usb: gadget: pch_udc: Fix disconnect issue

commit c50a3bff0edb0acd49d8033a12ea4668e09a31ad upstream.

ISSUE:
When the driver notifies a gadget of a disconnect event, a system
rarely freezes.

CAUSE:
When the driver calls dev->driver->disconnect(), it is not calling
spin_unlock().

Signed-off-by: Tomoya MORINAGA <tomoya.rohm@gmail.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/usb/gadget/pch_udc.c b/drivers/usb/gadget/pch_udc.c
index 68dbcc3e4cc..2b731f3efab 100644
--- a/drivers/usb/gadget/pch_udc.c
+++ b/drivers/usb/gadget/pch_udc.c
@@ -2338,8 +2338,11 @@ static void pch_udc_svc_ur_interrupt(struct pch_udc_dev *dev)
                 /* Complete request queue */
                 empty_req_queue(ep);
         }
-        if (dev->driver && dev->driver->disconnect)
+        if (dev->driver && dev->driver->disconnect) {
+                spin_unlock(&dev->lock);
                 dev->driver->disconnect(&dev->gadget);
+                spin_lock(&dev->lock);
+        }
 }
 
 /**