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=-6.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=ham 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 6CA3EC43613 for ; Thu, 20 Jun 2019 13:58:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 42C5D2070B for ; Thu, 20 Jun 2019 13:58:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726697AbfFTN6a (ORCPT ); Thu, 20 Jun 2019 09:58:30 -0400 Received: from foss.arm.com ([217.140.110.172]:39850 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726686AbfFTN6a (ORCPT ); Thu, 20 Jun 2019 09:58:30 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id AB885344; Thu, 20 Jun 2019 06:58:29 -0700 (PDT) Received: from [10.1.196.93] (en101.cambridge.arm.com [10.1.196.93]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 39AC53F718; Thu, 20 Jun 2019 06:58:28 -0700 (PDT) Subject: Re: [PATCH 2/2] coresight: Abort probe for missing CPU phandle To: saiprakash.ranjan@codeaurora.org, mathieu.poirier@linaro.org, leo.yan@linaro.org, alexander.shishkin@linux.intel.com, david.brown@linaro.org, mark.rutland@arm.com Cc: rnayak@codeaurora.org, vivek.gautam@codeaurora.org, sibis@codeaurora.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org References: From: Suzuki K Poulose Message-ID: <1ddee3c1-8299-1991-eb88-151b9c3ee180@arm.com> Date: Thu, 20 Jun 2019 14:58:27 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org On 20/06/2019 14:45, Sai Prakash Ranjan wrote: > Currently the coresight etm and cpu-debug drivers > assume the affinity to CPU0 returned by coresight > platform and continue the probe in case of missing > CPU phandle. This is not true and leads to crash > in some cases, so abort the probe in case of missing > CPU phandle. > > Signed-off-by: Sai Prakash Ranjan > --- > drivers/hwtracing/coresight/coresight-cpu-debug.c | 3 +++ > drivers/hwtracing/coresight/coresight-etm3x.c | 3 +++ > drivers/hwtracing/coresight/coresight-etm4x.c | 3 +++ > 3 files changed, 9 insertions(+) > > diff --git a/drivers/hwtracing/coresight/coresight-cpu-debug.c b/drivers/hwtracing/coresight/coresight-cpu-debug.c > index 07a1367c733f..43f32fa71ff9 100644 > --- a/drivers/hwtracing/coresight/coresight-cpu-debug.c > +++ b/drivers/hwtracing/coresight/coresight-cpu-debug.c > @@ -579,6 +579,9 @@ static int debug_probe(struct amba_device *adev, const struct amba_id *id) > return -ENOMEM; > > drvdata->cpu = coresight_get_cpu(dev); > + if (drvdata->cpu == -ENODEV) > + return -ENODEV; if (drvdata->cpu < 0) return drvdata->cpu; Same everywhere below ? Also, I would like to hear Mathieu's thoughts on this change. If he's OK with it: Reviewed-by: Suzuki K Poulose with the change above.