All of lore.kernel.org
 help / color / mirror / Atom feed
From: ira.weiny@intel.com
To: Dan Williams <dan.j.williams@intel.com>,
	Vishal Verma <vishal.l.verma@intel.com>
Cc: kernel-janitors@vger.kernel.org, linux-nvdimm@lists.01.org
Subject: [PATCH V2] bnvdimm/namsepace: Don't set claim_class on error
Date: Wed, 25 Sep 2019 11:48:52 -0700	[thread overview]
Message-ID: <20190925184852.11707-1-ira.weiny@intel.com> (raw)

From: Ira Weiny <ira.weiny@intel.com>

Don't leave claim_class set to an invalid value if an error occurs in
btt_claim_class().

While we are here change the return type of __holder_class_store() to be
clear about the values it is returning.

This was found via code inspection.

Reviewed-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>

---
V1->V2
	Add space after variable declaration...

 drivers/nvdimm/namespace_devs.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 5b22cecefc99..eef885c59f47 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -1510,16 +1510,20 @@ static ssize_t holder_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(holder);
 
-static ssize_t __holder_class_store(struct device *dev, const char *buf)
+static int __holder_class_store(struct device *dev, const char *buf)
 {
 	struct nd_namespace_common *ndns = to_ndns(dev);
 
 	if (dev->driver || ndns->claim)
 		return -EBUSY;
 
-	if (sysfs_streq(buf, "btt"))
-		ndns->claim_class = btt_claim_class(dev);
-	else if (sysfs_streq(buf, "pfn"))
+	if (sysfs_streq(buf, "btt")) {
+		int rc = btt_claim_class(dev);
+
+		if (rc < NVDIMM_CCLASS_NONE)
+			return rc;
+		ndns->claim_class = rc;
+	} else if (sysfs_streq(buf, "pfn"))
 		ndns->claim_class = NVDIMM_CCLASS_PFN;
 	else if (sysfs_streq(buf, "dax"))
 		ndns->claim_class = NVDIMM_CCLASS_DAX;
@@ -1528,10 +1532,6 @@ static ssize_t __holder_class_store(struct device *dev, const char *buf)
 	else
 		return -EINVAL;
 
-	/* btt_claim_class() could've returned an error */
-	if ((int)ndns->claim_class < 0)
-		return ndns->claim_class;
-
 	return 0;
 }
 
@@ -1539,7 +1539,7 @@ static ssize_t holder_class_store(struct device *dev,
 		struct device_attribute *attr, const char *buf, size_t len)
 {
 	struct nd_region *nd_region = to_nd_region(dev->parent);
-	ssize_t rc;
+	int rc;
 
 	nd_device_lock(dev);
 	nvdimm_bus_lock(dev);
@@ -1547,7 +1547,7 @@ static ssize_t holder_class_store(struct device *dev,
 	rc = __holder_class_store(dev, buf);
 	if (rc >= 0)
 		rc = nd_namespace_label_update(nd_region, dev);
-	dev_dbg(dev, "%s(%zd)\n", rc < 0 ? "fail " : "", rc);
+	dev_dbg(dev, "%s(%d)\n", rc < 0 ? "fail " : "", rc);
 	nvdimm_bus_unlock(dev);
 	nd_device_unlock(dev);
 
-- 
2.20.1

_______________________________________________
Linux-nvdimm mailing list
Linux-nvdimm@lists.01.org
https://lists.01.org/mailman/listinfo/linux-nvdimm

WARNING: multiple messages have this Message-ID (diff)
From: ira.weiny@intel.com
To: Dan Williams <dan.j.williams@intel.com>,
	Vishal Verma <vishal.l.verma@intel.com>
Cc: kernel-janitors@vger.kernel.org, linux-nvdimm@lists.01.org
Subject: [PATCH V2] bnvdimm/namsepace: Don't set claim_class on error
Date: Wed, 25 Sep 2019 18:48:52 +0000	[thread overview]
Message-ID: <20190925184852.11707-1-ira.weiny@intel.com> (raw)

From: Ira Weiny <ira.weiny@intel.com>

Don't leave claim_class set to an invalid value if an error occurs in
btt_claim_class().

While we are here change the return type of __holder_class_store() to be
clear about the values it is returning.

This was found via code inspection.

Reviewed-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>

---
V1->V2
	Add space after variable declaration...

 drivers/nvdimm/namespace_devs.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 5b22cecefc99..eef885c59f47 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -1510,16 +1510,20 @@ static ssize_t holder_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(holder);
 
-static ssize_t __holder_class_store(struct device *dev, const char *buf)
+static int __holder_class_store(struct device *dev, const char *buf)
 {
 	struct nd_namespace_common *ndns = to_ndns(dev);
 
 	if (dev->driver || ndns->claim)
 		return -EBUSY;
 
-	if (sysfs_streq(buf, "btt"))
-		ndns->claim_class = btt_claim_class(dev);
-	else if (sysfs_streq(buf, "pfn"))
+	if (sysfs_streq(buf, "btt")) {
+		int rc = btt_claim_class(dev);
+
+		if (rc < NVDIMM_CCLASS_NONE)
+			return rc;
+		ndns->claim_class = rc;
+	} else if (sysfs_streq(buf, "pfn"))
 		ndns->claim_class = NVDIMM_CCLASS_PFN;
 	else if (sysfs_streq(buf, "dax"))
 		ndns->claim_class = NVDIMM_CCLASS_DAX;
@@ -1528,10 +1532,6 @@ static ssize_t __holder_class_store(struct device *dev, const char *buf)
 	else
 		return -EINVAL;
 
-	/* btt_claim_class() could've returned an error */
-	if ((int)ndns->claim_class < 0)
-		return ndns->claim_class;
-
 	return 0;
 }
 
@@ -1539,7 +1539,7 @@ static ssize_t holder_class_store(struct device *dev,
 		struct device_attribute *attr, const char *buf, size_t len)
 {
 	struct nd_region *nd_region = to_nd_region(dev->parent);
-	ssize_t rc;
+	int rc;
 
 	nd_device_lock(dev);
 	nvdimm_bus_lock(dev);
@@ -1547,7 +1547,7 @@ static ssize_t holder_class_store(struct device *dev,
 	rc = __holder_class_store(dev, buf);
 	if (rc >= 0)
 		rc = nd_namespace_label_update(nd_region, dev);
-	dev_dbg(dev, "%s(%zd)\n", rc < 0 ? "fail " : "", rc);
+	dev_dbg(dev, "%s(%d)\n", rc < 0 ? "fail " : "", rc);
 	nvdimm_bus_unlock(dev);
 	nd_device_unlock(dev);
 
-- 
2.20.1

             reply	other threads:[~2019-09-25 18:49 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-25 18:48 ira.weiny [this message]
2019-09-25 18:48 ` [PATCH V2] bnvdimm/namsepace: Don't set claim_class on error ira.weiny
2019-09-25 19:36 ` Dan Williams
2019-09-25 19:36   ` Dan Williams
2019-09-25 21:15   ` Ira Weiny
2019-09-25 21:15     ` Ira Weiny

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190925184852.11707-1-ira.weiny@intel.com \
    --to=ira.weiny@intel.com \
    --cc=dan.j.williams@intel.com \
    --cc=kernel-janitors@vger.kernel.org \
    --cc=linux-nvdimm@lists.01.org \
    --cc=vishal.l.verma@intel.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.