Subject: [PATCH] sysfs: Update the name hash when renaming sysfs entries

From: [email-masked] (Eric W. Biederman)
Date: Tue, 31 Jan 2012 06:40:26 -0800

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 <[email-masked]>
---
 fs/sysfs/dir.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index ea64d01..dd3779c 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. */
-- 
1.7.2.5