sysfs: spit a warning to users when they try to create a duplicatesysfs file

[Greg KH]

We want to let people know when we create a duplicate sysfs file, as
they need to fix up their code.


Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 fs/sysfs/dir.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -428,8 +428,12 @@ void sysfs_addrm_start(struct sysfs_addr
  */
 int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
 {
-	if (sysfs_find_dirent(acxt->parent_sd, sd->s_name))
+	if (sysfs_find_dirent(acxt->parent_sd, sd->s_name)) {
+		printk(KERN_WARNING, "sysfs: duplicate filename '%s' "
+		       "can not be created\n", sd->s_name);
+		WARN_ON(1);
 		return -EEXIST;
+	}
 
 	sd->s_parent = sysfs_get(acxt->parent_sd);
 
-
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