From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 30587C5CFFE for ; Tue, 11 Dec 2018 15:56:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EAD4621104 for ; Tue, 11 Dec 2018 15:56:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1544543784; bh=c3O5bgeXW4UWAGgkrSWkrYOLSYce7kl7f15DjdEz0NY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=A2J/8tNMPuH7EvqNKYIhK3CG9txuyc6m5oPsFO4qQunmJXK7geTQcpckvvDeYHcro 0+cEOSvuhzPpk9EkVk4XeeD/ypCM/tmfjx1UkGbVYkA3gWPlFe4eQVWGtXiINPR0KN ka+i1xKeo1tscDK0t22H/Xu3UUIDum9ec9AYpqkU= DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EAD4621104 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730156AbeLKP4V (ORCPT ); Tue, 11 Dec 2018 10:56:21 -0500 Received: from mail.kernel.org ([198.145.29.99]:45062 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730549AbeLKP4R (ORCPT ); Tue, 11 Dec 2018 10:56:17 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 6931C21104; Tue, 11 Dec 2018 15:56:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1544543775; bh=c3O5bgeXW4UWAGgkrSWkrYOLSYce7kl7f15DjdEz0NY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=F/AYI3fYMfFLwY261MBdiaHQd52m7oyF0eMNxIo4YO/c2/ta90le+l/RkRytWEzFm 9Zxe98bNakEgZ9mApct9eqQsCyulkwl+Mi4kKMit9Z92R2dPFyNyJOJT+nHkgCuI3p xai/ou54o2LqwZ0HFe3CgNIrH5PN5WRfyL0730/Y= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Florian Zumbiehl , Jarkko Nikula , Johan Hovold Subject: [PATCH 4.19 059/118] USB: serial: console: fix reported terminal settings Date: Tue, 11 Dec 2018 16:41:18 +0100 Message-Id: <20181211151646.622202718@linuxfoundation.org> X-Mailer: git-send-email 2.20.0 In-Reply-To: <20181211151644.216668863@linuxfoundation.org> References: <20181211151644.216668863@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Johan Hovold commit f51ccf46217c28758b1f3b5bc0ccfc00eca658b2 upstream. The USB-serial console implementation has never reported the actual terminal settings used. Despite storing the corresponding cflags in its struct console, these were never honoured on later tty open() where the tty termios would be left initialised to the driver defaults. Unlike the serial console implementation, the USB-serial code calls subdriver open() already at console setup. While calling set_termios() and write() before open() looks like it could work for some USB-serial drivers, others definitely do not expect this, so modelling this after serial core is going to be intrusive, if at all possible. Instead, use a (renamed) tty helper to save the termios data used at console setup so that the tty termios reflects the actual terminal settings after a subsequent tty open(). Note that the calls to tty_init_termios() (tty_driver_install()) and tty_save_termios() are serialised using the disconnect mutex. This specifically fixes a regression that was triggered by a recent change adding software flow control to the pl2303 driver: a getty trying to disable flow control while leaving the baud rate unchanged would now also set the baud rate to the driver default (prior to the flow-control change this had been a noop). Fixes: 7041d9c3f01b ("USB: serial: pl2303: add support for tx xon/xoff flow control") Cc: stable # 4.18 Cc: Florian Zumbiehl Reported-by: Jarkko Nikula Tested-by: Jarkko Nikula Acked-by: Greg Kroah-Hartman Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- drivers/tty/tty_io.c | 11 +++++++++-- drivers/usb/serial/console.c | 2 +- include/linux/tty.h | 1 + 3 files changed, 11 insertions(+), 3 deletions(-) --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -1372,7 +1372,13 @@ err_release_lock: return ERR_PTR(retval); } -static void tty_free_termios(struct tty_struct *tty) +/** + * tty_save_termios() - save tty termios data in driver table + * @tty: tty whose termios data to save + * + * Locking: Caller guarantees serialisation with tty_init_termios(). + */ +void tty_save_termios(struct tty_struct *tty) { struct ktermios *tp; int idx = tty->index; @@ -1391,6 +1397,7 @@ static void tty_free_termios(struct tty_ } *tp = tty->termios; } +EXPORT_SYMBOL_GPL(tty_save_termios); /** * tty_flush_works - flush all works of a tty/pty pair @@ -1490,7 +1497,7 @@ static void release_tty(struct tty_struc WARN_ON(!mutex_is_locked(&tty_mutex)); if (tty->ops->shutdown) tty->ops->shutdown(tty); - tty_free_termios(tty); + tty_save_termios(tty); tty_driver_remove_tty(tty->driver, tty); tty->port->itty = NULL; if (tty->link) --- a/drivers/usb/serial/console.c +++ b/drivers/usb/serial/console.c @@ -101,7 +101,6 @@ static int usb_console_setup(struct cons cflag |= PARENB; break; } - co->cflag = cflag; /* * no need to check the index here: if the index is wrong, console @@ -164,6 +163,7 @@ static int usb_console_setup(struct cons serial->type->set_termios(tty, port, &dummy); tty_port_tty_set(&port->port, NULL); + tty_save_termios(tty); tty_kref_put(tty); } tty_port_set_initialized(&port->port, 1); --- a/include/linux/tty.h +++ b/include/linux/tty.h @@ -556,6 +556,7 @@ extern struct tty_struct *tty_init_dev(s extern void tty_release_struct(struct tty_struct *tty, int idx); extern int tty_release(struct inode *inode, struct file *filp); extern void tty_init_termios(struct tty_struct *tty); +extern void tty_save_termios(struct tty_struct *tty); extern int tty_standard_install(struct tty_driver *driver, struct tty_struct *tty);