XXXX don't fail device detach when it's physically removed

*** 16,30 ****
--- 16,35 ----
   * fields enclosed by brackets "[]" replaced with your own identifying
   * information: Portions Copyright [yyyy] [name of copyright owner]
   *
   * CDDL HEADER END
   */
+ 
  /*
   * Copyright (c) 1991, 2010, Oracle and/or its affiliates. All rights reserved.
+  */
+ 
+ /*
   * Copyright 2012 Garrett D'Amore <garrett@damore.org>.  All rights reserved.
   * Copyright 2016 Joyent, Inc.
   * Copyright (c) 2016 by Delphix. All rights reserved.
+  * Copyright 2018 Nexenta Systems, Inc.
   */
  
  #ifndef _SYS_DDI_IMPLDEFS_H
  #define _SYS_DDI_IMPLDEFS_H
  
*** 208,217 ****
--- 213,223 ----
  
          uint_t          devi_state;             /* device/bus state flags */
                                                  /* see below for definitions */
          kcondvar_t      devi_cv;                /* cv */
          int             devi_ref;               /* reference count */
+         int             devi_gone;              /* devi gone, force clean */
  
          dacf_rsrvlist_t *devi_dacf_tasks;       /* dacf reservation queue */
  
          ddi_node_class_t devi_node_class;       /* Node class */
          int             devi_node_attributes;   /* Node attributes: See below */