1 files changed, 20 insertions, 27 deletions

diff --git a/drivers/usb/misc/iowarrior.c b/drivers/usb/misc/iowarrior.c
index 3bb33f7bfa36..46d9f27ec173 100644
--- a/drivers/usb/misc/iowarrior.c
+++ b/drivers/usb/misc/iowarrior.c
@@ -100,8 +100,6 @@ struct iowarrior {
 /*--------------*/
 /*    globals   */
 /*--------------*/
-/* prevent races between open() and disconnect() */
-static DECLARE_MUTEX(disconnect_sem);
 
 /*
  *  USB spec identifies 5 second timeouts.
@@ -160,9 +158,10 @@ static void iowarrior_callback(struct urb *urb)
 	int read_idx;
 	int aux_idx;
 	int offset;
-	int status;
+	int status = urb->status;
+	int retval;
 
-	switch (urb->status) {
+	switch (status) {
 	case 0:
 		/* success */
 		break;
@@ -215,10 +214,10 @@ static void iowarrior_callback(struct urb *urb)
 	wake_up_interruptible(&dev->read_wait);
 
 exit:
-	status = usb_submit_urb(urb, GFP_ATOMIC);
-	if (status)
+	retval = usb_submit_urb(urb, GFP_ATOMIC);
+	if (retval)
 		dev_err(&dev->interface->dev, "%s - usb_submit_urb failed with result %d",
-			__FUNCTION__, status);
+			__FUNCTION__, retval);
 
 }
 
@@ -228,13 +227,15 @@ exit:
 static void iowarrior_write_callback(struct urb *urb)
 {
 	struct iowarrior *dev;
+	int status = urb->status;
+
 	dev = (struct iowarrior *)urb->context;
 	/* sync/async unlink faults aren't errors */
-	if (urb->status &&
-	    !(urb->status == -ENOENT ||
-	      urb->status == -ECONNRESET || urb->status == -ESHUTDOWN)) {
+	if (status &&
+	    !(status == -ENOENT ||
+	      status == -ECONNRESET || status == -ESHUTDOWN)) {
 		dbg("%s - nonzero write bulk status received: %d",
-		    __func__, urb->status);
+		    __func__, status);
 	}
 	/* free up our allocated buffer */
 	usb_buffer_free(urb->dev, urb->transfer_buffer_length,
@@ -600,22 +601,18 @@ static int iowarrior_open(struct inode *inode, struct file *file)
 
 	subminor = iminor(inode);
 
-	/* prevent disconnects */
-	down(&disconnect_sem);
-
 	interface = usb_find_interface(&iowarrior_driver, subminor);
 	if (!interface) {
 		err("%s - error, can't find device for minor %d", __FUNCTION__,
 		    subminor);
-		retval = -ENODEV;
-		goto out;
+		return -ENODEV;
 	}
 
 	dev = usb_get_intfdata(interface);
-	if (!dev) {
-		retval = -ENODEV;
-		goto out;
-	}
+	if (!dev)
+		return -ENODEV;
+
+	mutex_lock(&dev->mutex);
 
 	/* Only one process can open each device, no sharing. */
 	if (dev->opened) {
@@ -636,7 +633,7 @@ static int iowarrior_open(struct inode *inode, struct file *file)
 	retval = 0;
 
 out:
-	up(&disconnect_sem);
+	mutex_unlock(&dev->mutex);
 	return retval;
 }
 
@@ -868,19 +865,16 @@ static void iowarrior_disconnect(struct usb_interface *interface)
 	struct iowarrior *dev;
 	int minor;
 
-	/* prevent races with open() */
-	down(&disconnect_sem);
-
 	dev = usb_get_intfdata(interface);
 	usb_set_intfdata(interface, NULL);
 
-	mutex_lock(&dev->mutex);
-
 	minor = dev->minor;
 
 	/* give back our minor */
 	usb_deregister_dev(interface, &iowarrior_class);
 
+	mutex_lock(&dev->mutex);
+
 	/* prevent device read, write and ioctl */
 	dev->present = 0;
 
@@ -898,7 +892,6 @@ static void iowarrior_disconnect(struct usb_interface *interface)
 		/* no process is using the device, cleanup now */
 		iowarrior_delete(dev);
 	}
-	up(&disconnect_sem);
 
 	dev_info(&interface->dev, "I/O-Warror #%d now disconnected\n",
 		 minor - IOWARRIOR_MINOR_BASE);