[U-Boot] [PATCH] dwc3: flush cache only if there is a buffer attached to a request

[Marek Szyprowski]

Calling cache flush on invalid buffer, even with zero length might cause
an exception on certain platforms.

Signed-off-by: Marek Szyprowski <m.szyprowski at samsung.com>
---
 drivers/usb/dwc3/gadget.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 085f7b8968..67d11b4c0d 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -242,7 +242,8 @@ void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
 
 	list_del(&req->list);
 	req->trb = NULL;
-	dwc3_flush_cache((uintptr_t)req->request.dma, req->request.length);
+	if (req->request.length)
+		dwc3_flush_cache((uintptr_t)req->request.dma, req->request.length);
 
 	if (req->request.status == -EINPROGRESS)
 		req->request.status = status;
-- 
2.17.1