iwl-notif-wait.c

/******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
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 *
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 *
 * Copyright(c) 2007 - 2012 Intel Corporation. All rights reserved.
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 * 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
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 * General Public License for more details.
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 * along with this program; if not, write to the Free Software
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 * USA
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 * in the file called LICENSE.GPL.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * 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.
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 *****************************************************************************/
#include <linux/sched.h>

#include "iwl-notif-wait.h"


void iwl_notification_wait_init(struct iwl_notif_wait_data *notif_wait)
{
	spin_lock_init(&notif_wait->notif_wait_lock);
	INIT_LIST_HEAD(&notif_wait->notif_waits);
	init_waitqueue_head(&notif_wait->notif_waitq);
}

void iwl_notification_wait_notify(struct iwl_notif_wait_data *notif_wait,
				  struct iwl_rx_packet *pkt)
{
	bool triggered = false;

	if (!list_empty(&notif_wait->notif_waits)) {
		struct iwl_notification_wait *w;

		spin_lock(&notif_wait->notif_wait_lock);
		list_for_each_entry(w, &notif_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(&notif_wait->notif_wait_lock);

	}

	if (triggered)
		wake_up_all(&notif_wait->notif_waitq);
}

void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_wait)
{
	unsigned long flags;
	struct iwl_notification_wait *wait_entry;

	spin_lock_irqsave(&notif_wait->notif_wait_lock, flags);
	list_for_each_entry(wait_entry, &notif_wait->notif_waits, list)
		wait_entry->aborted = true;
	spin_unlock_irqrestore(&notif_wait->notif_wait_lock, flags);

	wake_up_all(&notif_wait->notif_waitq);
}


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(&notif_wait->notif_wait_lock);
	list_add(&wait_entry->list, &notif_wait->notif_waits);
	spin_unlock_bh(&notif_wait->notif_wait_lock);
}

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(&notif_wait->notif_wait_lock);
	list_del(&wait_entry->list);
	spin_unlock_bh(&notif_wait->notif_wait_lock);

	if (wait_entry->aborted)
		return -EIO;

	/* return value is always >= 0 */
	if (ret <= 0)
		return -ETIMEDOUT;
	return 0;
}

void iwl_remove_notification(struct iwl_notif_wait_data *notif_wait,
			     struct iwl_notification_wait *wait_entry)
{
	spin_lock_bh(&notif_wait->notif_wait_lock);
	list_del(&wait_entry->list);
	spin_unlock_bh(&notif_wait->notif_wait_lock);
}