target/linux/xburst/patches-2.6.37/300-battery-fixes.patch

   1 --- a/drivers/power/jz4740-battery.c
   2 +++ b/drivers/power/jz4740-battery.c
   3 @@ -47,6 +47,8 @@ struct jz_battery {
   4
   5         struct power_supply battery;
   6         struct delayed_work work;
   7 +
   8 +       struct mutex lock;
   9  };
  10
  11  static inline struct jz_battery *psy_to_jz_battery(struct power_supply *psy)
  12 @@ -68,6 +70,8 @@ static long jz_battery_read_voltage(stru
  13         unsigned long val;
  14         long voltage;
  15
  16 +       mutex_lock(&battery->lock);
  17 +
  18         INIT_COMPLETION(battery->read_completion);
  19
  20         enable_irq(battery->irq);
  21 @@ -91,6 +95,8 @@ static long jz_battery_read_voltage(stru
  22         battery->cell->disable(battery->pdev);
  23         disable_irq(battery->irq);
  24
  25 +       mutex_unlock(&battery->lock);
  26 +
  27         return voltage;
  28  }
  29
  30 @@ -240,6 +246,11 @@ static int __devinit jz_battery_probe(st
  31         struct jz_battery *jz_battery;
  32         struct power_supply *battery;
  33
  34 +       if (!pdata) {
  35 +               dev_err(&pdev->dev, "No platform_data supplied\n");
  36 +               return -ENXIO;
  37 +       }
  38 +
  39         jz_battery = kzalloc(sizeof(*jz_battery), GFP_KERNEL);
  40         if (!jz_battery) {
  41                 dev_err(&pdev->dev, "Failed to allocate driver structure\n");
  42 @@ -291,6 +302,7 @@ static int __devinit jz_battery_probe(st
  43         jz_battery->pdev = pdev;
  44
  45         init_completion(&jz_battery->read_completion);
  46 +       mutex_init(&jz_battery->lock);
  47
  48         INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);
  49