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Subject[PATCH 3.12 114/124] thermal: step_wise: fix: Prevent from binary overflow when trend is dropping
Date
From: Lukasz Majewski <l.majewski@samsung.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@samsung.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Cc: Mason <slash.tmp@free.fr>
Signed-off-by: Jiri Slaby <jslaby@suse.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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