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| author |   Lukasz Majewski <l.majewski@samsung.com> | 2014-09-24 10:27:10 +0200 |
|---|---|---|
| committer |   Zhang Rui <rui.zhang@intel.com> | 2014-10-09 10:44:01 +0800 |
| commit | 26bb0e9a1a938ec98ee07aa76533f1a711fba706 (patch) | |
| tree | 0f17deb50d1cbfd45060c1da59d864ac143bdbfd /drivers/thermal/step_wise.c | |
| parent | Linux 3.17-rc2 (diff) | |
| download | linux-dev-26bb0e9a1a938ec98ee07aa76533f1a711fba706.tar.xz linux-dev-26bb0e9a1a938ec98ee07aa76533f1a711fba706.zip | |
thermal: step_wise: fix: Prevent from binary overflow when trend is dropping
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>
Diffstat (limited to 'drivers/thermal/step_wise.c')
| -rw-r--r-- | drivers/thermal/step_wise.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/thermal/step_wise.c b/drivers/thermal/step_wise.c index f251521baaa2..6705a0d746b3 100644 --- a/drivers/thermal/step_wise.c +++ b/drivers/thermal/step_wise.c @@ -76,7 +76,7 @@ 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 { |