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=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,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 5976CC433DB for ; Wed, 24 Mar 2021 06:42:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 28DA76191A for ; Wed, 24 Mar 2021 06:42:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230269AbhCXGmS (ORCPT ); Wed, 24 Mar 2021 02:42:18 -0400 Received: from mga01.intel.com ([192.55.52.88]:23554 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230041AbhCXGmA (ORCPT ); Wed, 24 Mar 2021 02:42:00 -0400 IronPort-SDR: pJ+/e3xqpSnxDb6hFyxUlXA6GLknd1Ou73xJLqk6zOjvGcHR5uRTWqKdkI7H89Khdn9kY0wmTp L4EShT7Z3mzQ== X-IronPort-AV: E=McAfee;i="6000,8403,9932"; a="210739756" X-IronPort-AV: E=Sophos;i="5.81,274,1610438400"; d="scan'208";a="210739756" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Mar 2021 23:42:00 -0700 IronPort-SDR: NT4+/DdOkxENlHgafw08wJsSqZLkPMNVtiS/Ygvbz2H1aAze1hTodXHcbVXPrXYZhmCDBgl4d3 WIBkKVMSHv7g== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.81,274,1610438400"; d="scan'208";a="442079888" Received: from unknown (HELO [10.239.154.55]) ([10.239.154.55]) by fmsmga002.fm.intel.com with ESMTP; 23 Mar 2021 23:41:55 -0700 Subject: Re: [PATCH v10] i2c: virtio: add a virtio i2c frontend driver To: Viresh Kumar Cc: linux-i2c@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, mst@redhat.com, wsa@kernel.org, jasowang@redhat.com, wsa+renesas@sang-engineering.com, andriy.shevchenko@linux.intel.com, conghui.chen@intel.com, arnd@arndb.de, kblaiech@mellanox.com, jarkko.nikula@linux.intel.com, Sergey.Semin@baikalelectronics.ru, rppt@kernel.org, loic.poulain@linaro.org, tali.perry1@gmail.com, u.kleine-koenig@pengutronix.de, bjorn.andersson@linaro.org, yu1.wang@intel.com, shuo.a.liu@intel.com, stefanha@redhat.com, pbonzini@redhat.com References: <226a8d5663b7bb6f5d06ede7701eedb18d1bafa1.1616493817.git.jie.deng@intel.com> <20210324042046.idkctj2t7cxi53jf@vireshk-i7> <70908366-c270-848e-0be3-c85fec7958ec@intel.com> <20210324060907.nwilmghg2xcdz7nv@vireshk-i7> From: Jie Deng Message-ID: <84f0bf1b-9b69-6fc0-011c-2aafde208435@intel.com> Date: Wed, 24 Mar 2021 14:41:52 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Firefox/78.0 Thunderbird/78.7.0 MIME-Version: 1.0 In-Reply-To: <20210324060907.nwilmghg2xcdz7nv@vireshk-i7> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org On 2021/3/24 14:09, Viresh Kumar wrote: > On 24-03-21, 14:05, Jie Deng wrote: > Or, now that I think about it a bit more, another thing we can do here is see if > virtqueue_get_buf() returns NULL, if it does then we should keep expecting more > messages as it may be early interrupt. What do you say ? I don't think we really need this because for this device, early interrupt is a bad operation which should be avoided. I can't think of why this device need to send early interrupt, what we can do is to clarify that this means loss of the remaining requests. A device should never do this, if it does then loss is the expected result.