From 6856d30c6c0038dc0648009853533af3af6c5ba8 Mon Sep 17 00:00:00 2001
From: Felipe Balbi <balbi@ti.com>
Date: Tue, 30 Sep 2014 11:43:20 -0500
Subject: usb: dwc3: ep0: return early on NULL requests

if our list of requests is empty, return early.

There's really nothing to be done in case our
request list is empty anyway because the only
situation where we our list is empty, is when
we're transferring ZLPs.

Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
index ae6b575..a47cc1e 100644
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -789,9 +789,6 @@ static void dwc3_ep0_complete_data(struct dwc3 *dwc,
 
 	dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS;
 
-	r = next_request(&ep0->request_list);
-	ur = &r->request;
-
 	trb = dwc->ep0_trb;
 
 	status = DWC3_TRB_SIZE_TRBSTS(trb->size);
@@ -804,6 +801,12 @@ static void dwc3_ep0_complete_data(struct dwc3 *dwc,
 		return;
 	}
 
+	r = next_request(&ep0->request_list);
+	if (!r)
+		return;
+
+	ur = &r->request;
+
 	length = trb->size & DWC3_TRB_SIZE_MASK;
 
 	if (dwc->ep0_bounced) {
-- 
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