49 lines
1.2 KiB
Diff
49 lines
1.2 KiB
Diff
--- a/drivers/power/jz4740-battery.c
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+++ b/drivers/power/jz4740-battery.c
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@@ -47,6 +47,8 @@ struct jz_battery {
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struct power_supply battery;
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struct delayed_work work;
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+
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+ struct mutex lock;
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};
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static inline struct jz_battery *psy_to_jz_battery(struct power_supply *psy)
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@@ -68,6 +70,8 @@ static long jz_battery_read_voltage(stru
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unsigned long val;
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long voltage;
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+ mutex_lock(&battery->lock);
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+
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INIT_COMPLETION(battery->read_completion);
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enable_irq(battery->irq);
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@@ -91,6 +95,8 @@ static long jz_battery_read_voltage(stru
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battery->cell->disable(battery->pdev);
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disable_irq(battery->irq);
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+ mutex_unlock(&battery->lock);
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+
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return voltage;
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}
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@@ -240,6 +246,11 @@ static int __devinit jz_battery_probe(st
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struct jz_battery *jz_battery;
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struct power_supply *battery;
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+ if (!pdata) {
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+ dev_err(&pdev->dev, "No platform_data supplied\n");
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+ return -ENXIO;
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+ }
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+
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jz_battery = kzalloc(sizeof(*jz_battery), GFP_KERNEL);
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if (!jz_battery) {
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dev_err(&pdev->dev, "Failed to allocate driver structure\n");
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@@ -291,6 +302,7 @@ static int __devinit jz_battery_probe(st
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jz_battery->pdev = pdev;
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init_completion(&jz_battery->read_completion);
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+ mutex_init(&jz_battery->lock);
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INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);
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