sysfs: Update the name hash when renaming sysfs entries

This fixes a bug introduced with sysfs name hashes where renaming a
network device appears to succeed but silently makes the sysfs files for
that network device inaccessible.

In at least one configuration this bug has stopped networking from
coming up during boot.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Tested-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index ea64d01400ac..dd3779cf3a3b 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -872,6 +872,7 @@ int sysfs_rename(struct sysfs_dirent *sd,
 
                 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. */