From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753189AbdHEAPc (ORCPT ); Fri, 4 Aug 2017 20:15:32 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:46354 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752792AbdHDXRP (ORCPT ); Fri, 4 Aug 2017 19:17:15 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, OGAWA Hirofumi , Samuel Ortiz , Amit Pundir Subject: [PATCH 4.9 026/105] nfc: Fix hangup of RC-S380* in port100_send_ack() Date: Fri, 4 Aug 2017 16:14:54 -0700 Message-Id: <20170804231553.497871532@linuxfoundation.org> X-Mailer: git-send-email 2.13.4 In-Reply-To: <20170804231551.544678194@linuxfoundation.org> References: <20170804231551.544678194@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: OGAWA Hirofumi commit 2497128133f8169b24b928852ba6eae34fc495e5 upstream. If port100_send_ack() was called twice or more, it has race to hangup. port100_send_ack() port100_send_ack() init_completion() [...] dev->cmd_cancel = true /* this removes previous from completion */ init_completion() [...] dev->cmd_cancel = true wait_for_completion() /* never be waked up */ wait_for_completion() Like above race, this code is not assuming port100_send_ack() is called twice or more. To fix, this checks dev->cmd_cancel to know if prior cancel is in-flight or not. And never be remove prior task from completion by using reinit_completion(), so this guarantees to be waked up properly soon or later. Signed-off-by: OGAWA Hirofumi Signed-off-by: Samuel Ortiz Signed-off-by: Amit Pundir Signed-off-by: Greg Kroah-Hartman --- drivers/nfc/port100.c | 37 ++++++++++++++++++++++++------------- 1 file changed, 24 insertions(+), 13 deletions(-) --- a/drivers/nfc/port100.c +++ b/drivers/nfc/port100.c @@ -725,23 +725,33 @@ static int port100_submit_urb_for_ack(st static int port100_send_ack(struct port100 *dev) { - int rc; + int rc = 0; mutex_lock(&dev->out_urb_lock); - init_completion(&dev->cmd_cancel_done); - - usb_kill_urb(dev->out_urb); + /* + * If prior cancel is in-flight (dev->cmd_cancel == true), we + * can skip to send cancel. Then this will wait the prior + * cancel, or merged into the next cancel rarely if next + * cancel was started before waiting done. In any case, this + * will be waked up soon or later. + */ + if (!dev->cmd_cancel) { + reinit_completion(&dev->cmd_cancel_done); - dev->out_urb->transfer_buffer = ack_frame; - dev->out_urb->transfer_buffer_length = sizeof(ack_frame); - rc = usb_submit_urb(dev->out_urb, GFP_KERNEL); + usb_kill_urb(dev->out_urb); - /* Set the cmd_cancel flag only if the URB has been successfully - * submitted. It will be reset by the out URB completion callback - * port100_send_complete(). - */ - dev->cmd_cancel = !rc; + dev->out_urb->transfer_buffer = ack_frame; + dev->out_urb->transfer_buffer_length = sizeof(ack_frame); + rc = usb_submit_urb(dev->out_urb, GFP_KERNEL); + + /* + * Set the cmd_cancel flag only if the URB has been + * successfully submitted. It will be reset by the out + * URB completion callback port100_send_complete(). + */ + dev->cmd_cancel = !rc; + } mutex_unlock(&dev->out_urb_lock); @@ -928,8 +938,8 @@ static void port100_send_complete(struct struct port100 *dev = urb->context; if (dev->cmd_cancel) { + complete_all(&dev->cmd_cancel_done); dev->cmd_cancel = false; - complete(&dev->cmd_cancel_done); } switch (urb->status) { @@ -1543,6 +1553,7 @@ static int port100_probe(struct usb_inte PORT100_COMM_RF_HEAD_MAX_LEN; dev->skb_tailroom = PORT100_FRAME_TAIL_LEN; + init_completion(&dev->cmd_cancel_done); INIT_WORK(&dev->cmd_complete_work, port100_wq_cmd_complete); /* The first thing to do with the Port-100 is to set the command type