During boot I get a div by zero Oops regression starting in v4.3-rc3.
Reviewed-by: Javi Merino <[email protected]>
Signed-off-by: Andrea Arcangeli <[email protected]>
---
drivers/thermal/power_allocator.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/thermal/power_allocator.c
b/drivers/thermal/power_allocator.c
index 7ff9627..e570ff0 100644
--- a/drivers/thermal/power_allocator.c
+++ b/drivers/thermal/power_allocator.c
@@ -144,6 +144,16 @@ static void estimate_pid_constants(struct
thermal_zone_device *tz,
switch_on_temp = 0;
temperature_threshold = control_temp - switch_on_temp;
+ /*
+ * estimate_pid_constants() tries to find appropriate default
+ * values for thermal zones that don't provide them. If a
+ * system integrator has configured a thermal zone with two
+ * passive trip points at the same temperature, that person
+ * hasn't put any effort to set up the thermal zone properly
+ * so just give up.
+ */
+ if (!temperature_threshold)
+ return;
if (!tz->tzp->k_po || force)
tz->tzp->k_po = int_to_frac(sustainable_power) /
--
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