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authorDaniel Mack <daniel@caiaq.de>2009-07-24 15:08:11 +0200
committerAnton Vorontsov <avorontsov@ru.mvista.com>2009-09-04 20:26:40 +0400
commitb0525b48f06714e8d5cf6a3266261b71de8d6dd4 (patch)
treefaef8c88f77b5d1738feb8a57ef154832b764883 /drivers/power/ds2760_battery.c
parent83a8af0d31cfa6c728a68c00f6b1b518e2dcc03d (diff)
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>
Diffstat (limited to 'drivers/power/ds2760_battery.c')
-rw-r--r--drivers/power/ds2760_battery.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/power/ds2760_battery.c b/drivers/power/ds2760_battery.c
index 1bb8498f14be..6f1dba5a519d 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;