/****************************************************************************** * * 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 - 2012 Intel Corporation. All rights reserved. * * 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 LICENSE.GPL. * * Contact Information: * Intel Linux Wireless * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 * * BSD LICENSE * * Copyright(c) 2005 - 2012 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 #include #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); } EXPORT_SYMBOL_GPL(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] == 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); } EXPORT_SYMBOL_GPL(iwl_notification_wait_notify); void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_wait) { unsigned long flags; struct iwl_notification_wait *wait_entry; spin_lock_irqsave(¬if_wait->notif_wait_lock, flags); list_for_each_entry(wait_entry, ¬if_wait->notif_waits, list) wait_entry->aborted = true; spin_unlock_irqrestore(¬if_wait->notif_wait_lock, flags); wake_up_all(¬if_wait->notif_waitq); } EXPORT_SYMBOL_GPL(iwl_abort_notification_waits); void iwl_init_notification_wait(struct iwl_notif_wait_data *notif_wait, struct iwl_notification_wait *wait_entry, const u8 *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); 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); } EXPORT_SYMBOL_GPL(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; } EXPORT_SYMBOL_GPL(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); } EXPORT_SYMBOL_GPL(iwl_remove_notification);