1 /******************************************************************************
3 * This file is provided under a dual BSD/GPLv2 license. When using or
4 * redistributing this file, you may do so under either license.
8 * Copyright(c) 2007 - 2014 Intel Corporation. All rights reserved.
9 * Copyright(c) 2015 Intel Deutschland GmbH
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of version 2 of the GNU General Public License as
13 * published by the Free Software Foundation.
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
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21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
25 * The full GNU General Public License is included in this distribution
26 * in the file called COPYING.
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29 * Intel Linux Wireless <linuxwifi@intel.com>
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34 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
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63 *****************************************************************************/
64 #include <linux/sched.h>
65 #include <linux/export.h>
68 #include "iwl-notif-wait.h"
71 void iwl_notification_wait_init(struct iwl_notif_wait_data *notif_wait)
73 spin_lock_init(¬if_wait->notif_wait_lock);
74 INIT_LIST_HEAD(¬if_wait->notif_waits);
75 init_waitqueue_head(¬if_wait->notif_waitq);
77 IWL_EXPORT_SYMBOL(iwl_notification_wait_init);
79 void iwl_notification_wait_notify(struct iwl_notif_wait_data *notif_wait,
80 struct iwl_rx_packet *pkt)
82 bool triggered = false;
84 if (!list_empty(¬if_wait->notif_waits)) {
85 struct iwl_notification_wait *w;
87 spin_lock(¬if_wait->notif_wait_lock);
88 list_for_each_entry(w, ¬if_wait->notif_waits, list) {
93 * If it already finished (triggered) or has been
94 * aborted then don't evaluate it again to avoid races,
95 * Otherwise the function could be called again even
96 * though it returned true before
98 if (w->triggered || w->aborted)
101 for (i = 0; i < w->n_cmds; i++) {
102 u16 rec_id = WIDE_ID(pkt->hdr.group_id,
105 if (w->cmds[i] == rec_id ||
106 (!iwl_cmd_groupid(w->cmds[i]) &&
107 DEF_ID(w->cmds[i]) == rec_id)) {
115 if (!w->fn || w->fn(notif_wait, pkt, w->fn_data)) {
120 spin_unlock(¬if_wait->notif_wait_lock);
125 wake_up_all(¬if_wait->notif_waitq);
127 IWL_EXPORT_SYMBOL(iwl_notification_wait_notify);
129 void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_wait)
131 struct iwl_notification_wait *wait_entry;
133 spin_lock(¬if_wait->notif_wait_lock);
134 list_for_each_entry(wait_entry, ¬if_wait->notif_waits, list)
135 wait_entry->aborted = true;
136 spin_unlock(¬if_wait->notif_wait_lock);
138 wake_up_all(¬if_wait->notif_waitq);
140 IWL_EXPORT_SYMBOL(iwl_abort_notification_waits);
143 iwl_init_notification_wait(struct iwl_notif_wait_data *notif_wait,
144 struct iwl_notification_wait *wait_entry,
145 const u16 *cmds, int n_cmds,
146 bool (*fn)(struct iwl_notif_wait_data *notif_wait,
147 struct iwl_rx_packet *pkt, void *data),
150 if (WARN_ON(n_cmds > MAX_NOTIF_CMDS))
151 n_cmds = MAX_NOTIF_CMDS;
154 wait_entry->fn_data = fn_data;
155 wait_entry->n_cmds = n_cmds;
156 memcpy(wait_entry->cmds, cmds, n_cmds * sizeof(u16));
157 wait_entry->triggered = false;
158 wait_entry->aborted = false;
160 spin_lock_bh(¬if_wait->notif_wait_lock);
161 list_add(&wait_entry->list, ¬if_wait->notif_waits);
162 spin_unlock_bh(¬if_wait->notif_wait_lock);
164 IWL_EXPORT_SYMBOL(iwl_init_notification_wait);
166 int iwl_wait_notification(struct iwl_notif_wait_data *notif_wait,
167 struct iwl_notification_wait *wait_entry,
168 unsigned long timeout)
172 ret = wait_event_timeout(notif_wait->notif_waitq,
173 wait_entry->triggered || wait_entry->aborted,
176 spin_lock_bh(¬if_wait->notif_wait_lock);
177 list_del(&wait_entry->list);
178 spin_unlock_bh(¬if_wait->notif_wait_lock);
180 if (wait_entry->aborted)
183 /* return value is always >= 0 */
188 IWL_EXPORT_SYMBOL(iwl_wait_notification);
190 void iwl_remove_notification(struct iwl_notif_wait_data *notif_wait,
191 struct iwl_notification_wait *wait_entry)
193 spin_lock_bh(¬if_wait->notif_wait_lock);
194 list_del(&wait_entry->list);
195 spin_unlock_bh(¬if_wait->notif_wait_lock);
197 IWL_EXPORT_SYMBOL(iwl_remove_notification);