USB: Fix NULL pointer bug when handle data toggle error interrupt.

diff --git a/drivers/usb/dwc_otg_310/dwc_otg_hcd_linux.c b/drivers/usb/dwc_otg_310/dwc_otg_hcd_linux.c
index c870426f7dca0a102e2325d3271b5174ff335cc2..6ab5719fb78c0a7292bad51c6463bdbcd261155d 100755 (executable)
--- a/drivers/usb/dwc_otg_310/dwc_otg_hcd_linux.c
+++ b/drivers/usb/dwc_otg_310/dwc_otg_hcd_linux.c
@@ -158,6 +158,9 @@ inline struct usb_host_endpoint *dwc_urb_to_endpoint(struct urb *urb)
        struct usb_device *dev = urb->dev;
        int ep_num = usb_pipeendpoint(urb->pipe);
 
+       if (!dev)
+               return NULL;
+
        if (usb_pipein(urb->pipe))
                return dev->ep_in[ep_num];
        else