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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 679FBC433EF for ; Mon, 13 Jun 2022 13:12:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1359277AbiFMNMy (ORCPT ); Mon, 13 Jun 2022 09:12:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38602 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1359455AbiFMNJ4 (ORCPT ); Mon, 13 Jun 2022 09:09:56 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DE6B03983B; Mon, 13 Jun 2022 04:20:42 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 3B804B80EAB; Mon, 13 Jun 2022 11:20:41 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 89310C34114; Mon, 13 Jun 2022 11:20:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1655119239; bh=i29J13wvF2mQ3XdIzvlfmTFJ+j3j+hpaGB3EjGM9yns=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Z690WoJKDZIv6r2QZ0tgeui/KvGgQxTTDtFt/Izq9bXosekfhg5IEDkGqf7Rv8QLA JqU9mjAag3v9icJtIf9BtD9QDXArfNZL1GL9UTGJ49R9V8ucgyyN5SwSvr6R8fohnv OVGE76embBximzklvRQRW3e1KKrTu6okdO4UfAdY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Marek Szyprowski , Petr Mladek , John Ogness , Sasha Levin Subject: [PATCH 5.15 190/247] serial: msm_serial: disable interrupts in __msm_console_write() Date: Mon, 13 Jun 2022 12:11:32 +0200 Message-Id: <20220613094928.714360109@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220613094922.843438024@linuxfoundation.org> References: <20220613094922.843438024@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: stable@vger.kernel.org From: John Ogness [ Upstream commit aabdbb1b7a5819e18c403334a31fb0cc2c06ad41 ] __msm_console_write() assumes that interrupts are disabled, but with threaded console printers it is possible that the write() callback of the console is called with interrupts enabled. Explicitly disable interrupts using local_irq_save() to preserve the assumed context. Reported-by: Marek Szyprowski Reviewed-by: Petr Mladek Signed-off-by: John Ogness Link: https://lore.kernel.org/r/20220506213324.470461-1-john.ogness@linutronix.de Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/tty/serial/msm_serial.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c index 489d19274f9a..03ff63438e77 100644 --- a/drivers/tty/serial/msm_serial.c +++ b/drivers/tty/serial/msm_serial.c @@ -1588,6 +1588,7 @@ static inline struct uart_port *msm_get_port_from_line(unsigned int line) static void __msm_console_write(struct uart_port *port, const char *s, unsigned int count, bool is_uartdm) { + unsigned long flags; int i; int num_newlines = 0; bool replaced = false; @@ -1605,6 +1606,8 @@ static void __msm_console_write(struct uart_port *port, const char *s, num_newlines++; count += num_newlines; + local_irq_save(flags); + if (port->sysrq) locked = 0; else if (oops_in_progress) @@ -1650,6 +1653,8 @@ static void __msm_console_write(struct uart_port *port, const char *s, if (locked) spin_unlock(&port->lock); + + local_irq_restore(flags); } static void msm_console_write(struct console *co, const char *s, -- 2.35.1