without the one at

https://lore.kernel.org/linux-pm/6017196.lOV4Wx5bFT@kreacher/

Re: [PATCH v2 4/6] thermal: core: Store zone ops in struct thermal_zone_device

[Daniel Lezcano]

On 22/02/2024 11:52, Rafael J. Wysocki wrote:
> On Thu, Feb 22, 2024 at 11:47 AM Daniel Lezcano
> <daniel.lezcano@linaro.org> wrote:
>>
>> On 14/02/2024 13:45, Rafael J. Wysocki wrote:
>>> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
>>>
>>> The current code requires thermal zone creators to pass pointers to
>>> writable ops structures to thermal_zone_device_register_with_trips()
>>> which needs to modify the target struct thermal_zone_device_ops object
>>> if the "critical" operation in it is NULL.
>>>
>>> Moreover, the callers of thermal_zone_device_register_with_trips() are
>>> required to hold on to the struct thermal_zone_device_ops object passed
>>> to it until the given thermal zone is unregistered.
>>>
>>> Both of these requirements are quite inconvenient, so modify struct
>>> thermal_zone_device to contain struct thermal_zone_device_ops as field and
>>> make thermal_zone_device_register_with_trips() copy the contents of the
>>> struct thermal_zone_device_ops passed to it via a pointer (which can be
>>> const now) to that field.
>>>
>>> Also adjust the code using thermal zone ops accordingly and modify
>>> thermal_of_zone_register() to use a local ops variable during
>>> thermal zone registration so ops do not need to be freed in
>>> thermal_of_zone_unregister() any more.
>>
>> [ ... ]
>>
>>>    static void thermal_of_zone_unregister(struct thermal_zone_device *tz)
>>>    {
>>>        struct thermal_trip *trips = tz->trips;
>>> -     struct thermal_zone_device_ops *ops = tz->ops;
>>>
>>>        thermal_zone_device_disable(tz);
>>>        thermal_zone_device_unregister(tz);
>>>        kfree(trips);
>>
>> Not related to the current patch but with patch 1/6. Freeing the trip
>> points here will lead to a double free given it is already freed from
>> thermal_zone_device_unregister() after the changes introduces in patch
>> 1, right ?
> 
> No, patch [1/6] doesn't free the caller-supplied ops, just copies them
> into the local instance.  Attempting to free a static ops would not be
> a good idea, for example.

I'm referring to the trip points not the ops.

The patch 1 does:

tz = kzalloc(struct_size(tz, trips, num_trips), GFP_KERNEL);

Then the last line of thermal_zone_device_unregister() does:

kfree(tz);

That includes the trip points in the flexible array.

Now in thermal_of_zone_unregister(), we do:

trips = tz->trips;
thermal_zone_device_unregister(tz);
kfree(trips);

Hence double kfree, right?



> BTW, thanks for all of the reviews, but this series is not applicable
> without the one at
> 
> https://lore.kernel.org/linux-pm/6017196.lOV4Wx5bFT@kreacher/



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Re: [PATCH v2 4/6] thermal: core: Store zone ops in struct thermal_zone_device

[Rafael J. Wysocki]

On Thu, Feb 22, 2024 at 11:58 AM Daniel Lezcano
<daniel.lezcano@linaro.org> wrote:
>
> On 22/02/2024 11:52, Rafael J. Wysocki wrote:
> > On Thu, Feb 22, 2024 at 11:47 AM Daniel Lezcano
> > <daniel.lezcano@linaro.org> wrote:
> >>
> >> On 14/02/2024 13:45, Rafael J. Wysocki wrote:
> >>> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> >>>
> >>> The current code requires thermal zone creators to pass pointers to
> >>> writable ops structures to thermal_zone_device_register_with_trips()
> >>> which needs to modify the target struct thermal_zone_device_ops object
> >>> if the "critical" operation in it is NULL.
> >>>
> >>> Moreover, the callers of thermal_zone_device_register_with_trips() are
> >>> required to hold on to the struct thermal_zone_device_ops object passed
> >>> to it until the given thermal zone is unregistered.
> >>>
> >>> Both of these requirements are quite inconvenient, so modify struct
> >>> thermal_zone_device to contain struct thermal_zone_device_ops as field and
> >>> make thermal_zone_device_register_with_trips() copy the contents of the
> >>> struct thermal_zone_device_ops passed to it via a pointer (which can be
> >>> const now) to that field.
> >>>
> >>> Also adjust the code using thermal zone ops accordingly and modify
> >>> thermal_of_zone_register() to use a local ops variable during
> >>> thermal zone registration so ops do not need to be freed in
> >>> thermal_of_zone_unregister() any more.
> >>
> >> [ ... ]
> >>
> >>>    static void thermal_of_zone_unregister(struct thermal_zone_device *tz)
> >>>    {
> >>>        struct thermal_trip *trips = tz->trips;
> >>> -     struct thermal_zone_device_ops *ops = tz->ops;
> >>>
> >>>        thermal_zone_device_disable(tz);
> >>>        thermal_zone_device_unregister(tz);
> >>>        kfree(trips);
> >>
> >> Not related to the current patch but with patch 1/6. Freeing the trip
> >> points here will lead to a double free given it is already freed from
> >> thermal_zone_device_unregister() after the changes introduces in patch
> >> 1, right ?
> >
> > No, patch [1/6] doesn't free the caller-supplied ops, just copies them
> > into the local instance.  Attempting to free a static ops would not be
> > a good idea, for example.
>
> I'm referring to the trip points not the ops.

Ah, sorry for the confusion.

> The patch 1 does:
>
> tz = kzalloc(struct_size(tz, trips, num_trips), GFP_KERNEL);
>
> Then the last line of thermal_zone_device_unregister() does:
>
> kfree(tz);
>
> That includes the trip points in the flexible array.

Right.

> Now in thermal_of_zone_unregister(), we do:
>
> trips = tz->trips;

I missed this.

> thermal_zone_device_unregister(tz);
> kfree(trips);
>
> Hence double kfree, right?

Indeed, so patch [1/6] is missing a thermal_of change to stop freeing
trips separately.  Let me send an update of just that patch.

Re: [PATCH v2 4/6] thermal: core: Store zone ops in struct thermal_zone_device

[Rafael J. Wysocki]

On Thu, Feb 22, 2024 at 11:52 AM Rafael J. Wysocki <rafael@kernel.org> wrote:
>
> On Thu, Feb 22, 2024 at 11:47 AM Daniel Lezcano
> <daniel.lezcano@linaro.org> wrote:
> >
> > On 14/02/2024 13:45, Rafael J. Wysocki wrote:
> > > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> > >
> > > The current code requires thermal zone creators to pass pointers to
> > > writable ops structures to thermal_zone_device_register_with_trips()
> > > which needs to modify the target struct thermal_zone_device_ops object
> > > if the "critical" operation in it is NULL.
> > >
> > > Moreover, the callers of thermal_zone_device_register_with_trips() are
> > > required to hold on to the struct thermal_zone_device_ops object passed
> > > to it until the given thermal zone is unregistered.
> > >
> > > Both of these requirements are quite inconvenient, so modify struct
> > > thermal_zone_device to contain struct thermal_zone_device_ops as field and
> > > make thermal_zone_device_register_with_trips() copy the contents of the
> > > struct thermal_zone_device_ops passed to it via a pointer (which can be
> > > const now) to that field.
> > >
> > > Also adjust the code using thermal zone ops accordingly and modify
> > > thermal_of_zone_register() to use a local ops variable during
> > > thermal zone registration so ops do not need to be freed in
> > > thermal_of_zone_unregister() any more.
> >
> > [ ... ]
> >
> > >   static void thermal_of_zone_unregister(struct thermal_zone_device *tz)
> > >   {
> > >       struct thermal_trip *trips = tz->trips;
> > > -     struct thermal_zone_device_ops *ops = tz->ops;
> > >
> > >       thermal_zone_device_disable(tz);
> > >       thermal_zone_device_unregister(tz);
> > >       kfree(trips);
> >
> > Not related to the current patch but with patch 1/6. Freeing the trip
> > points here will lead to a double free given it is already freed from
> > thermal_zone_device_unregister() after the changes introduces in patch
> > 1, right ?
>
> No, patch [1/6] doesn't free the caller-supplied ops, just copies them
> into the local instance.  Attempting to free a static ops would not be
> a good idea, for example.
>
> BTW, thanks for all of the reviews, but this series is not applicable
> without the one at
>
> https://lore.kernel.org/linux-pm/6017196.lOV4Wx5bFT@kreacher/

As it turns out, this really is not a big deal, because the rebase is
trivial for everything except for the Intel patches, but for those two
I have the v1 versions that apply just fine without the other series
and have been reviewed.

So I can apply this series before the above one and rebase the latter
(I'd rather not send a new version of it though, so it can be reviewed
as is).

So never mind.

[PATCH v2 5/6] thermal: ACPI: Constify acpi_thermal_zone_ops

[Rafael J. Wysocki]

From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Because thermal zone operations are now stored directly in struct
thermal_zone_device, acpi_thermal_zone_ops need not be modified by
the thermal core and so it can be const.

Adjust the code accordingly.

No functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

v1 -> v2: No changes.

---
 drivers/acpi/thermal.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-pm/drivers/acpi/thermal.c
===================================================================
--- linux-pm.orig/drivers/acpi/thermal.c
+++ linux-pm/drivers/acpi/thermal.c
@@ -620,7 +620,7 @@ acpi_thermal_unbind_cooling_device(struc
 	return acpi_thermal_bind_unbind_cdev(thermal, cdev, false);
 }
 
-static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
+static const 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,

Re: [PATCH v2 5/6] thermal: ACPI: Constify acpi_thermal_zone_ops

[Daniel Lezcano]

On 14/02/2024 13:48, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> 
> Because thermal zone operations are now stored directly in struct
> thermal_zone_device, acpi_thermal_zone_ops need not be modified by
> the thermal core and so it can be const.
> 
> Adjust the code accordingly.
> 
> No functional impact.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> ---

Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>

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[PATCH v2 6/6] thermal: intel: Adjust ops handling during thermal zone registration

[Rafael J. Wysocki]

From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Because thermal zone operations are now stored directly in struct
thermal_zone_device, thermal zone creators can discard the operations
structure after the zone registration is complete, or it can be made
read-only.

Accordingly, make int340x_thermal_zone_add() use a local variable to
represent thermal zone operations, so it is freed automatically upon the
function exit, and make the other Intel thermal drivers use const zone
operations structures.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
---

v1 -> v2:
   * Rebase.
   * Add R-by from Stanislaw.

---
 drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c         |   26 ++--------
 drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.h         |    1 
 drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c |    2 
 drivers/thermal/intel/intel_pch_thermal.c                            |    2 
 drivers/thermal/intel/intel_quark_dts_thermal.c                      |    2 
 drivers/thermal/intel/intel_soc_dts_iosf.c                           |    2 
 drivers/thermal/intel/x86_pkg_temp_thermal.c                         |    2 
 7 files changed, 11 insertions(+), 26 deletions(-)

Index: linux-pm/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c
===================================================================
--- linux-pm.orig/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c
+++ linux-pm/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c
@@ -61,12 +61,6 @@ static void int340x_thermal_critical(str
 	dev_dbg(&zone->device, "%s: critical temperature reached\n", zone->type);
 }
 
-static struct thermal_zone_device_ops int340x_thermal_zone_ops = {
-	.get_temp       = int340x_thermal_get_zone_temp,
-	.set_trip_temp	= int340x_thermal_set_trip_temp,
-	.critical	= int340x_thermal_critical,
-};
-
 static inline void *int_to_trip_priv(int i)
 {
 	return (void *)(long)i;
@@ -126,6 +120,11 @@ static struct thermal_zone_params int340
 struct int34x_thermal_zone *int340x_thermal_zone_add(struct acpi_device *adev,
 						     int (*get_temp) (struct thermal_zone_device *, int *))
 {
+	const struct thermal_zone_device_ops zone_ops = {
+		.set_trip_temp = int340x_thermal_set_trip_temp,
+		.critical = int340x_thermal_critical,
+		.get_temp = get_temp ? get_temp : int340x_thermal_get_zone_temp,
+	};
 	struct int34x_thermal_zone *int34x_zone;
 	struct thermal_trip *zone_trips;
 	unsigned long long trip_cnt = 0;
@@ -139,16 +138,6 @@ struct int34x_thermal_zone *int340x_ther
 
 	int34x_zone->adev = adev;
 
-	int34x_zone->ops = kmemdup(&int340x_thermal_zone_ops,
-				   sizeof(int340x_thermal_zone_ops), GFP_KERNEL);
-	if (!int34x_zone->ops) {
-		ret = -ENOMEM;
-		goto err_ops_alloc;
-	}
-
-	if (get_temp)
-		int34x_zone->ops->get_temp = get_temp;
-
 	status = acpi_evaluate_integer(adev->handle, "PATC", NULL, &trip_cnt);
 	if (ACPI_SUCCESS(status))
 		int34x_zone->aux_trip_nr = trip_cnt;
@@ -183,7 +172,7 @@ struct int34x_thermal_zone *int340x_ther
 							acpi_device_bid(adev),
 							zone_trips, trip_cnt,
 							int34x_zone,
-							int34x_zone->ops,
+							&zone_ops,
 							&int340x_thermal_params,
 							0, 0);
 	kfree(zone_trips);
@@ -203,8 +192,6 @@ err_enable:
 err_thermal_zone:
 	acpi_lpat_free_conversion_table(int34x_zone->lpat_table);
 err_trips_alloc:
-	kfree(int34x_zone->ops);
-err_ops_alloc:
 	kfree(int34x_zone);
 	return ERR_PTR(ret);
 }
@@ -214,7 +201,6 @@ void int340x_thermal_zone_remove(struct
 {
 	thermal_zone_device_unregister(int34x_zone->zone);
 	acpi_lpat_free_conversion_table(int34x_zone->lpat_table);
-	kfree(int34x_zone->ops);
 	kfree(int34x_zone);
 }
 EXPORT_SYMBOL_GPL(int340x_thermal_zone_remove);
Index: linux-pm/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.h
===================================================================
--- linux-pm.orig/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.h
+++ linux-pm/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.h
@@ -22,7 +22,6 @@ struct int34x_thermal_zone {
 	struct acpi_device *adev;
 	int aux_trip_nr;
 	struct thermal_zone_device *zone;
-	struct thermal_zone_device_ops *ops;
 	void *priv_data;
 	struct acpi_lpat_conversion_table *lpat_table;
 };
Index: linux-pm/drivers/thermal/intel/intel_pch_thermal.c
===================================================================
--- linux-pm.orig/drivers/thermal/intel/intel_pch_thermal.c
+++ linux-pm/drivers/thermal/intel/intel_pch_thermal.c
@@ -132,7 +132,7 @@ static void pch_critical(struct thermal_
 		thermal_zone_device_type(tzd));
 }
 
-static struct thermal_zone_device_ops tzd_ops = {
+static const struct thermal_zone_device_ops tzd_ops = {
 	.get_temp = pch_thermal_get_temp,
 	.critical = pch_critical,
 };
Index: linux-pm/drivers/thermal/intel/intel_quark_dts_thermal.c
===================================================================
--- linux-pm.orig/drivers/thermal/intel/intel_quark_dts_thermal.c
+++ linux-pm/drivers/thermal/intel/intel_quark_dts_thermal.c
@@ -288,7 +288,7 @@ static int sys_change_mode(struct therma
 	return ret;
 }
 
-static struct thermal_zone_device_ops tzone_ops = {
+static const struct thermal_zone_device_ops tzone_ops = {
 	.get_temp = sys_get_curr_temp,
 	.set_trip_temp = sys_set_trip_temp,
 	.change_mode = sys_change_mode,
Index: linux-pm/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c
===================================================================
--- linux-pm.orig/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c
+++ linux-pm/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c
@@ -233,7 +233,7 @@ static int get_trip_temp(struct proc_the
 	return temp;
 }
 
-static struct thermal_zone_device_ops tzone_ops = {
+static const struct thermal_zone_device_ops tzone_ops = {
 	.get_temp = sys_get_curr_temp,
 	.set_trip_temp	= sys_set_trip_temp,
 };
Index: linux-pm/drivers/thermal/intel/intel_soc_dts_iosf.c
===================================================================
--- linux-pm.orig/drivers/thermal/intel/intel_soc_dts_iosf.c
+++ linux-pm/drivers/thermal/intel/intel_soc_dts_iosf.c
@@ -168,7 +168,7 @@ static int sys_get_curr_temp(struct ther
 	return 0;
 }
 
-static struct thermal_zone_device_ops tzone_ops = {
+static const struct thermal_zone_device_ops tzone_ops = {
 	.get_temp = sys_get_curr_temp,
 	.set_trip_temp = sys_set_trip_temp,
 };
Index: linux-pm/drivers/thermal/intel/x86_pkg_temp_thermal.c
===================================================================
--- linux-pm.orig/drivers/thermal/intel/x86_pkg_temp_thermal.c
+++ linux-pm/drivers/thermal/intel/x86_pkg_temp_thermal.c
@@ -166,7 +166,7 @@ sys_set_trip_temp(struct thermal_zone_de
 }
 
 /* Thermal zone callback registry */
-static struct thermal_zone_device_ops tzone_ops = {
+static const struct thermal_zone_device_ops tzone_ops = {
 	.get_temp = sys_get_curr_temp,
 	.set_trip_temp = sys_set_trip_temp,
 };

Re: [PATCH v2 6/6] thermal: intel: Adjust ops handling during thermal zone registration

[Daniel Lezcano]

On 14/02/2024 13:49, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> 
> Because thermal zone operations are now stored directly in struct
> thermal_zone_device, thermal zone creators can discard the operations
> structure after the zone registration is complete, or it can be made
> read-only.
> 
> Accordingly, make int340x_thermal_zone_add() use a local variable to
> represent thermal zone operations, so it is freed automatically upon the
> function exit, and make the other Intel thermal drivers use const zone
> operations structures.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>

Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>

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