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
