Merge tag 'driver-core-3.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core fix from Greg KH:
 "Here is a single kernfs fix to resolve a much-reported lockdep issue
  with the removal of entries in sysfs"

* tag 'driver-core-3.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  kernfs: make kernfs_deactivate() honor KERNFS_LOCKDEP flag

1 files changed, 8 insertions, 4 deletions

diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index 5104cf5d25c5..bd6e18be6e1a 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -187,19 +187,23 @@ static void kernfs_deactivate(struct kernfs_node *kn)
 
         kn->u.completion = (void *)&wait;
 
-        rwsem_acquire(&kn->dep_map, 0, 0, _RET_IP_);
+        if (kn->flags & KERNFS_LOCKDEP)
+                rwsem_acquire(&kn->dep_map, 0, 0, _RET_IP_);
         /* atomic_add_return() is a mb(), put_active() will always see
          * the updated kn->u.completion.
          */
         v = atomic_add_return(KN_DEACTIVATED_BIAS, &kn->active);
 
         if (v != KN_DEACTIVATED_BIAS) {
-                lock_contended(&kn->dep_map, _RET_IP_);
+                if (kn->flags & KERNFS_LOCKDEP)
+                        lock_contended(&kn->dep_map, _RET_IP_);
                 wait_for_completion(&wait);
         }
 
-        lock_acquired(&kn->dep_map, _RET_IP_);
-        rwsem_release(&kn->dep_map, 1, _RET_IP_);
+        if (kn->flags & KERNFS_LOCKDEP) {
+                lock_acquired(&kn->dep_map, _RET_IP_);
+                rwsem_release(&kn->dep_map, 1, _RET_IP_);
+        }
 }
 
 /**