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jz4740-battery: Correct voltage change check

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The check is supposed to avoid redundant update notifications, so it
should check for the difference between old and new voltage exceeding
a threshold.

Also make sure the result of a failed read is never stored.

Signed-off-by: Maarten ter Huurne <[email protected]>
Signed-off-by: Sebastian Reichel <[email protected]>
This commit is contained in:
Maarten ter Huurne 2016-02-28 17:05:48 +01:00 • committed by Sebastian Reichel
commit 754645342a
1 changed files with 1 additions and 1 deletions
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2
drivers/power/jz4740-battery.c
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@ -208,7 +208,7 @@ static void jz_battery_update(struct jz_battery *jz_battery)
}
voltage = jz_battery_read_voltage(jz_battery);
if (abs(voltage - jz_battery->voltage) < 50000) {
if (voltage >= 0 && abs(voltage - jz_battery->voltage) > 50000) {
jz_battery->voltage = voltage;
has_changed = true;
}