ACPI: Battery: remove cycle from battery removal.

get_property() should not call battery_update(), it also should call
get_status() only if battery is present to avoid cycle and oops.

Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Tested-by: Rolf Eike Beer <eike-kernel@sf-tec.de>
Acked-by: Johannes Weiner <hannes@saeurebad.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index c2ce0ad21693c0279adcc2b9529c00b77c4fc0ff..192c244f61902b1e510c41780cd3655d9c7a1756 100644 (file)
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -132,7 +132,7 @@ static int acpi_battery_technology(struct acpi_battery *battery)
        return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 }
 
-static int acpi_battery_update(struct acpi_battery *battery);
+static int acpi_battery_get_state(struct acpi_battery *battery);
 
 static int acpi_battery_get_property(struct power_supply *psy,
                                     enum power_supply_property psp,
@@ -140,10 +140,11 @@ static int acpi_battery_get_property(struct power_supply *psy,
 {
        struct acpi_battery *battery = to_acpi_battery(psy);
 
-       if ((!acpi_battery_present(battery)) &&
-            psp != POWER_SUPPLY_PROP_PRESENT)
+       if (acpi_battery_present(battery)) {
+               /* run battery update only if it is present */
+               acpi_battery_get_state(battery);
+       } else if (psp != POWER_SUPPLY_PROP_PRESENT)
                return -ENODEV;
-       acpi_battery_update(battery);
        switch (psp) {
        case POWER_SUPPLY_PROP_STATUS:
                if (battery->state & 0x01)
@@ -457,6 +458,7 @@ static void sysfs_remove_battery(struct acpi_battery *battery)
                return;
        device_remove_file(battery->bat.dev, &alarm_attr);
        power_supply_unregister(&battery->bat);
+       battery->bat.dev = NULL;
 }
 
 static int acpi_battery_update(struct acpi_battery *battery)