This is a note to let you know that I've just added the patch titled
thermal/of: Fix cdev lookup in thermal_of_should_bind()
to the 6.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
thermal-of-fix-cdev-lookup-in-thermal_of_should_bind.patch
and it can be found in the queue-6.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a750b19e95f0c2b68af962366ac3fec765725b64
Author: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Date: Fri Feb 21 17:57:11 2025 +0100
thermal/of: Fix cdev lookup in thermal_of_should_bind()
[ Upstream commit 423de5b5bc5b267586b449abd1c4fde562aa0cf9 ]
Since thermal_of_should_bind() terminates the loop after processing
the first child found in cooling-maps, it will never match more than
one cdev to a given trip point which is incorrect, as there may be
cooling-maps associating one trip point with multiple cooling devices.
Address this by letting the loop continue until either all
children have been processed or a matching one has been found.
To avoid adding conditionals or goto statements, put the loop in
question into a separate function and make that function return
right away after finding a matching cooling-maps entry.
Fixes: 94c6110b0b13 ("thermal/of: Use the .should_bind() thermal zone callback")
Link: https://lore.kernel.org/linux-pm/20250219-fix-thermal-of-v1-1-de36e7a590c4@xxxxxxxxxxxx/
Reported-by: Yu-Che Cheng <giver@xxxxxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Reviewed-by: Yu-Che Cheng <giver@xxxxxxxxxxxx>
Tested-by: Yu-Che Cheng <giver@xxxxxxxxxxxx>
Reviewed-by: Lukasz Luba <lukasz.luba@xxxxxxx>
Tested-by: Lukasz Luba <lukasz.luba@xxxxxxx>
Link: https://patch.msgid.link/2788228.mvXUDI8C0e@xxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
index 111d2c15601b9..e0aa9d9d5604b 100644
--- a/drivers/thermal/thermal_of.c
+++ b/drivers/thermal/thermal_of.c
@@ -293,6 +293,34 @@ static bool thermal_of_get_cooling_spec(struct device_node *map_np, int index,
return true;
}
+static bool thermal_of_cm_lookup(struct device_node *cm_np,
+ const struct thermal_trip *trip,
+ struct thermal_cooling_device *cdev,
+ struct cooling_spec *c)
+{
+ for_each_child_of_node_scoped(cm_np, child) {
+ struct device_node *tr_np;
+ int count, i;
+
+ tr_np = of_parse_phandle(child, "trip", 0);
+ if (tr_np != trip->priv)
+ continue;
+
+ /* The trip has been found, look up the cdev. */
+ count = of_count_phandle_with_args(child, "cooling-device",
+ "#cooling-cells");
+ if (count <= 0)
+ pr_err("Add a cooling_device property with at least one device\n");
+
+ for (i = 0; i < count; i++) {
+ if (thermal_of_get_cooling_spec(child, i, cdev, c))
+ return true;
+ }
+ }
+
+ return false;
+}
+
static bool thermal_of_should_bind(struct thermal_zone_device *tz,
const struct thermal_trip *trip,
struct thermal_cooling_device *cdev,
@@ -312,27 +340,7 @@ static bool thermal_of_should_bind(struct thermal_zone_device *tz,
goto out;
/* Look up the trip and the cdev in the cooling maps. */
- for_each_child_of_node_scoped(cm_np, child) {
- struct device_node *tr_np;
- int count, i;
-
- tr_np = of_parse_phandle(child, "trip", 0);
- if (tr_np != trip->priv)
- continue;
-
- /* The trip has been found, look up the cdev. */
- count = of_count_phandle_with_args(child, "cooling-device", "#cooling-cells");
- if (count <= 0)
- pr_err("Add a cooling_device property with at least one device\n");
-
- for (i = 0; i < count; i++) {
- result = thermal_of_get_cooling_spec(child, i, cdev, c);
- if (result)
- break;
- }
-
- break;
- }
+ result = thermal_of_cm_lookup(cm_np, trip, cdev, c);
of_node_put(cm_np);
out:
