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
--- a/drivers/hwmon/s3c-hwmon.c
+++ b/drivers/hwmon/s3c-hwmon.c
@@ -51,7 +51,7 @@
* @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 @@
{
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 @@
platform_set_drvdata(dev, hwmon);
- init_MUTEX(&hwmon->lock);
+ mutex_init(&hwmon->lock);
/* Register with the core ADC driver. */