scx200_acb: Use mutex instead of semaphore

The scx200_acb driver use a semaphore as mutex.  Use the mutex API
instead of the (binary) semaphore.
Signed-off-by: NMatthias Kaehlcke <matthias.kaehlcke@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Cc: Jordan Crouse <jordan.crouse@amd.com>
Signed-off-by: NJean Delvare <khali@linux-fr.org>

drivers/i2c/busses/scx200_acb.c

@@ -388,7 +388,7 @@ static const struct i2c_algorithm scx200_acb_algorithm = {
 };
 
 static struct scx200_acb_iface *scx200_acb_list;
-static DECLARE_MUTEX(scx200_acb_list_mutex);
+static DEFINE_MUTEX(scx200_acb_list_mutex);
 
 static __init int scx200_acb_probe(struct scx200_acb_iface *iface)
 {
@@ -472,10 +472,10 @@ static int __init scx200_acb_create(struct scx200_acb_iface *iface)
 		return -ENODEV;
 	}
 
-	down(&scx200_acb_list_mutex);
+	mutex_lock(&scx200_acb_list_mutex);
 	iface->next = scx200_acb_list;
 	scx200_acb_list = iface;
-	up(&scx200_acb_list_mutex);
+	mutex_unlock(&scx200_acb_list_mutex);
 
 	return 0;
 }
@@ -633,10 +633,10 @@ static void __exit scx200_acb_cleanup(void)
 {
 	struct scx200_acb_iface *iface;
 
-	down(&scx200_acb_list_mutex);
+	mutex_lock(&scx200_acb_list_mutex);
 	while ((iface = scx200_acb_list) != NULL) {
 		scx200_acb_list = iface->next;
-		up(&scx200_acb_list_mutex);
+		mutex_unlock(&scx200_acb_list_mutex);
 
 		i2c_del_adapter(&iface->adapter);
 
@@ -648,9 +648,9 @@ static void __exit scx200_acb_cleanup(void)
 			release_region(iface->base, 8);
 
 		kfree(iface);
-		down(&scx200_acb_list_mutex);
+		mutex_lock(&scx200_acb_list_mutex);
 	}
-	up(&scx200_acb_list_mutex);
+	mutex_unlock(&scx200_acb_list_mutex);
 }
 
 module_init(scx200_acb_init);