From patchwork Thu Jun 4 23:41:34 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vaibhav Jain X-Patchwork-Id: 1303821 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 49dMyj1cSGz9sTD for ; Fri, 5 Jun 2020 09:52:29 +1000 (AEST) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.ibm.com Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 49dMyh2gN3zDqjd for ; Fri, 5 Jun 2020 09:52:28 +1000 (AEST) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=linux.ibm.com (client-ip=148.163.156.1; helo=mx0a-001b2d01.pphosted.com; envelope-from=vaibhav@linux.ibm.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.ibm.com Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 49dMlW5lk0zDqhC for ; Fri, 5 Jun 2020 09:42:47 +1000 (AEST) Received: from pps.filterd (m0098396.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 054NW3Po090119; Thu, 4 Jun 2020 19:42:14 -0400 Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 31f9dj228v-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 04 Jun 2020 19:42:14 -0400 Received: from m0098396.ppops.net (m0098396.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.36/8.16.0.36) with SMTP id 054Ne15X115127; Thu, 4 Jun 2020 19:42:14 -0400 Received: from ppma03ams.nl.ibm.com (62.31.33a9.ip4.static.sl-reverse.com [169.51.49.98]) by mx0a-001b2d01.pphosted.com with ESMTP id 31f9dj2287-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 04 Jun 2020 19:42:14 -0400 Received: from pps.filterd (ppma03ams.nl.ibm.com [127.0.0.1]) by ppma03ams.nl.ibm.com (8.16.0.42/8.16.0.42) with SMTP id 054Neg20028440; Thu, 4 Jun 2020 23:42:11 GMT Received: from b06avi18626390.portsmouth.uk.ibm.com (b06avi18626390.portsmouth.uk.ibm.com [9.149.26.192]) by ppma03ams.nl.ibm.com with ESMTP id 31bf482x7u-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 04 Jun 2020 23:42:11 +0000 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06avi18626390.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 054NerDv63045936 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 4 Jun 2020 23:40:53 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E1E83A4057; Thu, 4 Jun 2020 23:42:08 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6B6DAA404D; Thu, 4 Jun 2020 23:42:04 +0000 (GMT) Received: from vajain21-in-ibm-com (unknown [9.85.71.124]) by d06av23.portsmouth.uk.ibm.com (Postfix) with SMTP; Thu, 4 Jun 2020 23:42:04 +0000 (GMT) Received: by vajain21-in-ibm-com (sSMTP sendmail emulation); Fri, 05 Jun 2020 05:12:03 +0530 From: Vaibhav Jain To: linuxppc-dev@lists.ozlabs.org, linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org Subject: [PATCH v10 4/6] powerpc/papr_scm: Improve error logging and handling papr_scm_ndctl() Date: Fri, 5 Jun 2020 05:11:34 +0530 Message-Id: <20200604234136.253703-5-vaibhav@linux.ibm.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200604234136.253703-1-vaibhav@linux.ibm.com> References: <20200604234136.253703-1-vaibhav@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216, 18.0.687 definitions=2020-06-04_13:2020-06-04, 2020-06-04 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 mlxlogscore=999 impostorscore=0 adultscore=0 lowpriorityscore=0 suspectscore=0 priorityscore=1501 malwarescore=0 cotscore=-2147483648 mlxscore=0 spamscore=0 clxscore=1015 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006040160 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Santosh Sivaraj , Steven Rostedt , Oliver O'Halloran , "Aneesh Kumar K . V" , Vaibhav Jain , Dan Williams , Ira Weiny Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Since papr_scm_ndctl() can be called from outside papr_scm, its exposed to the possibility of receiving NULL as value of 'cmd_rc' argument. This patch updates papr_scm_ndctl() to protect against such possibility by assigning it pointer to a local variable in case cmd_rc == NULL. Finally the patch also updates the 'default' clause of the switch-case block removing a 'return' statement thereby ensuring that value of 'cmd_rc' is always logged when papr_scm_ndctl() returns. Cc: "Aneesh Kumar K . V" Cc: Dan Williams Cc: Michael Ellerman Cc: Ira Weiny Signed-off-by: Vaibhav Jain --- Changelog: v9..v10 * New patch in the series --- arch/powerpc/platforms/pseries/papr_scm.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c index 0c091622b15e..6512fe6a2874 100644 --- a/arch/powerpc/platforms/pseries/papr_scm.c +++ b/arch/powerpc/platforms/pseries/papr_scm.c @@ -355,11 +355,16 @@ static int papr_scm_ndctl(struct nvdimm_bus_descriptor *nd_desc, { struct nd_cmd_get_config_size *get_size_hdr; struct papr_scm_priv *p; + int rc; /* Only dimm-specific calls are supported atm */ if (!nvdimm) return -EINVAL; + /* Use a local variable in case cmd_rc pointer is NULL */ + if (!cmd_rc) + cmd_rc = &rc; + p = nvdimm_provider_data(nvdimm); switch (cmd) { @@ -381,12 +386,13 @@ static int papr_scm_ndctl(struct nvdimm_bus_descriptor *nd_desc, break; default: - return -EINVAL; + dev_dbg(&p->pdev->dev, "Unknown command = %d\n", cmd); + *cmd_rc = -EINVAL; } dev_dbg(&p->pdev->dev, "returned with cmd_rc = %d\n", *cmd_rc); - return 0; + return *cmd_rc; } static ssize_t flags_show(struct device *dev,