Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030207AbcJFJDO (ORCPT ); Thu, 6 Oct 2016 05:03:14 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:49395 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S966686AbcJFJDL (ORCPT ); Thu, 6 Oct 2016 05:03:11 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Konstantin Shkolnyy , Johan Hovold Subject: [PATCH 4.4 85/93] USB: serial: cp210x: fix hardware flow-control disable Date: Thu, 6 Oct 2016 10:29:55 +0200 Message-Id: <20161006074735.511904540@linuxfoundation.org> X-Mailer: git-send-email 2.10.0 In-Reply-To: <20161006074731.150212126@linuxfoundation.org> References: <20161006074731.150212126@linuxfoundation.org> User-Agent: quilt/0.64 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 Content-Length: 1413 Lines: 51 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Konstantin Shkolnyy commit a377f9e906af4df9071ba8ddba60188cb4013d93 upstream. A bug in the CRTSCTS handling caused RTS to alternate between CRTSCTS=0 => "RTS is transmit active signal" and CRTSCTS=1 => "RTS is used for receive flow control" instead of CRTSCTS=0 => "RTS is statically active" and CRTSCTS=1 => "RTS is used for receive flow control" This only happened after first having enabled CRTSCTS. Signed-off-by: Konstantin Shkolnyy Fixes: 39a66b8d22a3 ("[PATCH] USB: CP2101 Add support for flow control") [johan: reword commit message ] Signed-off-by: Johan Hovold [johan: backport to 4.4 ] Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- This is a backport of an upstream fix to v4.4, which should apply too earlier stable trees as well. Johan drivers/usb/serial/cp210x.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/usb/serial/cp210x.c +++ b/drivers/usb/serial/cp210x.c @@ -784,7 +784,7 @@ static void cp210x_set_termios(struct tt } else { modem_ctl[0] &= ~0x7B; modem_ctl[0] |= 0x01; - modem_ctl[1] |= 0x40; + modem_ctl[1] = 0x40; dev_dbg(dev, "%s - flow control = NONE\n", __func__); }