[PATCH 4.4 01/47] usb: gadget: inode.c: fix unbalanced spin_lock in ep0_write

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Eccher <d.eccher@xxxxxxxxx>

commit b7bd98b7db9fc8fe19da1a5ff0215311c6b95e46 upstream.

Fix bad unlock balance: ep0_write enter with the locks locked from
inode.c:1769, hence it must exit with spinlock held to avoid double
unlock in dev_config.

Signed-off-by: David Eccher <d.eccher@xxxxxxxxx>
Signed-off-by: Felipe Balbi <balbi@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/usb/gadget/legacy/inode.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/usb/gadget/legacy/inode.c
+++ b/drivers/usb/gadget/legacy/inode.c
@@ -1140,10 +1140,9 @@ ep0_write (struct file *fd, const char _
 						dev->gadget->ep0, dev->req,
 						GFP_KERNEL);
 				}
+				spin_lock_irq(&dev->lock);
 				if (retval < 0) {
-					spin_lock_irq (&dev->lock);
 					clean_req (dev->gadget->ep0, dev->req);
-					spin_unlock_irq (&dev->lock);
 				} else
 					retval = len;