Linux-NVDIMM Archive on lore.kernel.org
 help / color / Atom feed
* [PATCH V2] bnvdimm/namsepace: Don't set claim_class on error
@ 2019-09-25 18:48 ira.weiny
  2019-09-25 19:36 ` Dan Williams
  0 siblings, 1 reply; 3+ messages in thread
From: ira.weiny @ 2019-09-25 18:48 UTC (permalink / raw)
  To: Dan Williams, Vishal Verma; +Cc: kernel-janitors, linux-nvdimm

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

^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, back to index

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
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 21:15   ` Ira Weiny

Linux-NVDIMM Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-nvdimm/0 linux-nvdimm/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-nvdimm linux-nvdimm/ https://lore.kernel.org/linux-nvdimm \
		linux-nvdimm@lists.01.org
	public-inbox-index linux-nvdimm

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.01.lists.linux-nvdimm


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git