drivers/net/bna/bfa_wc.h

   1 /*
   2  * Linux network driver for Brocade Converged Network Adapter.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License (GPL) Version 2 as
   6  * published by the Free Software Foundation
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  */
  13 /*
  14  * Copyright (c) 2005-2010 Brocade Communications Systems, Inc.
  15  * All rights reserved
  16  * www.brocade.com
  17  */
  18
  19 /**
  20  * @file bfa_wc.h Generic wait counter.
  21  */
  22
  23 #ifndef __BFA_WC_H__
  24 #define __BFA_WC_H__
  25
  26 typedef void (*bfa_wc_resume_t) (void *cbarg);
  27
  28 struct bfa_wc {
  29         bfa_wc_resume_t wc_resume;
  30         void            *wc_cbarg;
  31         int             wc_count;
  32 };
  33
  34 static inline void
  35 bfa_wc_up(struct bfa_wc *wc)
  36 {
  37         wc->wc_count++;
  38 }
  39
  40 static inline void
  41 bfa_wc_down(struct bfa_wc *wc)
  42 {
  43         wc->wc_count--;
  44         if (wc->wc_count == 0)
  45                 wc->wc_resume(wc->wc_cbarg);
  46 }
  47
  48 /**
  49  * Initialize a waiting counter.
  50  */
  51 static inline void
  52 bfa_wc_init(struct bfa_wc *wc, bfa_wc_resume_t wc_resume, void *wc_cbarg)
  53 {
  54         wc->wc_resume = wc_resume;
  55         wc->wc_cbarg = wc_cbarg;
  56         wc->wc_count = 0;
  57         bfa_wc_up(wc);
  58 }
  59
  60 /**
  61  * Wait for counter to reach zero
  62  */
  63 static inline void
  64 bfa_wc_wait(struct bfa_wc *wc)
  65 {
  66         bfa_wc_down(wc);
  67 }
  68
  69 #endif