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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Thinh Nguyen <Thinh.Nguyen@synopsys.com>,
        Felipe Balbi <balbi@kernel.org>
Subject: [PATCH 5.9 242/391] usb: dwc3: gadget: Reclaim extra TRBs after request completion
Date:   Tue,  3 Nov 2020 21:34:53 +0100
Message-Id: <20201103203403.337060578@linuxfoundation.org>
In-Reply-To: <20201103203348.153465465@linuxfoundation.org>
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From: Thinh Nguyen <Thinh.Nguyen@synopsys.com>

commit 690e5c2dc29f8891fcfd30da67e0d5837c2c9df5 upstream.

An SG request may be partially completed (due to no available TRBs).
Don't reclaim extra TRBs and clear the needs_extra_trb flag until the
request is fully completed. Otherwise, the driver will reclaim the wrong
TRB.

Cc: stable@vger.kernel.org
Fixes: 1f512119a08c ("usb: dwc3: gadget: add remaining sg entries to ring")
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/dwc3/gadget.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2732,6 +2732,11 @@ static int dwc3_gadget_ep_cleanup_comple
 		ret = dwc3_gadget_ep_reclaim_trb_linear(dep, req, event,
 				status);
 
+	req->request.actual = req->request.length - req->remaining;
+
+	if (!dwc3_gadget_ep_request_completed(req))
+		goto out;
+
 	if (req->needs_extra_trb) {
 		unsigned int maxp = usb_endpoint_maxp(dep->endpoint.desc);
 
@@ -2747,11 +2752,6 @@ static int dwc3_gadget_ep_cleanup_comple
 		req->needs_extra_trb = false;
 	}
 
-	req->request.actual = req->request.length - req->remaining;
-
-	if (!dwc3_gadget_ep_request_completed(req))
-		goto out;
-
 	dwc3_gadget_giveback(dep, req, status);
 
 out: