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hwmon: (s3c-hwmon) Use a real mutex

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The semaphore which protects the ADC is semantically a mutex. Use a
real mutex.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Thomas Gleixner 2010-10-28 20:31:44 +02:00 committed by Jean Delvare
parent caaa0f36c3
commit 9c627e3be3
1 changed files with 4 additions and 4 deletions
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8
drivers/hwmon/s3c-hwmon.c
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@ -51,7 +51,7 @@ struct s3c_hwmon_attr {
* @attr: The holders for the channel attributes.
*/
struct s3c_hwmon {
struct semaphore lock;
struct mutex lock;
struct s3c_adc_client *client;
struct device *hwmon_dev;
@ -73,14 +73,14 @@ static int s3c_hwmon_read_ch(struct device *dev,
{
int ret;
ret = down_interruptible(&hwmon->lock);
ret = mutex_lock_interruptible(&hwmon->lock);
if (ret < 0)
return ret;
dev_dbg(dev, "reading channel %d\n", channel);
ret = s3c_adc_read(hwmon->client, channel);
up(&hwmon->lock);
mutex_unlock(&hwmon->lock);
return ret;
}
@ -296,7 +296,7 @@ static int __devinit s3c_hwmon_probe(struct platform_device *dev)
platform_set_drvdata(dev, hwmon);
init_MUTEX(&hwmon->lock);
mutex_init(&hwmon->lock);
/* Register with the core ADC driver. */