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>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 3ac170f9d94d..3d2c53e4ac92 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2487,7 +2487,11 @@ static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc)
          * implemented.
          */
 
-        dwc->gadget_driver->resume(&dwc->gadget);
+        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,