hwmon: (s3c-hwmon) Use a real mutex

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>

diff --git a/drivers/hwmon/s3c-hwmon.c b/drivers/hwmon/s3c-hwmon.c
index 3f3f9a4..05248f2 100644 (file)
--- a/drivers/hwmon/s3c-hwmon.c
+++ b/drivers/hwmon/s3c-hwmon.c
@@ -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. */