From: Alan Stern <stern@rowland.harvard.edu>
Date: Fri, 11 Oct 2013 15:28:44 +0000 (-0400)
Subject: USB: EHCI: change toggle only upon successful reset
X-Git-Tag: v3.13-rc1~174^2~72
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=27c4a31d6739095d613c6e72fb44867bc28c699f;p=platform%2Fkernel%2Flinux-stable.git

USB: EHCI: change toggle only upon successful reset

ehci-hcd uses a value of 0 in an endpoint's toggle flag to indicate
that the endpoint has been reset (and therefore the Data Toggle bit
needs to be cleared in the endpoint's QH overlay region).

The toggle flag should be set to 0 only when ehci_endpoint_reset()
succeeds.  This patch moves the usb_settoggle() call into the
appropriate branch of the "if" statement.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 3e3ca83..652018f 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1022,7 +1022,6 @@ ehci_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
 	 * the toggle bit in the QH.
 	 */
 	if (qh) {
-		usb_settoggle(qh->dev, epnum, is_out, 0);
 		if (!list_empty(&qh->qtd_list)) {
 			WARN_ONCE(1, "clear_halt for a busy endpoint\n");
 		} else {
@@ -1030,6 +1029,7 @@ ehci_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
 			 * while the QH is active.  Unlink it now;
 			 * re-linking will call qh_refresh().
 			 */
+			usb_settoggle(qh->dev, epnum, is_out, 0);
 			qh->exception = 1;
 			if (eptype == USB_ENDPOINT_XFER_BULK)
 				start_unlink_async(ehci, qh);