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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 18EE8C433EF for ; Thu, 11 Nov 2021 16:14:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 01BDC6124C for ; Thu, 11 Nov 2021 16:14:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234240AbhKKQQv (ORCPT ); Thu, 11 Nov 2021 11:16:51 -0500 Received: from mga11.intel.com ([192.55.52.93]:5694 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234183AbhKKQQt (ORCPT ); Thu, 11 Nov 2021 11:16:49 -0500 X-IronPort-AV: E=McAfee;i="6200,9189,10165"; a="230400557" X-IronPort-AV: E=Sophos;i="5.87,226,1631602800"; d="scan'208";a="230400557" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Nov 2021 08:13:59 -0800 X-IronPort-AV: E=Sophos;i="5.87,226,1631602800"; d="scan'208";a="670289533" Received: from smile.fi.intel.com ([10.237.72.184]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Nov 2021 08:13:53 -0800 Received: from andy by smile.fi.intel.com with local (Exim 4.95) (envelope-from ) id 1mlChq-005nc2-Vg; Thu, 11 Nov 2021 18:13:42 +0200 Date: Thu, 11 Nov 2021 18:13:42 +0200 From: Andy Shevchenko To: huangbibo Cc: linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, jarkko.nikula@linux.intel.com, mika.westerberg@linux.intel.com, p.zabel@pengutronix.de Subject: Re: [PATCH] i2c: designware: I2C unexpected interrupt handling will cause kernel panic Message-ID: References: <20211111065759.7423-1-huangbibo@uniontech.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20211111065759.7423-1-huangbibo@uniontech.com> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Nov 11, 2021 at 02:57:59PM +0800, huangbibo wrote: > I2C interrupts may be triggered unexpectedly, > such as programs that directly access I2C registers, Wow! What programs you are talking about? How comes they are doing this weirdness in parallel with the OS running? Can you elaborate, please? > bus conflicts caused by hardware design defects, etc. > These can cause null pointer reference errors and kernel panic. -- With Best Regards, Andy Shevchenko