sysfs: Update the name hash for an entry after changing the namespace

This is needed to allow renaming network devices that have been moved
to another network namespace.

Signed-off-by: Tom Goff <thomas.goff@boeing.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 2a7a3f5..8ddc102 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -878,7 +878,6 @@
 
 		dup_name = sd->s_name;
 		sd->s_name = new_name;
-		sd->s_hash = sysfs_name_hash(sd->s_ns, sd->s_name);
 	}
 
 	/* Move to the appropriate place in the appropriate directories rbtree. */
@@ -886,6 +885,7 @@
 	sysfs_get(new_parent_sd);
 	sysfs_put(sd->s_parent);
 	sd->s_ns = new_ns;
+	sd->s_hash = sysfs_name_hash(sd->s_ns, sd->s_name);
 	sd->s_parent = new_parent_sd;
 	sysfs_link_sibling(sd);