From patchwork Wed Sep 12 14:10:09 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paolo Bonzini X-Patchwork-Id: 10597625 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A713713BF for ; Wed, 12 Sep 2018 14:11:02 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 966862A114 for ; Wed, 12 Sep 2018 14:11:02 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 93E4F2A1A1; Wed, 12 Sep 2018 14:11:02 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.3 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI,URIBL_SBL autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 198D92A197 for ; Wed, 12 Sep 2018 14:11:01 +0000 (UTC) Received: from localhost ([::1]:36461 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1g05r9-0004Ey-Mi for patchwork-qemu-devel@patchwork.kernel.org; Wed, 12 Sep 2018 10:10:59 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54579) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1g05qV-0003w4-Qm for qemu-devel@nongnu.org; Wed, 12 Sep 2018 10:10:24 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1g05qP-0000Ob-OL for qemu-devel@nongnu.org; Wed, 12 Sep 2018 10:10:18 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:41232 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1g05qP-0000NF-G7 for qemu-devel@nongnu.org; Wed, 12 Sep 2018 10:10:13 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 0BB4F40216E5; Wed, 12 Sep 2018 14:10:12 +0000 (UTC) Received: from donizetti.redhat.com (unknown [10.36.118.61]) by smtp.corp.redhat.com (Postfix) with ESMTP id D547FFA995; Wed, 12 Sep 2018 14:10:10 +0000 (UTC) From: Paolo Bonzini To: qemu-devel@nongnu.org Date: Wed, 12 Sep 2018 16:10:09 +0200 Message-Id: <20180912141009.19477-1-pbonzini@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.5]); Wed, 12 Sep 2018 14:10:12 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.5]); Wed, 12 Sep 2018 14:10:12 +0000 (UTC) for IP:'10.11.54.5' DOMAIN:'int-mx05.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'pbonzini@redhat.com' RCPT:'' X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 66.187.233.73 Subject: [Qemu-devel] [PATCH] serial: fix DLL writes X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux@roeck-us.net Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Commit 0147883450fe84bb8de2d4a58381881f4262ce9b tries to handle word-sized writes to DLL/DLH, but due to a typo, this patch is causing tracebacks in all Linux kernels running the PXA serial driver, due to an unexpected DLL register value. Here is the surrounding code from drivers/tty/serial/pxa.c: serial_out(up, UART_DLL, quot & 0xff); /* LS of divisor */ /* * work around Errata #75 according to Intel(R) PXA27x * Processor Family Specification Update (Nov 2005) */ dll = serial_in(up, UART_DLL); WARN_ON(dll != (quot & 0xff)); // <-- warning Reported-by: Guenter Roeck Tested-by: Guenter Roeck Fixes: 0147883450fe84bb8de2d4a58381881f4262ce9b Signed-off-by: Paolo Bonzini --- hw/char/serial.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/hw/char/serial.c b/hw/char/serial.c index 251f40fdac..02463e3388 100644 --- a/hw/char/serial.c +++ b/hw/char/serial.c @@ -345,9 +345,9 @@ static void serial_ioport_write(void *opaque, hwaddr addr, uint64_t val, default: case 0: if (s->lcr & UART_LCR_DLAB) { - if (size == 2) { + if (size == 1) { s->divider = (s->divider & 0xff00) | val; - } else if (size == 4) { + } else { s->divider = val; } serial_update_parameters(s);