text: /******************************************************************************
   *
   * GPL LICENSE SUMMARY
   *
   * Copyright(c) 2008 - 2011 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 <ilw@linux.intel.com>
   * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
   *****************************************************************************/
  #include <linux/slab.h>
  #include <linux/types.h>
  #include <linux/etherdevice.h>
  #include <net/mac80211.h>
  
  #include "iwl-eeprom.h"
  #include "iwl-dev.h"
  #include "iwl-core.h"
  #include "iwl-sta.h"
  #include "iwl-io.h"
  #include "iwl-helpers.h"
  
  /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
   * sending probe req.  This should be set long enough to hear probe responses
   * from more than one AP.  */
  #define IWL_ACTIVE_DWELL_TIME_24    (30)       /* all times in msec */
  #define IWL_ACTIVE_DWELL_TIME_52    (20)
  
  #define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
  #define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
  
  /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
   * Must be set longer than active dwell time.
   * For the most reliable scan, set > AP beacon interval (typically 100msec). */
  #define IWL_PASSIVE_DWELL_TIME_24   (20)       /* all times in msec */
  #define IWL_PASSIVE_DWELL_TIME_52   (10)
  #define IWL_PASSIVE_DWELL_BASE      (100)
  #define IWL_CHANNEL_TUNE_TIME       5
  
  static int iwl_legacy_send_scan_abort(struct iwl_priv *priv)
  {
  	int ret;
  	struct iwl_rx_packet *pkt;
  	struct iwl_host_cmd cmd = {
  		.id = REPLY_SCAN_ABORT_CMD,
  		.flags = CMD_WANT_SKB,
  	};
  
  	/* Exit instantly with error when device is not ready
  	 * to receive scan abort command or it does not perform
  	 * hardware scan currently */
  	if (!test_bit(STATUS_READY, &priv->status) ||
  	    !test_bit(STATUS_GEO_CONFIGURED, &priv->status) ||
  	    !test_bit(STATUS_SCAN_HW, &priv->status) ||
  	    test_bit(STATUS_FW_ERROR, &priv->status) ||
  	    test_bit(STATUS_EXIT_PENDING, &priv->status))
  		return -EIO;
  
  	ret = iwl_legacy_send_cmd_sync(priv, &cmd);
  	if (ret)
  		return ret;
  
  	pkt = (struct iwl_rx_packet *)cmd.reply_page;
  	if (pkt->u.status != CAN_ABORT_STATUS) {
  		/* The scan abort will return 1 for success or
  		 * 2 for "failure".  A failure condition can be
  		 * due to simply not being in an active scan which
  		 * can occur if we send the scan abort before we
  		 * the microcode has notified us that a scan is
  		 * completed. */
  		IWL_DEBUG_SCAN(priv, "SCAN_ABORT ret %d.\n", pkt->u.status);
  		ret = -EIO;
  	}
  
  	iwl_legacy_free_pages(priv, cmd.reply_page);
  	return ret;
  }
  
  static void iwl_legacy_complete_scan(struct iwl_priv *priv, bool aborted)
  {
  	/* check if scan was requested from mac80211 */
  	if (priv->scan_request) {
  		IWL_DEBUG_SCAN(priv, "Complete scan in mac80211\n");
  		ieee80211_scan_completed(priv->hw, aborted);
  	}
  
  	priv->is_internal_short_scan = false;
  	priv->scan_vif = NULL;
  	priv->scan_request = NULL;
  }
  
  void iwl_legacy_force_scan_end(struct iwl_priv *priv)
  {
  	lockdep_assert_held(&priv->mutex);
  
  	if (!test_bit(STATUS_SCANNING, &priv->status)) {
  		IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n");
  		return;
  	}
  
  	IWL_DEBUG_SCAN(priv, "Forcing scan end\n");
  	clear_bit(STATUS_SCANNING, &priv->status);
  	clear_bit(STATUS_SCAN_HW, &priv->status);
  	clear_bit(STATUS_SCAN_ABORTING, &priv->status);
  	iwl_legacy_complete_scan(priv, true);
  }
  
  static void iwl_legacy_do_scan_abort(struct iwl_priv *priv)
  {
  	int ret;
  
  	lockdep_assert_held(&priv->mutex);
  
  	if (!test_bit(STATUS_SCANNING, &priv->status)) {
  		IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n");
  		return;
  	}
  
  	if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) {
  		IWL_DEBUG_SCAN(priv, "Scan abort in progress\n");
  		return;
  	}
  
  	ret = iwl_legacy_send_scan_abort(priv);
  	if (ret) {
  		IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret);
  		iwl_legacy_force_scan_end(priv);
  	} else
  		IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n");
  }
  
  /**
   * iwl_scan_cancel - Cancel any currently executing HW scan
   */
  int iwl_legacy_scan_cancel(struct iwl_priv *priv)
  {
  	IWL_DEBUG_SCAN(priv, "Queuing abort scan\n");
  	queue_work(priv->workqueue, &priv->abort_scan);
  	return 0;
  }
  EXPORT_SYMBOL(iwl_legacy_scan_cancel);
  
  /**
   * iwl_legacy_scan_cancel_timeout - Cancel any currently executing HW scan
   * @ms: amount of time to wait (in milliseconds) for scan to abort
   *
   */
  int iwl_legacy_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
  {
  	unsigned long timeout = jiffies + msecs_to_jiffies(ms);
  
  	lockdep_assert_held(&priv->mutex);
  
  	IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n");
  
  	iwl_legacy_do_scan_abort(priv);
  
  	while (time_before_eq(jiffies, timeout)) {
  		if (!test_bit(STATUS_SCAN_HW, &priv->status))
  			break;
  		msleep(20);
  	}
  
  	return test_bit(STATUS_SCAN_HW, &priv->status);
  }
  EXPORT_SYMBOL(iwl_legacy_scan_cancel_timeout);
  
  /* Service response to REPLY_SCAN_CMD (0x80) */
  static void iwl_legacy_rx_reply_scan(struct iwl_priv *priv,
  			      struct iwl_rx_mem_buffer *rxb)
  {
  #ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
  	struct iwl_rx_packet *pkt = rxb_addr(rxb);
  	struct iwl_scanreq_notification *notif =
  	    (struct iwl_scanreq_notification *)pkt->u.raw;
  
  	IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status);
  #endif
  }
  
  /* Service SCAN_START_NOTIFICATION (0x82) */
  static void iwl_legacy_rx_scan_start_notif(struct iwl_priv *priv,
  				    struct iwl_rx_mem_buffer *rxb)
  {
  	struct iwl_rx_packet *pkt = rxb_addr(rxb);
  	struct iwl_scanstart_notification *notif =
  	    (struct iwl_scanstart_notification *)pkt->u.raw;
  	priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
  	IWL_DEBUG_SCAN(priv, "Scan start: "
  		       "%d [802.11%s] "
  		       "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
  		       notif->channel,
  		       notif->band ? "bg" : "a",
  		       le32_to_cpu(notif->tsf_high),
  		       le32_to_cpu(notif->tsf_low),
  		       notif->status, notif->beacon_timer);
  }
  
  /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
  static void iwl_legacy_rx_scan_results_notif(struct iwl_priv *priv,
  				      struct iwl_rx_mem_buffer *rxb)
  {
  #ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
  	struct iwl_rx_packet *pkt = rxb_addr(rxb);
  	struct iwl_scanresults_notification *notif =
  	    (struct iwl_scanresults_notification *)pkt->u.raw;
  
  	IWL_DEBUG_SCAN(priv, "Scan ch.res: "
  		       "%d [802.11%s] "
  		       "(TSF: 0x%08X:%08X) - %d "
  		       "elapsed=%lu usec\n",
  		       notif->channel,
  		       notif->band ? "bg" : "a",
  		       le32_to_cpu(notif->tsf_high),
  		       le32_to_cpu(notif->tsf_low),
  		       le32_to_cpu(notif->statistics[0]),
  		       le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
  #endif
  }
  
  /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
  static void iwl_legacy_rx_scan_complete_notif(struct iwl_priv *priv,
  				       struct iwl_rx_mem_buffer *rxb)
  {
  
  #ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
  	struct iwl_rx_packet *pkt = rxb_addr(rxb);
  	struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
  #endif
  
  	IWL_DEBUG_SCAN(priv,
  			"Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
  		       scan_notif->scanned_channels,
  		       scan_notif->tsf_low,
  		       scan_notif->tsf_high, scan_notif->status);
  
  	/* The HW is no longer scanning */
  	clear_bit(STATUS_SCAN_HW, &priv->status);
  
  	IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n",
  		       (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
  		       jiffies_to_msecs(jiffies - priv->scan_start));
  
  	queue_work(priv->workqueue, &priv->scan_completed);
  }
  
  void iwl_legacy_setup_rx_scan_handlers(struct iwl_priv *priv)
  {
  	/* scan handlers */
  	priv->rx_handlers[REPLY_SCAN_CMD] = iwl_legacy_rx_reply_scan;
  	priv->rx_handlers[SCAN_START_NOTIFICATION] =
  					iwl_legacy_rx_scan_start_notif;
  	priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
  					iwl_legacy_rx_scan_results_notif;
  	priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
  					iwl_legacy_rx_scan_complete_notif;
  }
  EXPORT_SYMBOL(iwl_legacy_setup_rx_scan_handlers);
  
  inline u16 iwl_legacy_get_active_dwell_time(struct iwl_priv *priv,
  				     enum ieee80211_band band,
  				     u8 n_probes)
  {
  	if (band == IEEE80211_BAND_5GHZ)
  		return IWL_ACTIVE_DWELL_TIME_52 +
  			IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
  	else
  		return IWL_ACTIVE_DWELL_TIME_24 +
  			IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
  }
  EXPORT_SYMBOL(iwl_legacy_get_active_dwell_time);
  
  u16 iwl_legacy_get_passive_dwell_time(struct iwl_priv *priv,
  			       enum ieee80211_band band,
  			       struct ieee80211_vif *vif)
  {
  	struct iwl_rxon_context *ctx;
  	u16 passive = (band == IEEE80211_BAND_2GHZ) ?
  	    IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
  	    IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
  
  	if (iwl_legacy_is_any_associated(priv)) {
  		/*
  		 * If we're associated, we clamp the maximum passive
  		 * dwell time to be 98% of the smallest beacon interval
  		 * (minus 2 * channel tune time)
  		 */
  		for_each_context(priv, ctx) {
  			u16 value;
  
  			if (!iwl_legacy_is_associated_ctx(ctx))
  				continue;
  			value = ctx->vif ? ctx->vif->bss_conf.beacon_int : 0;
  			if ((value > IWL_PASSIVE_DWELL_BASE) || !value)
  				value = IWL_PASSIVE_DWELL_BASE;
  			value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
  			passive = min(value, passive);
  		}
  	}
  
  	return passive;
  }
  EXPORT_SYMBOL(iwl_legacy_get_passive_dwell_time);
  
  void iwl_legacy_init_scan_params(struct iwl_priv *priv)
  {
  	u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
  	if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
  		priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
  	if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
  		priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
  }
  EXPORT_SYMBOL(iwl_legacy_init_scan_params);
  
  static int __must_check iwl_legacy_scan_initiate(struct iwl_priv *priv,
  					  struct ieee80211_vif *vif,
  					  bool internal,
  					  enum ieee80211_band band)
  {
  	int ret;
  
  	lockdep_assert_held(&priv->mutex);
  
  	if (WARN_ON(!priv->cfg->ops->utils->request_scan))
  		return -EOPNOTSUPP;
  
  	cancel_delayed_work(&priv->scan_check);
  
  	if (!iwl_legacy_is_ready_rf(priv)) {
  		IWL_WARN(priv, "Request scan called when driver not ready.\n");
  		return -EIO;
  	}
  
  	if (test_bit(STATUS_SCAN_HW, &priv->status)) {
  		IWL_DEBUG_SCAN(priv,
  			"Multiple concurrent scan requests in parallel.\n");
  		return -EBUSY;
  	}
  
  	if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
  		IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n");
  		return -EBUSY;
  	}
  
  	IWL_DEBUG_SCAN(priv, "Starting %sscan...\n",
  			internal ? "internal short " : "");
  
  	set_bit(STATUS_SCANNING, &priv->status);
  	priv->is_internal_short_scan = internal;
  	priv->scan_start = jiffies;
  	priv->scan_band = band;
  
  	ret = priv->cfg->ops->utils->request_scan(priv, vif);
  	if (ret) {
  		clear_bit(STATUS_SCANNING, &priv->status);
  		priv->is_internal_short_scan = false;
  		return ret;
  	}
  
  	queue_delayed_work(priv->workqueue, &priv->scan_check,
  			   IWL_SCAN_CHECK_WATCHDOG);
  
  	return 0;
  }
  
  int iwl_legacy_mac_hw_scan(struct ieee80211_hw *hw,
  		    struct ieee80211_vif *vif,
  		    struct cfg80211_scan_request *req)
  {
  	struct iwl_priv *priv = hw->priv;
  	int ret;
  
  	IWL_DEBUG_MAC80211(priv, "enter\n");
  
  	if (req->n_channels == 0)
  		return -EINVAL;
  
  	mutex_lock(&priv->mutex);
  
  	if (test_bit(STATUS_SCANNING, &priv->status) &&
  	    !priv->is_internal_short_scan) {
  		IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
  		ret = -EAGAIN;
  		goto out_unlock;
  	}
  
  	/* mac80211 will only ask for one band at a time */
  	priv->scan_request = req;
  	priv->scan_vif = vif;
  
  	/*
  	 * If an internal scan is in progress, just set
  	 * up the scan_request as per above.
  	 */
  	if (priv->is_internal_short_scan) {
  		IWL_DEBUG_SCAN(priv, "SCAN request during internal scan\n");
  		ret = 0;
  	} else
  		ret = iwl_legacy_scan_initiate(priv, vif, false,
  					req->channels[0]->band);
  
  	IWL_DEBUG_MAC80211(priv, "leave\n");
  
  out_unlock:
  	mutex_unlock(&priv->mutex);
  
  	return ret;
  }
  EXPORT_SYMBOL(iwl_legacy_mac_hw_scan);
  
  /*
   * internal short scan, this function should only been called while associated.
   * It will reset and tune the radio to prevent possible RF related problem
   */
  void iwl_legacy_internal_short_hw_scan(struct iwl_priv *priv)
  {
  	queue_work(priv->workqueue, &priv->start_internal_scan);
  }
  
  static void iwl_legacy_bg_start_internal_scan(struct work_struct *work)
  {
  	struct iwl_priv *priv =
  		container_of(work, struct iwl_priv, start_internal_scan);
  
  	IWL_DEBUG_SCAN(priv, "Start internal scan\n");
  
  	mutex_lock(&priv->mutex);
  
  	if (priv->is_internal_short_scan == true) {
  		IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
  		goto unlock;
  	}
  
  	if (test_bit(STATUS_SCANNING, &priv->status)) {
  		IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
  		goto unlock;
  	}
  
  	if (iwl_legacy_scan_initiate(priv, NULL, true, priv->band))
  		IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
   unlock:
  	mutex_unlock(&priv->mutex);
  }
  
  static void iwl_legacy_bg_scan_check(struct work_struct *data)
  {
  	struct iwl_priv *priv =
  	    container_of(data, struct iwl_priv, scan_check.work);
  
  	IWL_DEBUG_SCAN(priv, "Scan check work\n");
  
  	/* Since we are here firmware does not finish scan and
  	 * most likely is in bad shape, so we don't bother to
  	 * send abort command, just force scan complete to mac80211 */
  	mutex_lock(&priv->mutex);
  	iwl_legacy_force_scan_end(priv);
  	mutex_unlock(&priv->mutex);
  }
  
  /**
   * iwl_legacy_fill_probe_req - fill in all required fields and IE for probe request
   */
  
  u16
  iwl_legacy_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
  		       const u8 *ta, const u8 *ies, int ie_len, int left)
  {
  	int len = 0;
  	u8 *pos = NULL;
  
  	/* Make sure there is enough space for the probe request,
  	 * two mandatory IEs and the data */
  	left -= 24;
  	if (left < 0)
  		return 0;
  
  	frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
  	memcpy(frame->da, iwlegacy_bcast_addr, ETH_ALEN);
  	memcpy(frame->sa, ta, ETH_ALEN);
  	memcpy(frame->bssid, iwlegacy_bcast_addr, ETH_ALEN);
  	frame->seq_ctrl = 0;
  
  	len += 24;
  
  	/* ...next IE... */
  	pos = &frame->u.probe_req.variable[0];
  
  	/* fill in our indirect SSID IE */
  	left -= 2;
  	if (left < 0)
  		return 0;
  	*pos++ = WLAN_EID_SSID;
  	*pos++ = 0;
  
  	len += 2;
  
  	if (WARN_ON(left < ie_len))
  		return len;
  
  	if (ies && ie_len) {
  		memcpy(pos, ies, ie_len);
  		len += ie_len;
  	}
  
  	return (u16)len;
  }
  EXPORT_SYMBOL(iwl_legacy_fill_probe_req);
  
  static void iwl_legacy_bg_abort_scan(struct work_struct *work)
  {
  	struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
  
  	IWL_DEBUG_SCAN(priv, "Abort scan work\n");
  
  	/* We keep scan_check work queued in case when firmware will not
  	 * report back scan completed notification */
  	mutex_lock(&priv->mutex);
  	iwl_legacy_scan_cancel_timeout(priv, 200);
  	mutex_unlock(&priv->mutex);
  }
  
  static void iwl_legacy_bg_scan_completed(struct work_struct *work)
  {
  	struct iwl_priv *priv =
  	    container_of(work, struct iwl_priv, scan_completed);
  	bool aborted;
  
  	IWL_DEBUG_SCAN(priv, "Completed %sscan.\n",
  		       priv->is_internal_short_scan ? "internal short " : "");
  
  	cancel_delayed_work(&priv->scan_check);
  
  	mutex_lock(&priv->mutex);
  
  	aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status);
  	if (aborted)
  		IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n");
  
  	if (!test_and_clear_bit(STATUS_SCANNING, &priv->status)) {
  		IWL_DEBUG_SCAN(priv, "Scan already completed.\n");
  		goto out_settings;
  	}
  
  	if (priv->is_internal_short_scan && !aborted) {
  		int err;
  
  		/* Check if mac80211 requested scan during our internal scan */
  		if (priv->scan_request == NULL)
  			goto out_complete;
  
  		/* If so request a new scan */
  		err = iwl_legacy_scan_initiate(priv, priv->scan_vif, false,
  					priv->scan_request->channels[0]->band);
  		if (err) {
  			IWL_DEBUG_SCAN(priv,
  				"failed to initiate pending scan: %d\n", err);
  			aborted = true;
  			goto out_complete;
  		}
  
  		goto out;
  	}
  
  out_complete:
  	iwl_legacy_complete_scan(priv, aborted);
  
  out_settings:
  	/* Can we still talk to firmware ? */
  	if (!iwl_legacy_is_ready_rf(priv))
  		goto out;
  
  	/*
  	 * We do not commit power settings while scan is pending,
  	 * do it now if the settings changed.
  	 */
  	iwl_legacy_power_set_mode(priv, &priv->power_data.sleep_cmd_next,
  								false);
  	iwl_legacy_set_tx_power(priv, priv->tx_power_next, false);
  
  	priv->cfg->ops->utils->post_scan(priv);
  
  out:
  	mutex_unlock(&priv->mutex);
  }
  
  void iwl_legacy_setup_scan_deferred_work(struct iwl_priv *priv)
  {
  	INIT_WORK(&priv->scan_completed, iwl_legacy_bg_scan_completed);
  	INIT_WORK(&priv->abort_scan, iwl_legacy_bg_abort_scan);
  	INIT_WORK(&priv->start_internal_scan,
  				iwl_legacy_bg_start_internal_scan);
  	INIT_DELAYED_WORK(&priv->scan_check, iwl_legacy_bg_scan_check);
  }
  EXPORT_SYMBOL(iwl_legacy_setup_scan_deferred_work);
  
  void iwl_legacy_cancel_scan_deferred_work(struct iwl_priv *priv)
  {
  	cancel_work_sync(&priv->start_internal_scan);
  	cancel_work_sync(&priv->abort_scan);
  	cancel_work_sync(&priv->scan_completed);
  
  	if (cancel_delayed_work_sync(&priv->scan_check)) {
  		mutex_lock(&priv->mutex);
  		iwl_legacy_force_scan_end(priv);
  		mutex_unlock(&priv->mutex);
  	}
  }
  EXPORT_SYMBOL(iwl_legacy_cancel_scan_deferred_work);
  