191 lines
6.2 KiB
C
191 lines
6.2 KiB
C
/******************************************************************************
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* Copyright(c) 2007 - 2013 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
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* USA
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*
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* The full GNU General Public License is included in this distribution
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* in the file called LICENSE.GPL.
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*
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* Contact Information:
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* Intel Linux Wireless <ilw@linux.intel.com>
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* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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*
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* BSD LICENSE
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*
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* Copyright(c) 2005 - 2013 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*****************************************************************************/
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#include <linux/sched.h>
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#include <linux/export.h>
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#include "iwl-notif-wait.h"
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void iwl_notification_wait_init(struct iwl_notif_wait_data *notif_wait)
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{
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spin_lock_init(¬if_wait->notif_wait_lock);
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INIT_LIST_HEAD(¬if_wait->notif_waits);
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init_waitqueue_head(¬if_wait->notif_waitq);
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}
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EXPORT_SYMBOL_GPL(iwl_notification_wait_init);
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void iwl_notification_wait_notify(struct iwl_notif_wait_data *notif_wait,
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struct iwl_rx_packet *pkt)
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{
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bool triggered = false;
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if (!list_empty(¬if_wait->notif_waits)) {
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struct iwl_notification_wait *w;
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spin_lock(¬if_wait->notif_wait_lock);
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list_for_each_entry(w, ¬if_wait->notif_waits, list) {
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int i;
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bool found = false;
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/*
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* If it already finished (triggered) or has been
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* aborted then don't evaluate it again to avoid races,
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* Otherwise the function could be called again even
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* though it returned true before
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*/
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if (w->triggered || w->aborted)
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continue;
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for (i = 0; i < w->n_cmds; i++) {
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if (w->cmds[i] == pkt->hdr.cmd) {
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found = true;
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break;
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}
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}
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if (!found)
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continue;
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if (!w->fn || w->fn(notif_wait, pkt, w->fn_data)) {
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w->triggered = true;
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triggered = true;
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}
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}
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spin_unlock(¬if_wait->notif_wait_lock);
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}
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if (triggered)
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wake_up_all(¬if_wait->notif_waitq);
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}
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EXPORT_SYMBOL_GPL(iwl_notification_wait_notify);
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void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_wait)
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{
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struct iwl_notification_wait *wait_entry;
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spin_lock(¬if_wait->notif_wait_lock);
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list_for_each_entry(wait_entry, ¬if_wait->notif_waits, list)
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wait_entry->aborted = true;
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spin_unlock(¬if_wait->notif_wait_lock);
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wake_up_all(¬if_wait->notif_waitq);
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}
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EXPORT_SYMBOL_GPL(iwl_abort_notification_waits);
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void
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iwl_init_notification_wait(struct iwl_notif_wait_data *notif_wait,
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struct iwl_notification_wait *wait_entry,
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const u8 *cmds, int n_cmds,
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bool (*fn)(struct iwl_notif_wait_data *notif_wait,
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struct iwl_rx_packet *pkt, void *data),
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void *fn_data)
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{
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if (WARN_ON(n_cmds > MAX_NOTIF_CMDS))
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n_cmds = MAX_NOTIF_CMDS;
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wait_entry->fn = fn;
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wait_entry->fn_data = fn_data;
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wait_entry->n_cmds = n_cmds;
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memcpy(wait_entry->cmds, cmds, n_cmds);
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wait_entry->triggered = false;
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wait_entry->aborted = false;
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spin_lock_bh(¬if_wait->notif_wait_lock);
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list_add(&wait_entry->list, ¬if_wait->notif_waits);
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spin_unlock_bh(¬if_wait->notif_wait_lock);
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}
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EXPORT_SYMBOL_GPL(iwl_init_notification_wait);
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int iwl_wait_notification(struct iwl_notif_wait_data *notif_wait,
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struct iwl_notification_wait *wait_entry,
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unsigned long timeout)
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{
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int ret;
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ret = wait_event_timeout(notif_wait->notif_waitq,
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wait_entry->triggered || wait_entry->aborted,
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timeout);
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spin_lock_bh(¬if_wait->notif_wait_lock);
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list_del(&wait_entry->list);
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spin_unlock_bh(¬if_wait->notif_wait_lock);
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if (wait_entry->aborted)
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return -EIO;
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/* return value is always >= 0 */
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if (ret <= 0)
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return -ETIMEDOUT;
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return 0;
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}
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EXPORT_SYMBOL_GPL(iwl_wait_notification);
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void iwl_remove_notification(struct iwl_notif_wait_data *notif_wait,
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struct iwl_notification_wait *wait_entry)
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{
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spin_lock_bh(¬if_wait->notif_wait_lock);
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list_del(&wait_entry->list);
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spin_unlock_bh(¬if_wait->notif_wait_lock);
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}
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EXPORT_SYMBOL_GPL(iwl_remove_notification);
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