From patchwork Wed Apr 7 10:39:25 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 417959 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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, 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 C145FC43470 for ; Wed, 7 Apr 2021 10:40:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 72DD6613A0 for ; Wed, 7 Apr 2021 10:40:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351214AbhDGKka (ORCPT ); Wed, 7 Apr 2021 06:40:30 -0400 Received: from mail.kernel.org ([198.145.29.99]:49076 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1351171AbhDGKkB (ORCPT ); Wed, 7 Apr 2021 06:40:01 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 813DF613D1; Wed, 7 Apr 2021 10:39:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1617791991; bh=hxIJtit8EJ+Brug2ei0l8Ef85prFYKfb3oZE4LDPzpI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LVspfmEPa8er2cjfB+y3xA0dzojAAv5vX/qOnYHKDrAyjbk0RJ5V+u9XHOE9YvpgO 7sYSVssG4GRB9stoIZzsGPT8iEd4PyRPDH8r5iflrm+ibpLvskZrpDEaMsYxHYi+Bz kdxPG4C7NcPTHF9IojRxDUlkpFbhDMSCu1LK+r3EXVTcANA5Ju4b6QGzIgSeFdT/y9 +PwcyPo+s2RfJOFNHYZGMk4FrTRWZMbsRUTb9ftKFmoyfaCp2tSzWbrG+R0uXTZQXw 0W33FDbp4fbwKozrqQ+bnRoFQ3SqJisSI7fsoTDn6NDxo7lrYSOvJV/f6Za4yt49+K uPkjbgG9rLmUA== Received: from johan by xi.lan with local (Exim 4.93.0.4) (envelope-from ) id 1lU5b6-0000Fg-D7; Wed, 07 Apr 2021 12:39:44 +0200 From: Johan Hovold To: Johan Hovold Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 24/24] USB: serial: ftdi_sio: clean up TIOCSSERIAL Date: Wed, 7 Apr 2021 12:39:25 +0200 Message-Id: <20210407103925.829-25-johan@kernel.org> X-Mailer: git-send-email 2.26.3 In-Reply-To: <20210407103925.829-1-johan@kernel.org> References: <20210407103925.829-1-johan@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org The TIOCSSERIAL implementation needs to compare the old flag and divisor settings with the new to detect ASYNC_SPD changes, but there's no need to copy all driver state to the stack for that. While at it, unbreak the function parameter list. Signed-off-by: Johan Hovold --- drivers/usb/serial/ftdi_sio.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c index 9228e56a91c0..6f2659e59b2e 100644 --- a/drivers/usb/serial/ftdi_sio.c +++ b/drivers/usb/serial/ftdi_sio.c @@ -1486,15 +1486,13 @@ static void get_serial_info(struct tty_struct *tty, struct serial_struct *ss) ss->custom_divisor = priv->custom_divisor; } -static int set_serial_info(struct tty_struct *tty, - struct serial_struct *ss) +static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss) { struct usb_serial_port *port = tty->driver_data; struct ftdi_private *priv = usb_get_serial_port_data(port); - struct ftdi_private old_priv; + int old_flags, old_divisor; mutex_lock(&priv->cfg_lock); - old_priv = *priv; if (!capable(CAP_SYS_ADMIN)) { if ((ss->flags ^ priv->flags) & ~ASYNC_USR_MASK) { @@ -1503,14 +1501,17 @@ static int set_serial_info(struct tty_struct *tty, } } + old_flags = priv->flags; + old_divisor = priv->custom_divisor; + priv->flags = ss->flags & ASYNC_FLAGS; priv->custom_divisor = ss->custom_divisor; write_latency_timer(port); - if ((priv->flags ^ old_priv.flags) & ASYNC_SPD_MASK || + if ((priv->flags ^ old_flags) & ASYNC_SPD_MASK || ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST && - priv->custom_divisor != old_priv.custom_divisor)) { + priv->custom_divisor != old_divisor)) { /* warn about deprecation unless clearing */ if (priv->flags & ASYNC_SPD_MASK)