sysfs: Only take active references on attributes.

If we exclude directories and symlinks from the set of sysfs
dirents where we need active references we are left with
sysfs attributes (binary or not).

- Tweak sysfs_deactivate to only do something on attributes
- Move lockdep initialization into sysfs_file_add_mode to
  limit it to just attributes.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: WANG Cong <xiyou.wangcong@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index 40961366e92..e222b258274 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -509,6 +509,7 @@ int sysfs_add_file_mode(struct sysfs_dirent *dir_sd,
 	if (!sd)
 		return -ENOMEM;
 	sd->s_attr.attr = (void *)attr;
+	sysfs_dirent_init_lockdep(sd);
 
 	sysfs_addrm_start(&acxt, dir_sd);
 	rc = sysfs_add_one(&acxt, sd);