diff --git a/[refs] b/[refs]
index 965badffbd49..0e123b1a6f68 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 42077b0a3328792974b232691f5d0eb9dd644768
+refs/heads/master: 78c58a53c9864447f2a46d4c06dd3c2616823ad2
diff --git a/trunk/drivers/usb/dwc3/gadget.c b/trunk/drivers/usb/dwc3/gadget.c
index 0c934a195deb..1de4d3f87569 100644
--- a/trunk/drivers/usb/dwc3/gadget.c
+++ b/trunk/drivers/usb/dwc3/gadget.c
@@ -61,6 +61,11 @@ void dwc3_map_buffer_to_dma(struct dwc3_request *req)
 {
 	struct dwc3			*dwc = req->dep->dwc;
 
+	if (req->request.length == 0) {
+		/* req->request.dma = dwc->setup_buf_addr; */
+		return;
+	}
+
 	if (req->request.dma == DMA_ADDR_INVALID) {
 		req->request.dma = dma_map_single(dwc->dev, req->request.buf,
 				req->request.length, req->direction
@@ -78,6 +83,11 @@ void dwc3_unmap_buffer_from_dma(struct dwc3_request *req)
 {
 	struct dwc3			*dwc = req->dep->dwc;
 
+	if (req->request.length == 0) {
+		req->request.dma = DMA_ADDR_INVALID;
+		return;
+	}
+
 	if (req->mapped) {
 		dma_unmap_single(dwc->dev, req->request.dma,
 				req->request.length, req->direction