From patchwork Fri Jun 18 06:14:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiri Slaby X-Patchwork-Id: 464141 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, 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 5D948C48BE8 for ; Fri, 18 Jun 2021 06:16:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 465E460FE6 for ; Fri, 18 Jun 2021 06:16:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232841AbhFRGSw (ORCPT ); Fri, 18 Jun 2021 02:18:52 -0400 Received: from smtp-out2.suse.de ([195.135.220.29]:46730 "EHLO smtp-out2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233118AbhFRGRz (ORCPT ); Fri, 18 Jun 2021 02:17:55 -0400 Received: from relay2.suse.de (relay2.suse.de [149.44.160.134]) by smtp-out2.suse.de (Postfix) with ESMTP id 7986E1FE00; Fri, 18 Jun 2021 06:15:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1623996925; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=rfkwiMcfVfUg3JuOVlfnbb/dw2b1Z6NVGhmaE+vMfEk=; b=bx3pi6UpkFLccnGnEPE1VSut3DpBwEr6IIvNLmzyKO6bJJxjyzP+QptnG0KlHne5ebQyJ5 O0+d182PP9JptG9dVeYwj90CGNDwFjG9UjtyLM847q0NY5NVwDSE7uDXJOIke1qeAj72M4 WIr/C6bLXG/rJeHIKLKdXHfu4gsCIhw= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1623996925; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=rfkwiMcfVfUg3JuOVlfnbb/dw2b1Z6NVGhmaE+vMfEk=; b=oTDMWreCzPtjO+kO3POvfCaV8qqntyPr0LiObDv84hPMUG9gzSxJtwMeRZF4n0l+DWp6Do GHNx86tGTJnz1DDQ== Received: from localhost.localdomain (unknown [10.100.208.98]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by relay2.suse.de (Postfix) with ESMTPS id 5181EA3B99; Fri, 18 Jun 2021 06:15:25 +0000 (UTC) From: Jiri Slaby To: gregkh@linuxfoundation.org Cc: linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, Jiri Slaby Subject: [PATCH 39/70] mxser: simplify mxser_ioctl_op_mode Date: Fri, 18 Jun 2021 08:14:45 +0200 Message-Id: <20210618061516.662-40-jslaby@suse.cz> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210618061516.662-1-jslaby@suse.cz> References: <20210618061516.662-1-jslaby@suse.cz> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org * ModeMask local array is just inverted OP_MODE_MASK shifted by shiftbit. Drop this array and use the value directly. * return from the if's true branch and drop 'else' branch by moving the code completely outside the if. Signed-off-by: Jiri Slaby --- drivers/tty/mxser.c | 27 ++++++++++----------------- 1 file changed, 10 insertions(+), 17 deletions(-) diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c index 4a584db09494..e082ae055c39 100644 --- a/drivers/tty/mxser.c +++ b/drivers/tty/mxser.c @@ -1411,10 +1411,9 @@ static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg, static int mxser_ioctl_op_mode(struct mxser_port *port, int index, bool set, int __user *u_opmode) { - static const unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f }; int opmode, p = index % 4; int shiftbit = p * 2; - unsigned char val, mask; + u8 val; if (port->board->must_hwid != MOXA_MUST_MU860_HWID) return -EFAULT; @@ -1423,30 +1422,24 @@ static int mxser_ioctl_op_mode(struct mxser_port *port, int index, bool set, if (get_user(opmode, u_opmode)) return -EFAULT; - if (opmode != RS232_MODE && opmode != RS485_2WIRE_MODE && - opmode != RS422_MODE && - opmode != RS485_4WIRE_MODE) - return -EFAULT; - - mask = ModeMask[p]; + if (opmode & ~OP_MODE_MASK) + return -EINVAL; spin_lock_irq(&port->slock); val = inb(port->opmode_ioaddr); - val &= mask; + val &= ~(OP_MODE_MASK << shiftbit); val |= (opmode << shiftbit); outb(val, port->opmode_ioaddr); spin_unlock_irq(&port->slock); - } else { - spin_lock_irq(&port->slock); - opmode = inb(port->opmode_ioaddr) >> shiftbit; - spin_unlock_irq(&port->slock); - opmode &= OP_MODE_MASK; - if (put_user(opmode, u_opmode)) - return -EFAULT; + return 0; } - return 0; + spin_lock_irq(&port->slock); + opmode = inb(port->opmode_ioaddr) >> shiftbit; + spin_unlock_irq(&port->slock); + + return put_user(opmode & OP_MODE_MASK, u_opmode); } static int mxser_ioctl(struct tty_struct *tty,