diff --git a/drivers/staging/tm6000/tm6000-cards.c b/drivers/staging/tm6000/tm6000-cards.c
index bac4309a386835a9c3a5cf16d6deaffc29903630..f247e7e685f92c13d2bd873b38d9774678ca2d03 100644
--- a/drivers/staging/tm6000/tm6000-cards.c
+++ b/drivers/staging/tm6000/tm6000-cards.c
@@ -1168,6 +1168,7 @@ static int tm6000_usb_probe(struct usb_interface *interface,
 		return -ENOMEM;
 	}
 	spin_lock_init(&dev->slock);
+	mutex_init(&dev->usb_lock);
 
 	/* Increment usage count */
 	tm6000_devused |= 1<<nr;
diff --git a/drivers/staging/tm6000/tm6000-core.c b/drivers/staging/tm6000/tm6000-core.c
index f85e5f2cf75d58e6c9bb9ee52aed7338ff67a2b6..31fdf15477e13221763e7c4ecbdd66d25657b91a 100644
--- a/drivers/staging/tm6000/tm6000-core.c
+++ b/drivers/staging/tm6000/tm6000-core.c
@@ -39,6 +39,8 @@ int tm6000_read_write_usb(struct tm6000_core *dev, u8 req_type, u8 req,
 	unsigned int pipe;
 	u8	     *data = NULL;
 
+	mutex_lock(&dev->usb_lock);
+
 	if (len)
 		data = kzalloc(len, GFP_KERNEL);
 
@@ -86,9 +88,9 @@ int tm6000_read_write_usb(struct tm6000_core *dev, u8 req_type, u8 req,
 	}
 
 	kfree(data);
-
 	msleep(5);
 
+	mutex_unlock(&dev->usb_lock);
 	return ret;
 }
 
diff --git a/drivers/staging/tm6000/tm6000.h b/drivers/staging/tm6000/tm6000.h
index 4323fc2c1487dd0382eca313d02820bafd52d9f4..cf57e1e3aa62145c6102bf7a03e158d83563bf84 100644
--- a/drivers/staging/tm6000/tm6000.h
+++ b/drivers/staging/tm6000/tm6000.h
@@ -245,6 +245,7 @@ struct tm6000_core {
 
 	/* locks */
 	struct mutex			lock;
+	struct mutex			usb_lock;
 
 	/* usb transfer */
 	struct usb_device		*udev;		/* the usb device */