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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 368C5C5B579 for ; Fri, 28 Jun 2019 12:39:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0F9352133F for ; Fri, 28 Jun 2019 12:39:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726833AbfF1MjT (ORCPT ); Fri, 28 Jun 2019 08:39:19 -0400 Received: from smtp1.de.adit-jv.com ([93.241.18.167]:36211 "EHLO smtp1.de.adit-jv.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726667AbfF1MjT (ORCPT ); Fri, 28 Jun 2019 08:39:19 -0400 Received: from localhost (smtp1.de.adit-jv.com [127.0.0.1]) by smtp1.de.adit-jv.com (Postfix) with ESMTP id 4BCD43C00C6; Fri, 28 Jun 2019 14:39:16 +0200 (CEST) Received: from smtp1.de.adit-jv.com ([127.0.0.1]) by localhost (smtp1.de.adit-jv.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LpuWT6knsDUd; Fri, 28 Jun 2019 14:39:10 +0200 (CEST) Received: from HI2EXCH01.adit-jv.com (hi2exch01.adit-jv.com [10.72.92.24]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by smtp1.de.adit-jv.com (Postfix) with ESMTPS id E4E303C00BB; Fri, 28 Jun 2019 14:39:10 +0200 (CEST) Received: from vmlxhi-102.adit-jv.com (10.72.93.184) by HI2EXCH01.adit-jv.com (10.72.92.24) with Microsoft SMTP Server (TLS) id 14.3.439.0; Fri, 28 Jun 2019 14:39:10 +0200 Date: Fri, 28 Jun 2019 14:39:07 +0200 From: Eugeniu Rosca To: Geert Uytterhoeven CC: Eugeniu Rosca , Eugeniu Rosca , Geert Uytterhoeven , Greg Kroah-Hartman , Jiri Slaby , Yoshihiro Shimoda , Vinod Koul , Dan Williams , Wolfram Sang , "open list:SERIAL DRIVERS" , Linux-Renesas , , "George G . Davis" Subject: Re: [PATCH 0/2] serial: sh-sci: Fix .flush_buffer() issues Message-ID: <20190628123907.GA10962@vmlxhi-102.adit-jv.com> References: <20190624123540.20629-1-geert+renesas@glider.be> <20190626173434.GA24702@x230> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) X-Originating-IP: [10.72.93.184] Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org Hi Geert, On Fri, Jun 28, 2019 at 01:51:25PM +0200, Geert Uytterhoeven wrote: [..] > If a serial port is used as a console, the port is used for both DMA > (normal use) and PIO (serial console output). The latter can have a > negative impact on the former, aggravating existing bugs, or triggering > more races, even in the hardware. So I think it's better to be more > cautious and keep DMA disabled for the console. Thanks for the extensive and comprehensible replies. No more questions from my end. Looking forward to picking the patches from vanilla/stable trees. -- Best Regards, Eugeniu.