drivers/scsi/bfa/include/cs/bfa_wc.h

   1 /*
   2  * Copyright (c) 2005-2009 Brocade Communications Systems, Inc.
   3  * All rights reserved
   4  * www.brocade.com
   5  *
   6  * Linux driver for Brocade Fibre Channel Host Bus Adapter.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License (GPL) Version 2 as
  10  * published by the Free Software Foundation
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  */
  17
  18 /**
  19  *  bfa_wc.h Generic wait counter.
  20  */
  21
  22 #ifndef __BFA_WC_H__
  23 #define __BFA_WC_H__
  24
  25 typedef void (*bfa_wc_resume_t) (void *cbarg);
  26
  27 struct bfa_wc_s {
  28         bfa_wc_resume_t wc_resume;
  29         void            *wc_cbarg;
  30         int             wc_count;
  31 };
  32
  33 static inline void
  34 bfa_wc_up(struct bfa_wc_s *wc)
  35 {
  36         wc->wc_count++;
  37 }
  38
  39 static inline void
  40 bfa_wc_down(struct bfa_wc_s *wc)
  41 {
  42         wc->wc_count--;
  43         if (wc->wc_count == 0)
  44                 wc->wc_resume(wc->wc_cbarg);
  45 }
  46
  47 /**
  48  * Initialize a waiting counter.
  49  */
  50 static inline void
  51 bfa_wc_init(struct bfa_wc_s *wc, bfa_wc_resume_t wc_resume, void *wc_cbarg)
  52 {
  53         wc->wc_resume = wc_resume;
  54         wc->wc_cbarg = wc_cbarg;
  55         wc->wc_count = 0;
  56         bfa_wc_up(wc);
  57 }
  58
  59 /**
  60  * Wait for counter to reach zero
  61  */
  62 static inline void
  63 bfa_wc_wait(struct bfa_wc_s *wc)
  64 {
  65         bfa_wc_down(wc);
  66 }
  67
  68 #endif