configfs: use kvasprintf() instead of open-coding it

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

fs/configfs/item.c

@@ -64,7 +64,6 @@ static void config_item_init(struct config_item *item)
  */
 int config_item_set_name(struct config_item *item, const char *fmt, ...)
 {
-	int error = 0;
 	int limit = CONFIGFS_ITEM_NAME_LEN;
 	int need;
 	va_list args;
@@ -79,25 +78,11 @@ int config_item_set_name(struct config_item *item, const char *fmt, ...)
 	if (need < limit)
 		name = item->ci_namebuf;
 	else {
-		/*
-		 * Need more space? Allocate it and try again
-		 */
-		limit = need + 1;
-		name = kmalloc(limit, GFP_KERNEL);
-		if (!name) {
-			error = -ENOMEM;
-			goto Done;
-		}
 		va_start(args, fmt);
-		need = vsnprintf(name, limit, fmt, args);
+		name = kvasprintf(GFP_KERNEL, fmt, args);
 		va_end(args);
-
-		/* Still? Give up. */
-		if (need >= limit) {
-			kfree(name);
-			error = -EFAULT;
-			goto Done;
-		}
+		if (!name)
+			return -EFAULT;
 	}
 
 	/* Free the old name, if necessary. */
@@ -106,8 +91,7 @@ int config_item_set_name(struct config_item *item, const char *fmt, ...)
 
 	/* Now, set the new name */
 	item->ci_name = name;
- Done:
-	return error;
+	return 0;
 }
 EXPORT_SYMBOL(config_item_set_name);