1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
/******************************************************************************
*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2007 - 2014 Intel Corporation. All rights reserved.
* Copyright(c) 2015 Intel Deutschland GmbH
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
* USA
*
* The full GNU General Public License is included in this distribution
* in the file called COPYING.
*
* Contact Information:
* Intel Linux Wireless <linuxwifi@intel.com>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*
* BSD LICENSE
*
* Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*****************************************************************************/
#include <linux/sched.h>
#include <linux/export.h>
#include "iwl-drv.h"
#include "iwl-notif-wait.h"
void iwl_notification_wait_init(struct iwl_notif_wait_data *notif_wait)
{
spin_lock_init(¬if_wait->notif_wait_lock);
INIT_LIST_HEAD(¬if_wait->notif_waits);
init_waitqueue_head(¬if_wait->notif_waitq);
}
IWL_EXPORT_SYMBOL(iwl_notification_wait_init);
void iwl_notification_wait_notify(struct iwl_notif_wait_data *notif_wait,
struct iwl_rx_packet *pkt)
{
bool triggered = false;
if (!list_empty(¬if_wait->notif_waits)) {
struct iwl_notification_wait *w;
spin_lock(¬if_wait->notif_wait_lock);
list_for_each_entry(w, ¬if_wait->notif_waits, list) {
int i;
bool found = false;
/*
* If it already finished (triggered) or has been
* aborted then don't evaluate it again to avoid races,
* Otherwise the function could be called again even
* though it returned true before
*/
if (w->triggered || w->aborted)
continue;
for (i = 0; i < w->n_cmds; i++) {
if (w->cmds[i] ==
WIDE_ID(pkt->hdr.group_id, pkt->hdr.cmd)) {
found = true;
break;
}
}
if (!found)
continue;
if (!w->fn || w->fn(notif_wait, pkt, w->fn_data)) {
w->triggered = true;
triggered = true;
}
}
spin_unlock(¬if_wait->notif_wait_lock);
}
if (triggered)
wake_up_all(¬if_wait->notif_waitq);
}
IWL_EXPORT_SYMBOL(iwl_notification_wait_notify);
void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_wait)
{
struct iwl_notification_wait *wait_entry;
spin_lock(¬if_wait->notif_wait_lock);
list_for_each_entry(wait_entry, ¬if_wait->notif_waits, list)
wait_entry->aborted = true;
spin_unlock(¬if_wait->notif_wait_lock);
wake_up_all(¬if_wait->notif_waitq);
}
IWL_EXPORT_SYMBOL(iwl_abort_notification_waits);
void
iwl_init_notification_wait(struct iwl_notif_wait_data *notif_wait,
struct iwl_notification_wait *wait_entry,
const u16 *cmds, int n_cmds,
bool (*fn)(struct iwl_notif_wait_data *notif_wait,
struct iwl_rx_packet *pkt, void *data),
void *fn_data)
{
if (WARN_ON(n_cmds > MAX_NOTIF_CMDS))
n_cmds = MAX_NOTIF_CMDS;
wait_entry->fn = fn;
wait_entry->fn_data = fn_data;
wait_entry->n_cmds = n_cmds;
memcpy(wait_entry->cmds, cmds, n_cmds * sizeof(u16));
wait_entry->triggered = false;
wait_entry->aborted = false;
spin_lock_bh(¬if_wait->notif_wait_lock);
list_add(&wait_entry->list, ¬if_wait->notif_waits);
spin_unlock_bh(¬if_wait->notif_wait_lock);
}
IWL_EXPORT_SYMBOL(iwl_init_notification_wait);
int iwl_wait_notification(struct iwl_notif_wait_data *notif_wait,
struct iwl_notification_wait *wait_entry,
unsigned long timeout)
{
int ret;
ret = wait_event_timeout(notif_wait->notif_waitq,
wait_entry->triggered || wait_entry->aborted,
timeout);
spin_lock_bh(¬if_wait->notif_wait_lock);
list_del(&wait_entry->list);
spin_unlock_bh(¬if_wait->notif_wait_lock);
if (wait_entry->aborted)
return -EIO;
/* return value is always >= 0 */
if (ret <= 0)
return -ETIMEDOUT;
return 0;
}
IWL_EXPORT_SYMBOL(iwl_wait_notification);
void iwl_remove_notification(struct iwl_notif_wait_data *notif_wait,
struct iwl_notification_wait *wait_entry)
{
spin_lock_bh(¬if_wait->notif_wait_lock);
list_del(&wait_entry->list);
spin_unlock_bh(¬if_wait->notif_wait_lock);
}
IWL_EXPORT_SYMBOL(iwl_remove_notification);
|
