From: Bart Van Assche <bart.vanassche@sandisk.com>
Date: Fri, 10 Feb 2017 01:28:50 +0000 (-0800)
Subject: configfs: Introduce config_item_get_unless_zero()
X-Git-Tag: v4.12-rc6~23^2
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=19e72d3abb63cb16d021a4066ce1a18880509e99;p=thirdparty%2Fkernel%2Flinux.git

configfs: Introduce config_item_get_unless_zero()

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
[hch: minor style tweak]
Signed-off-by: Christoph Hellwig <hch@lst.de>
---

diff --git a/fs/configfs/item.c b/fs/configfs/item.c
index 8b2a994042dde..a66f6624d8994 100644
--- a/fs/configfs/item.c
+++ b/fs/configfs/item.c
@@ -138,6 +138,14 @@ struct config_item *config_item_get(struct config_item *item)
 }
 EXPORT_SYMBOL(config_item_get);
 
+struct config_item *config_item_get_unless_zero(struct config_item *item)
+{
+	if (item && kref_get_unless_zero(&item->ci_kref))
+		return item;
+	return NULL;
+}
+EXPORT_SYMBOL(config_item_get_unless_zero);
+
 static void config_item_cleanup(struct config_item *item)
 {
 	struct config_item_type *t = item->ci_type;
diff --git a/include/linux/configfs.h b/include/linux/configfs.h
index 2319b8c108e87..c967090496832 100644
--- a/include/linux/configfs.h
+++ b/include/linux/configfs.h
@@ -74,7 +74,8 @@ extern void config_item_init_type_name(struct config_item *item,
 				       const char *name,
 				       struct config_item_type *type);
 
-extern struct config_item * config_item_get(struct config_item *);
+extern struct config_item *config_item_get(struct config_item *);
+extern struct config_item *config_item_get_unless_zero(struct config_item *);
 extern void config_item_put(struct config_item *);
 
 struct config_item_type {