usb: ldusb: ld_usb semaphore to mutex

Signed-off-by: Daniel Walker <[e-mail]>
Acked-by: Matthew Wilcox <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/misc/ldusb.c

···
 
 /* Structure to hold all of our device specific stuff */
 struct ld_usb {
-	struct semaphore	sem;		/* locks this structure */
+	struct mutex		mutex;		/* locks this structure */
 	struct usb_interface*	intf;		/* save off the usb interface pointer */
 
 	int			open_count;	/* number of times this port has been opened */
···
 		return -ENODEV;
 
 	/* lock this device */
-	if (down_interruptible(&dev->sem))
+	if (mutex_lock_interruptible(&dev->mutex))
 		return -ERESTARTSYS;
 
 	/* allow opening only once */
···
 	file->private_data = dev;
 
 unlock_exit:
-	up(&dev->sem);
+	mutex_unlock(&dev->mutex);
 
 	return retval;
 }
···
 		goto exit;
 	}
 
-	if (down_interruptible(&dev->sem)) {
+	if (mutex_lock_interruptible(&dev->mutex)) {
 		retval = -ERESTARTSYS;
 		goto exit;
 	}
···
 	}
 	if (dev->intf == NULL) {
 		/* the device was unplugged before the file was released */
-		up(&dev->sem);
+		mutex_unlock(&dev->mutex);
 		/* unlock here as ld_usb_delete frees dev */
 		ld_usb_delete(dev);
 		goto exit;
···
 	dev->open_count = 0;
 
 unlock_exit:
-	up(&dev->sem);
+	mutex_unlock(&dev->mutex);
 
 exit:
 	return retval;
···
 		goto exit;
 
 	/* lock this object */
-	if (down_interruptible(&dev->sem)) {
+	if (mutex_lock_interruptible(&dev->mutex)) {
 		retval = -ERESTARTSYS;
 		goto exit;
 	}
···
 
 unlock_exit:
 	/* unlock the device */
-	up(&dev->sem);
+	mutex_unlock(&dev->mutex);
 
 exit:
 	return retval;
···
 		goto exit;
 
 	/* lock this object */
-	if (down_interruptible(&dev->sem)) {
+	if (mutex_lock_interruptible(&dev->mutex)) {
 		retval = -ERESTARTSYS;
 		goto exit;
 	}
···
 
 unlock_exit:
 	/* unlock the device */
-	up(&dev->sem);
+	mutex_unlock(&dev->mutex);
 
 exit:
 	return retval;
···
 		dev_err(&intf->dev, "Out of memory\n");
 		goto exit;
 	}
-	init_MUTEX(&dev->sem);
+	mutex_init(&dev->mutex);
 	spin_lock_init(&dev->rbsl);
 	dev->intf = intf;
 	init_waitqueue_head(&dev->read_wait);
···
 	/* give back our minor */
 	usb_deregister_dev(intf, &ld_usb_class);
 
-	down(&dev->sem);
+	mutex_lock(&dev->mutex);
 
 	/* if the device is not opened, then we clean up right now */
 	if (!dev->open_count) {
-		up(&dev->sem);
+		mutex_unlock(&dev->mutex);
 		ld_usb_delete(dev);
 	} else {
 		dev->intf = NULL;
-		up(&dev->sem);
+		mutex_unlock(&dev->mutex);
 	}
 
 	dev_info(&intf->dev, "LD USB Device #%d now disconnected\n",