Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751780AbaLOOt3 (ORCPT ); Mon, 15 Dec 2014 09:49:29 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:38671 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752068AbaLOO2Y (ORCPT ); Mon, 15 Dec 2014 09:28:24 -0500 From: Luis Henriques To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Mathias Nyman , Greg Kroah-Hartman , Luis Henriques Subject: [PATCH 3.16.y-ckt 094/168] USB: xhci: don't start a halted endpoint before its new dequeue is set Date: Mon, 15 Dec 2014 14:25:48 +0000 Message-Id: <1418653622-21105-95-git-send-email-luis.henriques@canonical.com> X-Mailer: git-send-email 2.1.3 In-Reply-To: <1418653622-21105-1-git-send-email-luis.henriques@canonical.com> References: <1418653622-21105-1-git-send-email-luis.henriques@canonical.com> X-Extended-Stable: 3.16 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.16.7-ckt3 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Mathias Nyman commit c3492dbfa1050debf23a5b5cd2bc7514c5b37896 upstream. A halted endpoint ring must first be reset, then move the ring dequeue pointer past the problematic TRB. If we start the ring too early after reset, but before moving the dequeue pointer we will end up executing the same problematic TRB again. As we always issue a set transfer dequeue command after a reset endpoint command we can skip starting endpoint rings at reset endpoint command completion. Without this fix we end up trying to handle the same faulty TD for contol endpoints. causing timeout, and failing testusb ctrl_out write tests. Fixes: e9df17e (USB: xhci: Correct assumptions about number of rings per endpoint.) Tested-by: Felipe Balbi Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman Signed-off-by: Luis Henriques --- drivers/usb/host/xhci-ring.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 28a929d45cfe..5188a6bded0e 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -1102,9 +1102,8 @@ static void xhci_handle_cmd_reset_ep(struct xhci_hcd *xhci, int slot_id, false); xhci_ring_cmd_db(xhci); } else { - /* Clear our internal halted state and restart the ring(s) */ + /* Clear our internal halted state */ xhci->devs[slot_id]->eps[ep_index].ep_state &= ~EP_HALTED; - ring_doorbell_for_active_rings(xhci, slot_id, ep_index); } } -- 2.1.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/