From b0525b48f06714e8d5cf6a3266261b71de8d6dd4 Mon Sep 17 00:00:00 2001 From: Daniel Mack Date: Fri, 24 Jul 2009 15:08:11 +0200 Subject: 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 Cc: Szabolcs Gyurko Cc: Matt Reimer Signed-off-by: Anton Vorontsov --- drivers/power/ds2760_battery.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'drivers/power') diff --git a/drivers/power/ds2760_battery.c b/drivers/power/ds2760_battery.c index 1bb8498f14b..6f1dba5a519 100644 --- a/drivers/power/ds2760_battery.c +++ b/drivers/power/ds2760_battery.c @@ -211,9 +211,9 @@ static int ds2760_battery_read_status(struct ds2760_device_info *di) 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; -- cgit v1.2.3