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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 Message-ID-Hash: MHUQ7CC22WTJ265VSDMHFVQ45QVVNTH5 X-Message-ID-Hash: MHUQ7CC22WTJ265VSDMHFVQ45QVVNTH5 X-MailFrom: vaibhav@linux.ibm.com X-Mailman-Rule-Hits: nonmember-moderation X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation CC: Vaibhav Jain , "Aneesh Kumar K . V" , Michael Ellerman , Steven Rostedt X-Mailman-Version: 3.1.1 Precedence: list List-Id: "Linux-nvdimm developer list." Archived-At: List-Archive: List-Help: List-Post: List-Subscribe: List-Unsubscribe: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit 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, -- 2.26.2 _______________________________________________ Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org To unsubscribe send an email to linux-nvdimm-leave@lists.01.org