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Message-Id: <bca746037a308e2fbe742248d34635f07be2bfd9.1433943052.git.jslaby@suse.cz>
Date: Wed, 10 Jun 2015 17:27:05 +0200
From: Jiri Slaby <jslaby@...e.cz>
To: stable@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Jean Delvare <jdelvare@...e.de>
Subject: [PATCH 3.12 076/111] thermal: step_wise: Revert optimization
From: Jean Delvare <jdelvare@...e.de>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
Commit 178c2490b99f898efc06d1ad75cadc84f13021a6 ("thermal: step_wise:
cdev only needs update on a new target state") broke driver acerhdf.
That driver abused the step_wise thermal governor until the bang_bang
governor was available, and the optimization broke this usage model.
Kernels v3.12 to v3.18 are affected. In v3.19 the acerhdf driver was
switched to the bang_bang governor and that solved the problem.
For kernels v3.12 to v3.17, the bang_bang governor isn't available
yet so the easiest fix is to revert the optimization.
Signed-off-by: Jean Delvare <jdelvare@...e.de>
Reported-by: Dieter Jurzitza (https://bugzilla.opensuse.org/show_bug.cgi?id=925961)
Tested-by: Peter Feuerer <peter@...e.net>
Tested-by: Dieter Jurzitza
---
drivers/thermal/step_wise.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/drivers/thermal/step_wise.c b/drivers/thermal/step_wise.c
index d89e781b0a18..769bfa3a4360 100644
--- a/drivers/thermal/step_wise.c
+++ b/drivers/thermal/step_wise.c
@@ -140,9 +140,6 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
old_target = instance->target;
instance->target = get_target_state(instance, trend, throttle);
- if (old_target == instance->target)
- continue;
-
/* Activate a passive thermal instance */
if (old_target == THERMAL_NO_TARGET &&
instance->target != THERMAL_NO_TARGET)
--
2.4.2
--
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