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
bfa_wc_up(struct bfa_wc * wc)35 bfa_wc_up(struct bfa_wc *wc)
36 {
37 	wc->wc_count++;
38 }
39 
40 static inline void
bfa_wc_down(struct bfa_wc * wc)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
bfa_wc_init(struct bfa_wc * wc,bfa_wc_resume_t wc_resume,void * wc_cbarg)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
bfa_wc_wait(struct bfa_wc * wc)64 bfa_wc_wait(struct bfa_wc *wc)
65 {
66 	bfa_wc_down(wc);
67 }
68 
69 #endif
70