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jz4740-battery: Protect against concurrent battery readings

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We can not handle more then one ADC request at a time to the battery.
The patch adds a mutex around the ADC read code to ensure this.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: stable@kernel.org
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
This commit is contained in:
Lars-Peter Clausen 2010-11-11 19:00:52 +01:00 committed by Anton Vorontsov
parent 86af95039b
commit 8ec98fe0b4
1 changed files with 7 additions and 0 deletions
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7
drivers/power/jz4740-battery.c
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@ -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);