ds2760_battery: Fix integer overflow for time_to_empty_now
On the device we're currently developing, battery sizes of ~2.8Ah and
current flow of ~600mA are typical.
With that values, the life_sec computation overflows due to the
multiplication by 3600.
Signed-off-by: Daniel Mack <daniel@caiaq.de>
Cc: Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>
Cc: Matt Reimer <mreimer@vpop.net>
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
diff --git a/drivers/power/ds2760_battery.c b/drivers/power/ds2760_battery.c
index 1bb8498..6f1dba5 100644
--- a/drivers/power/ds2760_battery.c
+++ b/drivers/power/ds2760_battery.c
@@ -211,9 +211,9 @@
if (di->rem_capacity > 100)
di->rem_capacity = 100;
- if (di->current_uA)
- di->life_sec = -((di->accum_current_uAh - di->empty_uAh) *
- 3600L) / di->current_uA;
+ if (di->current_uA >= 100L)
+ di->life_sec = -((di->accum_current_uAh - di->empty_uAh) * 36L)
+ / (di->current_uA / 100L);
else
di->life_sec = 0;