[PATCH 6.8 244/493] thermal/debugfs: Create records for cdev states as they get used

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6.8-stable review patch.  If anyone has any objections, please let me know.

------------------

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

[ Upstream commit f4ae18fcb652c6cccc834ded525ac37f91d5cdb1 ]

Because thermal_debug_cdev_state_update() only creates a duration record
for the old state of a cooling device, if its new state is used for the
first time, there will be no record for it and cdev_dt_seq_show() will
not print the duration information for it even though it contains code
to compute the duration value in that case.

Address this by making thermal_debug_cdev_state_update() create a
duration record for the new state if there is none.

Fixes: 755113d76786 ("thermal/debugfs: Add thermal cooling device debugfs information")
Reported-by: Lukasz Luba <lukasz.luba@xxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Reviewed-by: Lukasz Luba <lukasz.luba@xxxxxxx>
Tested-by: Lukasz Luba <lukasz.luba@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/thermal/thermal_debugfs.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/thermal/thermal_debugfs.c b/drivers/thermal/thermal_debugfs.c
index 47ab95b3699e9..2891d2ab4875c 100644
--- a/drivers/thermal/thermal_debugfs.c
+++ b/drivers/thermal/thermal_debugfs.c
@@ -435,6 +435,14 @@ void thermal_debug_cdev_state_update(const struct thermal_cooling_device *cdev,
 	}
 
 	cdev_dbg->current_state = new_state;
+
+	/*
+	 * Create a record for the new state if it is not there, so its
+	 * duration will be printed by cdev_dt_seq_show() as expected if it
+	 * runs before the next state transition.
+	 */
+	thermal_debugfs_cdev_record_get(thermal_dbg, cdev_dbg->durations, new_state);
+
 	transition = (old_state << 16) | new_state;
 
 	/*
-- 
2.43.0







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