linux-kernel - [PATCH 4.10 56/81] xhci: Set URB actual length for stopped control transfers

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Date:   Thu,  6 Apr 2017 10:38:48 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Mathias Nyman <mathias.nyman@...ux.intel.com>
Subject: [PATCH 4.10 56/81] xhci: Set URB actual length for stopped control transfers

4.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mathias Nyman <mathias.nyman@...ux.intel.com>

commit 0ab2881a406b9fd46224a3e8253bbc0141b4f844 upstream.

A control transfer that stopped at the status stage incorrectly
warned about a "unexpected TRB Type 4", and did not set the
transferred actual_length for the URB.

The URB actual_length for control transfers should contain the
bytes transferred in the data stage.

Bytes of a partially sent setup stage and missing bytes from
status stage should be left out.

Signed-off-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/host/xhci-ring.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -2000,6 +2000,9 @@ static int process_ctrl_td(struct xhci_h
 		case TRB_NORMAL:
 			td->urb->actual_length = requested - remaining;
 			goto finish_td;
+		case TRB_STATUS:
+			td->urb->actual_length = requested;
+			goto finish_td;
 		default:
 			xhci_warn(xhci, "WARN: unexpected TRB Type %d\n",
 				  trb_type);