diff --git a/[refs] b/[refs]
index 1152f8f553a6..a5e3cb1c19d5 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 46c9844c4014be53c67622dcd3ba4302f36e9cac
+refs/heads/master: a08b43aee46ed4272ad7bee2c785edcf313339b3
diff --git a/trunk/drivers/usb/misc/vstusb.c b/trunk/drivers/usb/misc/vstusb.c
index 63dff9ba73c5..f26ea8dc1577 100644
--- a/trunk/drivers/usb/misc/vstusb.c
+++ b/trunk/drivers/usb/misc/vstusb.c
@@ -401,6 +401,7 @@ static ssize_t vstusb_write(struct file *file, const char __user *buffer,
 	}
 
 	if (copy_from_user(buf, buffer, count)) {
+		mutex_unlock(&vstdev->lock);
 		dev_err(&dev->dev, "%s: can't copy_from_user\n", __func__);
 		retval = -EFAULT;
 		goto exit;