linux-kernel - [PATCH 4.19 81/84] usb: dwc3: gadget: Fix request complete check

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Date:   Sat, 11 Jan 2020 10:50:58 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Thinh Nguyen <thinhn@...opsys.com>
Subject: [PATCH 4.19 81/84] usb: dwc3: gadget: Fix request complete check

From: Thinh Nguyen <Thinh.Nguyen@...opsys.com>

commit ea0d762775e20aaff7909a3f0866ff1688b1c618 upstream.

We can only check for IN direction if the request had completed. For OUT
direction, it's perfectly fine that the host can send less than the
setup length. Let's return true fall all cases of OUT direction.

Fixes: e0c42ce590fe ("usb: dwc3: gadget: simplify IOC handling")
Cc: stable@...r.kernel.org
Signed-off-by: Thinh Nguyen <thinhn@...opsys.com>
Link: https://lore.kernel.org/r/ac5a3593a94fdaa3d92e6352356b5f7a01ccdc7c.1576291140.git.thinhn@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/dwc3/gadget.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2271,6 +2271,13 @@ static int dwc3_gadget_ep_reclaim_trb_li
 
 static bool dwc3_gadget_ep_request_completed(struct dwc3_request *req)
 {
+	/*
+	 * For OUT direction, host may send less than the setup
+	 * length. Return true for all OUT requests.
+	 */
+	if (!req->direction)
+		return true;
+
 	return req->request.actual == req->request.length;
 }