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=-6.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,T_DKIMWL_WL_HIGH,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 E87EEC468BD for ; Fri, 7 Jun 2019 15:57:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B805920657 for ; Fri, 7 Jun 2019 15:57:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559923076; bh=op1gChslQGxNPa936LUqZEqpWuej5GsHZdQxDraDVkw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=n2ozhAMlFGHch/JiR6OqGWsPrnyw7QYMG975LaTSCutPf7TTVSD532b4O44/1xgxq 12qFv0m74ju5wEnRJ6sngbxoj4LB8M9GLQKnhZPJNiPDL6jPh6ifbUMueCYvwDZuH+ 5cM65tMOeTRNJD8Jc4j+qnNoH+vxUnvBUlT4UMyc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730859AbfFGPn1 (ORCPT ); Fri, 7 Jun 2019 11:43:27 -0400 Received: from mail.kernel.org ([198.145.29.99]:54606 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729770AbfFGPn1 (ORCPT ); Fri, 7 Jun 2019 11:43:27 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.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 B3DC12146E; Fri, 7 Jun 2019 15:43:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559922206; bh=op1gChslQGxNPa936LUqZEqpWuej5GsHZdQxDraDVkw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TRoFRKu6TYSDfOQUQCdW4yLfvlFufaKA4B8If+o8u8mrX1VOlGDM+XCyAFv0AEuSt FimCE7BR78l/vJDdIUmFwywaEIOobWC/0hQInQLoHMGoVKuvgrk08T7l69DGwAsQf9 eBXIsfMBaHI6Q5rbn1HXfcy7Yno7huh54nvgbSQI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jorge Ramirez-Ortiz , Bjorn Andersson , Stephen Boyd Subject: [PATCH 4.14 48/69] tty: serial: msm_serial: Fix XON/XOFF Date: Fri, 7 Jun 2019 17:39:29 +0200 Message-Id: <20190607153854.275715769@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190607153848.271562617@linuxfoundation.org> References: <20190607153848.271562617@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Jorge Ramirez-Ortiz commit 61c0e37950b88bad590056286c1d766b1f167f4e upstream. When the tty layer requests the uart to throttle, the current code executing in msm_serial will trigger "Bad mode in Error Handler" and generate an invalid stack frame in pstore before rebooting (that is if pstore is indeed configured: otherwise the user shall just notice a reboot with no further information dumped to the console). This patch replaces the PIO byte accessor with the word accessor already used in PIO mode. Fixes: 68252424a7c7 ("tty: serial: msm: Support big-endian CPUs") Cc: stable@vger.kernel.org Signed-off-by: Jorge Ramirez-Ortiz Reviewed-by: Bjorn Andersson Reviewed-by: Stephen Boyd Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/msm_serial.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/drivers/tty/serial/msm_serial.c +++ b/drivers/tty/serial/msm_serial.c @@ -868,6 +868,7 @@ static void msm_handle_tx(struct uart_po struct circ_buf *xmit = &msm_port->uart.state->xmit; struct msm_dma *dma = &msm_port->tx_dma; unsigned int pio_count, dma_count, dma_min; + char buf[4] = { 0 }; void __iomem *tf; int err = 0; @@ -877,10 +878,12 @@ static void msm_handle_tx(struct uart_po else tf = port->membase + UART_TF; + buf[0] = port->x_char; + if (msm_port->is_uartdm) msm_reset_dm_count(port, 1); - iowrite8_rep(tf, &port->x_char, 1); + iowrite32_rep(tf, buf, 1); port->icount.tx++; port->x_char = 0; return;