req->buf = data;
req->length = len;
+ /*
+ * UDC layer requires to provide a buffer even for ZLP, but should
+ * not use it at all. Let's provide some poisoned pointer to catch
+ * possible bug in the driver.
+ */
+ if (req->buf == NULL)
+ req->buf = (void *)0xDEADBABE;
+
INIT_COMPLETION(ffs->ep0req_completion);
ret = usb_ep_queue(ffs->gadget->ep0, req, GFP_ATOMIC);