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=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 B9977C2D0A3 for ; Mon, 9 Nov 2020 13:10:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 739292076E for ; Mon, 9 Nov 2020 13:10:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604927438; bh=plTQ463f7O7C7m/PyWDfj2uNECJMq4D8a4ONT6HSCr0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=xXQX08k8uvSdg5cFHvvWtifylzuAjxbYMpzfNrshkiC5LBE6/88s5iCF4nMeq6/Ut O7nyxP+YAcOuPw1fy2r7no7Jx32dJ+gsE8q76ultX61giOnhalfKB8wA8LoEUH1BaF C4oFLzWrYGrCQFSYulua4WRKIcqsX6I1ckx/yWU0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732130AbgKINKh (ORCPT ); Mon, 9 Nov 2020 08:10:37 -0500 Received: from mail.kernel.org ([198.145.29.99]:35858 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732096AbgKINKd (ORCPT ); Mon, 9 Nov 2020 08:10:33 -0500 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (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 2603420663; Mon, 9 Nov 2020 13:10:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604927432; bh=plTQ463f7O7C7m/PyWDfj2uNECJMq4D8a4ONT6HSCr0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1zNMfr3kOjH+Ya35zi/YLncwPB7v3HqFgE93weD4ulHBHfIblXv9YQO2G/LQZ3dW1 Hs000DFic3sdUkAQNbrXBnSgw32T3qTzMFdfFGhjAJdEaoUIcdX+XIqntKzgEnjBf5 0pKX7mjrubx7AUyMjPS0B+Lo+yyLSJyZ1wqZzjXg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Claire Chang Subject: [PATCH 4.19 57/71] serial: 8250_mtk: Fix uart_get_baud_rate warning Date: Mon, 9 Nov 2020 13:55:51 +0100 Message-Id: <20201109125022.585161681@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201109125019.906191744@linuxfoundation.org> References: <20201109125019.906191744@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Claire Chang commit 912ab37c798770f21b182d656937072b58553378 upstream. Mediatek 8250 port supports speed higher than uartclk / 16. If the baud rates in both the new and the old termios setting are higher than uartclk / 16, the WARN_ON in uart_get_baud_rate() will be triggered. Passing NULL as the old termios so uart_get_baud_rate() will use uartclk / 16 - 1 as the new baud rate which will be replaced by the original baud rate later by tty_termios_encode_baud_rate() in mtk8250_set_termios(). Fixes: 551e553f0d4a ("serial: 8250_mtk: Fix high-speed baud rates clamping") Signed-off-by: Claire Chang Link: https://lore.kernel.org/r/20201102120749.374458-1-tientzu@chromium.org Cc: stable Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_mtk.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/tty/serial/8250/8250_mtk.c +++ b/drivers/tty/serial/8250/8250_mtk.c @@ -47,7 +47,7 @@ mtk8250_set_termios(struct uart_port *po */ baud = tty_termios_baud_rate(termios); - serial8250_do_set_termios(port, termios, old); + serial8250_do_set_termios(port, termios, NULL); tty_termios_encode_baud_rate(termios, baud, baud);