diff options
| author | Lars-Peter Clausen <lars@metafoo.de> | 2010-11-11 19:00:52 +0100 |
|---|---|---|
| committer | Anton Vorontsov <cbouatmailru@gmail.com> | 2010-11-18 16:56:16 +0300 |
| commit | 8ec98fe0b4ffdedce4c1caa9fb3d550f52ad1c6b (patch) | |
| tree | af77279c42d3c1e9e21676b1d28ca8ec1c043c73 /drivers | |
| parent | 86af95039b69a90db15294eb1f9c147f1df0a8ea (diff) | |
jz4740-battery: Protect against concurrent battery readings
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/power/jz4740-battery.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/power/jz4740-battery.c b/drivers/power/jz4740-battery.c index a8108a73593..2bbe04ae13a 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); |