From htejun@gmail.com  Fri Apr 20 11:00:10 2007
From: Tejun Heo <htejun@gmail.com>
Date: Sat, 21 Apr 2007 02:08:23 +0900
Subject: sysfs: make sysfs_put() ignore NULL sd
To: <gregkh@suse.de>, <maneesh@in.ibm.com>, <dmitry.torokhov@gmail.com>, <cornelia.huck@de.ibm.com>, <oneukum@suse.de>, <stern@rowland.harvard.edu>, htejun@gmail.com
Cc: Tejun Heo <htejun@gmail.com>
Message-ID: <11770889032044-git-send-email-htejun@gmail.com>


Make sysfs_put() ignore NULL sd instead of oopsing.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 fs/sysfs/sysfs.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -86,7 +86,7 @@ static inline struct sysfs_dirent * sysf
 
 static inline void sysfs_put(struct sysfs_dirent * sd)
 {
-	if (atomic_dec_and_test(&sd->s_count))
+	if (sd && atomic_dec_and_test(&sd->s_count))
 		release_sysfs_dirent(sd);
 }