usb: dwc3: gadget: release spin lock during gadget resume

It's a requirement that we release controller's lock
while calling gadget API function pointers. This
patch just fixes that long standing bug.
Signed-off-by: Jiebing Li <jiebing.li@intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/dwc3/gadget.c

@@ -2487,7 +2487,11 @@ static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc)
 	 * implemented.
 	 */
 
+	if (dwc->gadget_driver && dwc->gadget_driver->resume) {
+		spin_unlock(&dwc->lock);
 		dwc->gadget_driver->resume(&dwc->gadget);
+		spin_lock(&dwc->lock);
+	}
 }
 
 static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,