sysfs: make sysfs_add_one() automatically check for duplicate entry

Make sysfs_add_one() check for duplicate entry and return -EEXIST if
such entry exists.  This simplifies node addition code a bit.

This patch doesn't introduce any noticeable behavior change.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 5 insertions, 7 deletions

diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index ea0e494d7d58..33bb3406dc49 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -397,6 +397,7 @@ int sysfs_add_file(struct sysfs_dirent *dir_sd, const struct attribute *attr,
         umode_t mode = (attr->mode & S_IALLUGO) | S_IFREG;
         struct sysfs_addrm_cxt acxt;
         struct sysfs_dirent *sd;
+        int rc;
 
         sd = sysfs_new_dirent(attr->name, mode, type);
         if (!sd)
@@ -404,16 +405,13 @@ int sysfs_add_file(struct sysfs_dirent *dir_sd, const struct attribute *attr,
         sd->s_elem.attr.attr = (void *)attr;
 
         sysfs_addrm_start(&acxt, dir_sd);
+        rc = sysfs_add_one(&acxt, sd);
+        sysfs_addrm_finish(&acxt);
 
-        if (!sysfs_find_dirent(dir_sd, attr->name))
-                sysfs_add_one(&acxt, sd);
-
-        if (!sysfs_addrm_finish(&acxt)) {
+        if (rc)
                 sysfs_put(sd);
-                return -EEXIST;
-        }
 
-        return 0;
+        return rc;
 }