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path: root/drivers/power/jz4740-battery.c
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Diffstat (limited to 'drivers/power/jz4740-battery.c')
-rw-r--r--drivers/power/jz4740-battery.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/power/jz4740-battery.c b/drivers/power/jz4740-battery.c
index a8108a73593e..2bbe04ae13a7 100644
--- a/drivers/power/jz4740-battery.c
+++ b/drivers/power/jz4740-battery.c
@@ -47,6 +47,8 @@ struct jz_battery {
struct power_supply battery;
struct delayed_work work;
+
+ struct mutex lock;
};
static inline struct jz_battery *psy_to_jz_battery(struct power_supply *psy)
@@ -68,6 +70,8 @@ static long jz_battery_read_voltage(struct jz_battery *battery)
unsigned long val;
long voltage;
+ mutex_lock(&battery->lock);
+
INIT_COMPLETION(battery->read_completion);
enable_irq(battery->irq);
@@ -91,6 +95,8 @@ static long jz_battery_read_voltage(struct jz_battery *battery)
battery->cell->disable(battery->pdev);
disable_irq(battery->irq);
+ mutex_unlock(&battery->lock);
+
return voltage;
}
@@ -291,6 +297,7 @@ static int __devinit jz_battery_probe(struct platform_device *pdev)
jz_battery->pdev = pdev;
init_completion(&jz_battery->read_completion);
+ mutex_init(&jz_battery->lock);
INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);