configfs: Make configfs_new_dirent() return error code instead of NULL

This patch makes configfs_new_dirent return negative error code instead of NULL,
which will be useful in the next patch to differentiate ENOMEM from ENOENT.

Signed-off-by: Louis Rilling <Louis.Rilling@kerlabs.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>

diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index a08e5c2..918a332 100644 (file)
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -30,6 +30,7 @@
 #include <linux/mount.h>
 #include <linux/module.h>
 #include <linux/slab.h>
+#include <linux/err.h>
 
 #include <linux/configfs.h>
 #include "configfs_internal.h"
@@ -83,7 +84,7 @@ static struct configfs_dirent *configfs_new_dirent(struct configfs_dirent * pare
 
        sd = kmem_cache_zalloc(configfs_dir_cachep, GFP_KERNEL);
        if (!sd)
-               return NULL;
+               return ERR_PTR(-ENOMEM);
 
        atomic_set(&sd->s_count, 1);
        INIT_LIST_HEAD(&sd->s_links);
@@ -129,8 +130,8 @@ int configfs_make_dirent(struct configfs_dirent * parent_sd,
        struct configfs_dirent * sd;
 
        sd = configfs_new_dirent(parent_sd, element);
-       if (!sd)
-               return -ENOMEM;
+       if (IS_ERR(sd))
+               return PTR_ERR(sd);
 
        sd->s_mode = mode;
        sd->s_type = type;
@@ -1277,7 +1278,7 @@ static int configfs_dir_open(struct inode *inode, struct file *file)
        file->private_data = configfs_new_dirent(parent_sd, NULL);
        mutex_unlock(&dentry->d_inode->i_mutex);
 
-       return file->private_data ? 0 : -ENOMEM;
+       return IS_ERR(file->private_data) ? PTR_ERR(file->private_data) : 0;
 
 }