1 files changed, 6 insertions, 18 deletions

diff --git a/drivers/usb/misc/legousbtower.c b/drivers/usb/misc/legousbtower.c
index 1713e19..2ed0dae 100644
--- a/drivers/usb/misc/legousbtower.c
+++ b/drivers/usb/misc/legousbtower.c
@@ -254,9 +254,6 @@ static int  tower_probe	(struct usb_interface *interface, const struct usb_devic
 static void tower_disconnect	(struct usb_interface *interface);
 
 
-/* prevent races between open() and disconnect */
-static DEFINE_MUTEX (disconnect_mutex);
-
 /* file operations needed when we register this driver */
 static const struct file_operations tower_fops = {
 	.owner =	THIS_MODULE,
@@ -344,28 +341,26 @@ static int tower_open (struct inode *inode, struct file *file)
 	nonseekable_open(inode, file);
 	subminor = iminor(inode);
 
-	mutex_lock (&disconnect_mutex);
-
 	interface = usb_find_interface (&tower_driver, subminor);
 
 	if (!interface) {
 		err ("%s - error, can't find device for minor %d",
 		     __FUNCTION__, subminor);
 		retval = -ENODEV;
-		goto unlock_disconnect_exit;
+		goto exit;
 	}
 
 	dev = usb_get_intfdata(interface);
 
 	if (!dev) {
 		retval = -ENODEV;
-		goto unlock_disconnect_exit;
+		goto exit;
 	}
 
 	/* lock this device */
 	if (down_interruptible (&dev->sem)) {
 	        retval = -ERESTARTSYS;
-		goto unlock_disconnect_exit;
+		goto exit;
 	}
 
 	/* allow opening only once */
@@ -421,9 +416,7 @@ static int tower_open (struct inode *inode, struct file *file)
 unlock_exit:
 	up (&dev->sem);
 
-unlock_disconnect_exit:
-	mutex_unlock (&disconnect_mutex);
-
+exit:
 	dbg(2, "%s: leave, return value %d ", __FUNCTION__, retval);
 
 	return retval;
@@ -993,19 +986,16 @@ static void tower_disconnect (struct usb_interface *interface)
 
 	dbg(2, "%s: enter", __FUNCTION__);
 
-	mutex_lock (&disconnect_mutex);
-
 	dev = usb_get_intfdata (interface);
 	usb_set_intfdata (interface, NULL);
 
-
-	down (&dev->sem);
-
 	minor = dev->minor;
 
 	/* give back our minor */
 	usb_deregister_dev (interface, &tower_class);
 
+	down (&dev->sem);
+
 	/* if the device is not opened, then we clean up right now */
 	if (!dev->open_count) {
 		up (&dev->sem);
@@ -1015,8 +1005,6 @@ static void tower_disconnect (struct usb_interface *interface)
 		up (&dev->sem);
 	}
 
-	mutex_unlock (&disconnect_mutex);
-
 	info("LEGO USB Tower #%d now disconnected", (minor - LEGO_USB_TOWER_MINOR_BASE));
 
 	dbg(2, "%s: leave", __FUNCTION__);