From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from out4-smtp.messagingengine.com ([66.111.4.28]:59603 "EHLO out4-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752147AbcKGQui (ORCPT ); Mon, 7 Nov 2016 11:50:38 -0500 Subject: FAILED: patch "[PATCH] USB: serial: cp210x: fix tiocmget error handling" failed to apply to 4.4-stable tree To: johan@kernel.org, stable@vger.kernel.org Cc: From: Date: Mon, 07 Nov 2016 17:50:46 +0100 Message-ID: <147853744699138@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: The patch below does not apply to the 4.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >>From de24e0a108bc48062e1c7acaa97014bce32a919f Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Wed, 19 Oct 2016 15:45:07 +0200 Subject: [PATCH] USB: serial: cp210x: fix tiocmget error handling The current tiocmget implementation would fail to report errors up the stack and instead leaked a few bits from the stack as a mask of modem-status flags. Fixes: 39a66b8d22a3 ("[PATCH] USB: CP2101 Add support for flow control") Cc: stable Signed-off-by: Johan Hovold diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c index 54a4de0efdba..f61477bed3a8 100644 --- a/drivers/usb/serial/cp210x.c +++ b/drivers/usb/serial/cp210x.c @@ -1077,7 +1077,9 @@ static int cp210x_tiocmget(struct tty_struct *tty) u8 control; int result; - cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); + result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); + if (result) + return result; result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) |((control & CONTROL_RTS) ? TIOCM_RTS : 0)