linux-kernel - [PATCH 3.12 114/124] thermal: step_wise: fix: Prevent from binary overflow when trend is dropping

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Message-Id: <928f39912355b55521452cb6491fe0c0bd39c3f5.1438076484.git.jslaby@suse.cz>
Date:	Tue, 28 Jul 2015 11:52:55 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Lukasz Majewski <l.majewski@...sung.com>,
	Zhang Rui <rui.zhang@...el.com>, Mason <slash.tmp@...e.fr>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 114/124] thermal: step_wise: fix: Prevent from binary overflow when trend is dropping

From: Lukasz Majewski <l.majewski@...sung.com>

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

===============

commit 26bb0e9a1a938ec98ee07aa76533f1a711fba706 upstream.

It turns out that some boards can have instance->lower greater than 0 and
when thermal trend is dropping it results with next_target equal to -1.

Since the next_target is defined as unsigned long it is interpreted as
0xFFFFFFFF and larger than instance->upper.
As a result the next_target is set to instance->upper which ramps up to
maximal cooling device target when the temperature is steadily decreasing.

Signed-off-by: Lukasz Majewski <l.majewski@...sung.com>
Signed-off-by: Zhang Rui <rui.zhang@...el.com>
Cc: Mason <slash.tmp@...e.fr>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/thermal/step_wise.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/thermal/step_wise.c b/drivers/thermal/step_wise.c
index 769bfa3a4360..26d3aff18277 100644
--- a/drivers/thermal/step_wise.c
+++ b/drivers/thermal/step_wise.c
@@ -75,7 +75,7 @@ static unsigned long get_target_state(struct thermal_instance *instance,
 			next_target = instance->upper;
 		break;
 	case THERMAL_TREND_DROPPING:
-		if (cur_state == instance->lower) {
+		if (cur_state <= instance->lower) {
 			if (!throttle)
 				next_target = THERMAL_NO_TARGET;
 		} else {
-- 
2.4.6

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