sysfs: make sysfs_put() ignore NULL sd
authorTejun Heo <htejun@gmail.com>
Wed, 13 Jun 2007 18:45:13 +0000 (03:45 +0900)
committerGreg Kroah-Hartman <gregkh@suse.de>
Wed, 11 Jul 2007 23:09:03 +0000 (16:09 -0700)
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

index 687d959f606d10093bab92a17a23affe320c435d..f4fdbbffd5715f72c60bc0fd6e71442262f7d79f 100644 (file)
@@ -111,7 +111,7 @@ static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd)
 
 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);
 }