From: Roland Dreier Date: Wed, 7 Nov 2007 23:09:09 +0000 (-0800) Subject: ACPI: Always return valid 'status' from acpi_battery_get_property() X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=4c41d3ad6544f1c9aec37c441af04f5d0ad3a731;p=deliverable%2Flinux.git ACPI: Always return valid 'status' from acpi_battery_get_property() If a battery is at a critical charge level and not being charged or discharged, then the ACPI _BST method will return a state of 4, and the current acpi_battery_get_property() code will not set any property value for POWER_SUPPLY_PROP_STATUS. This will cause an oops in power_supply_show_property() when it reads off the end of the status_text array. This actually was causing a 100% reproducible crash on boot on my laptop with two batteries, when one battery was completely drained and the laptop was not plugged in. Fix this by making sure acpi_battery_get_property() returns POWER_SUPPLY_STATUS_UNKNOWN for any battery state it doesn't already handle explicitly. There doesn't seem to be any status enum value defined that makes more sense than 'unknown' for a battery at a critical charge level. Signed-off-by: Roland Dreier Acked-by: Alexey Starikovskiy Signed-off-by: Len Brown --- diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c index c2ce0ad21693..cbb27b4ddea4 100644 --- a/drivers/acpi/battery.c +++ b/drivers/acpi/battery.c @@ -152,6 +152,8 @@ static int acpi_battery_get_property(struct power_supply *psy, val->intval = POWER_SUPPLY_STATUS_CHARGING; else if (battery->state == 0) val->intval = POWER_SUPPLY_STATUS_FULL; + else + val->intval = POWER_SUPPLY_STATUS_UNKNOWN; break; case POWER_SUPPLY_PROP_PRESENT: val->intval = acpi_battery_present(battery);