From: Felipe Balbi <felipe.balbi@linux.intel.com>
Date: Mon, 30 May 2016 10:42:33 +0000 (+0300)
Subject: UPSTREAM: usb: dwc3: gadget: decrement trbs_left for each sg entry
X-Git-Tag: firefly_0821_release~1783
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0d92fc598c00df40d94a3cd24730e9b633a6e745;p=firefly-linux-kernel-4.4.55.git

UPSTREAM: usb: dwc3: gadget: decrement trbs_left for each sg entry

If we don't, we will overwrite valid TRBs.

Change-Id: I8076fa857b9ae016617d58836de3d9dcf5be9e4c
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Wu Liang feng <wulf@rock-chips.com>
(cherry picked from commit d6dc2e76a860d6be0129daae43e5f12461531d20)
---

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 178cf6581cfe..5a4d7d855639 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -924,7 +924,7 @@ static void dwc3_prepare_one_trb_sg(struct dwc3_ep *dep,
 			chain = false;
 		}
 
-		if (!trbs_left)
+		if (!trbs_left--)
 			last = true;
 
 		if (last)