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=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 79C34C2D0A3 for ; Mon, 9 Nov 2020 13:35:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2F2B4206ED for ; Mon, 9 Nov 2020 13:35:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604928958; bh=0LisRcsaOQwUHAi14yXqT89DRf0dyrFbssm8tp7AO6g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=jrpjJBWNyciDBmKY7faflT5j7OvKs4Z8FyDmmyDHSizylQOI3F6EDFBrDJleTpCql dnwvnK9NYvdE/4qpNNbpa/eIT9ESlByhbmGcRa+X/19UGxmqwsvS/dCyPR1aN8JdRq /Kq8MWKMMus0V3vjbBVGGQHil+oXLRtokAS3wEY8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733106AbgKINf4 (ORCPT ); Mon, 9 Nov 2020 08:35:56 -0500 Received: from mail.kernel.org ([198.145.29.99]:58020 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730777AbgKINFU (ORCPT ); Mon, 9 Nov 2020 08:05:20 -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 0223720663; Mon, 9 Nov 2020 13:05:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604927102; bh=0LisRcsaOQwUHAi14yXqT89DRf0dyrFbssm8tp7AO6g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RFs1HaietzSJYzE3ZTarkR6qKAJl5TfJOVNvGgXI9e/4NjhJb6Y7R1oNOPmoWI3p5 2QDY7d3QFOpNgg6mAtTfRa9fz+3Iyw8wY2kDAoCFV3LpbCLsqlpvmZIxRHfmJKZ7Yw 4ttfYR8DoCYxQB3sw5vqedFx7Y3L2MOj7W32M8wI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Claire Chang Subject: [PATCH 4.9 110/117] serial: 8250_mtk: Fix uart_get_baud_rate warning Date: Mon, 9 Nov 2020 13:55:36 +0100 Message-Id: <20201109125030.920095810@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201109125025.630721781@linuxfoundation.org> References: <20201109125025.630721781@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 @@ -56,7 +56,7 @@ 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);