1 files changed, 169 insertions, 120 deletions

diff --git a/drivers/net/wireless/libertas/main.c b/drivers/net/wireless/libertas/main.c
index 4d4e2f3b66ac..406f54d40956 100644
--- a/drivers/net/wireless/libertas/main.c
+++ b/drivers/net/wireless/libertas/main.c
@@ -10,6 +10,7 @@
 #include <linux/netdevice.h>
 #include <linux/if_arp.h>
 #include <linux/kthread.h>
+#include <linux/kfifo.h>
 
 #include <net/iw_handler.h>
 #include <net/ieee80211.h>
@@ -19,8 +20,8 @@
 #include "dev.h"
 #include "wext.h"
 #include "debugfs.h"
+#include "scan.h"
 #include "assoc.h"
-#include "join.h"
 #include "cmd.h"
 
 #define DRIVER_RELEASE_VERSION "323.p0"
@@ -37,6 +38,11 @@ EXPORT_SYMBOL_GPL(lbs_debug);
 module_param_named(libertas_debug, lbs_debug, int, 0644);
 
 
+/* This global structure is used to send the confirm_sleep command as
+ * fast as possible down to the firmware. */
+struct cmd_confirm_sleep confirm_sleep;
+
+
 #define LBS_TX_PWR_DEFAULT		20	/*100mW */
 #define LBS_TX_PWR_US_DEFAULT		20	/*100mW */
 #define LBS_TX_PWR_JP_DEFAULT		16	/*50mW */
@@ -277,10 +283,10 @@ static ssize_t lbs_rtap_set(struct device *dev,
 	struct lbs_private *priv = to_net_dev(dev)->priv;
 
 	sscanf(buf, "%x", &monitor_mode);
-	if (monitor_mode != LBS_MONITOR_OFF) {
-		if(priv->monitormode == monitor_mode)
+	if (monitor_mode) {
+		if (priv->monitormode == monitor_mode)
 			return strlen(buf);
-		if (priv->monitormode == LBS_MONITOR_OFF) {
+		if (!priv->monitormode) {
 			if (priv->infra_open || priv->mesh_open)
 				return -EBUSY;
 			if (priv->mode == IW_MODE_INFRA)
@@ -293,9 +299,9 @@ static ssize_t lbs_rtap_set(struct device *dev,
 	}
 
 	else {
-		if (priv->monitormode == LBS_MONITOR_OFF)
+		if (!priv->monitormode)
 			return strlen(buf);
-		priv->monitormode = LBS_MONITOR_OFF;
+		priv->monitormode = 0;
 		lbs_remove_rtap(priv);
 
 		if (priv->currenttxskb) {
@@ -392,7 +398,7 @@ static int lbs_dev_open(struct net_device *dev)
 
 	spin_lock_irq(&priv->driver_lock);
 
-	if (priv->monitormode != LBS_MONITOR_OFF) {
+	if (priv->monitormode) {
 		ret = -EBUSY;
 		goto out;
 	}
@@ -475,10 +481,9 @@ static void lbs_tx_timeout(struct net_device *dev)
 
 	dev->trans_start = jiffies;
 
-	if (priv->currenttxskb) {
-		priv->eventcause = 0x01000000;
-		lbs_send_tx_feedback(priv);
-	}
+	if (priv->currenttxskb)
+		lbs_send_tx_feedback(priv, 0);
+
 	/* XX: Shouldn't we also call into the hw-specific driver
 	   to kick it somehow? */
 	lbs_host_to_card_done(priv);
@@ -531,34 +536,27 @@ static int lbs_set_mac_address(struct net_device *dev, void *addr)
 	int ret = 0;
 	struct lbs_private *priv = (struct lbs_private *) dev->priv;
 	struct sockaddr *phwaddr = addr;
+	struct cmd_ds_802_11_mac_address cmd;
 
 	lbs_deb_enter(LBS_DEB_NET);
 
 	/* In case it was called from the mesh device */
-	dev = priv->dev ;
-
-	memset(priv->current_addr, 0, ETH_ALEN);
-
-	/* dev->dev_addr is 8 bytes */
-	lbs_deb_hex(LBS_DEB_NET, "dev->dev_addr", dev->dev_addr, ETH_ALEN);
-
-	lbs_deb_hex(LBS_DEB_NET, "addr", phwaddr->sa_data, ETH_ALEN);
-	memcpy(priv->current_addr, phwaddr->sa_data, ETH_ALEN);
+	dev = priv->dev;
 
-	ret = lbs_prepare_and_send_command(priv, CMD_802_11_MAC_ADDRESS,
-				    CMD_ACT_SET,
-				    CMD_OPTION_WAITFORRSP, 0, NULL);
+	cmd.hdr.size = cpu_to_le16(sizeof(cmd));
+	cmd.action = cpu_to_le16(CMD_ACT_SET);
+	memcpy(cmd.macadd, phwaddr->sa_data, ETH_ALEN);
 
+	ret = lbs_cmd_with_response(priv, CMD_802_11_MAC_ADDRESS, &cmd);
 	if (ret) {
 		lbs_deb_net("set MAC address failed\n");
-		ret = -1;
 		goto done;
 	}
 
-	lbs_deb_hex(LBS_DEB_NET, "priv->macaddr", priv->current_addr, ETH_ALEN);
-	memcpy(dev->dev_addr, priv->current_addr, ETH_ALEN);
+	memcpy(priv->current_addr, phwaddr->sa_data, ETH_ALEN);
+	memcpy(dev->dev_addr, phwaddr->sa_data, ETH_ALEN);
 	if (priv->mesh_dev)
-		memcpy(priv->mesh_dev->dev_addr, priv->current_addr, ETH_ALEN);
+		memcpy(priv->mesh_dev->dev_addr, phwaddr->sa_data, ETH_ALEN);
 
 done:
 	lbs_deb_leave_args(LBS_DEB_NET, "ret %d", ret);
@@ -581,45 +579,45 @@ static int lbs_copy_multicast_address(struct lbs_private *priv,
 static void lbs_set_multicast_list(struct net_device *dev)
 {
 	struct lbs_private *priv = dev->priv;
-	int oldpacketfilter;
+	int old_mac_control;
 	DECLARE_MAC_BUF(mac);
 
 	lbs_deb_enter(LBS_DEB_NET);
 
-	oldpacketfilter = priv->currentpacketfilter;
+	old_mac_control = priv->mac_control;
 
 	if (dev->flags & IFF_PROMISC) {
 		lbs_deb_net("enable promiscuous mode\n");
-		priv->currentpacketfilter |=
+		priv->mac_control |=
 		    CMD_ACT_MAC_PROMISCUOUS_ENABLE;
-		priv->currentpacketfilter &=
+		priv->mac_control &=
 		    ~(CMD_ACT_MAC_ALL_MULTICAST_ENABLE |
 		      CMD_ACT_MAC_MULTICAST_ENABLE);
 	} else {
 		/* Multicast */
-		priv->currentpacketfilter &=
+		priv->mac_control &=
 		    ~CMD_ACT_MAC_PROMISCUOUS_ENABLE;
 
 		if (dev->flags & IFF_ALLMULTI || dev->mc_count >
 		    MRVDRV_MAX_MULTICAST_LIST_SIZE) {
 			lbs_deb_net( "enabling all multicast\n");
-			priv->currentpacketfilter |=
+			priv->mac_control |=
 			    CMD_ACT_MAC_ALL_MULTICAST_ENABLE;
-			priv->currentpacketfilter &=
+			priv->mac_control &=
 			    ~CMD_ACT_MAC_MULTICAST_ENABLE;
 		} else {
-			priv->currentpacketfilter &=
+			priv->mac_control &=
 			    ~CMD_ACT_MAC_ALL_MULTICAST_ENABLE;
 
 			if (!dev->mc_count) {
 				lbs_deb_net("no multicast addresses, "
 				       "disabling multicast\n");
-				priv->currentpacketfilter &=
+				priv->mac_control &=
 				    ~CMD_ACT_MAC_MULTICAST_ENABLE;
 			} else {
 				int i;
 
-				priv->currentpacketfilter |=
+				priv->mac_control |=
 				    CMD_ACT_MAC_MULTICAST_ENABLE;
 
 				priv->nr_of_multicastmacaddr =
@@ -642,9 +640,8 @@ static void lbs_set_multicast_list(struct net_device *dev)
 		}
 	}
 
-	if (priv->currentpacketfilter != oldpacketfilter) {
-		lbs_set_mac_packet_filter(priv);
-	}
+	if (priv->mac_control != old_mac_control)
+		lbs_set_mac_control(priv);
 
 	lbs_deb_leave(LBS_DEB_NET);
 }
@@ -662,7 +659,6 @@ static int lbs_thread(void *data)
 	struct net_device *dev = data;
 	struct lbs_private *priv = dev->priv;
 	wait_queue_t wait;
-	u8 ireg = 0;
 
 	lbs_deb_enter(LBS_DEB_THREAD);
 
@@ -670,9 +666,10 @@ static int lbs_thread(void *data)
 
 	for (;;) {
 		int shouldsleep;
+		u8 resp_idx;
 
-		lbs_deb_thread( "main-thread 111: intcounter=%d currenttxskb=%p dnld_sent=%d\n",
-				priv->intcounter, priv->currenttxskb, priv->dnld_sent);
+		lbs_deb_thread("1: currenttxskb %p, dnld_sent %d\n",
+				priv->currenttxskb, priv->dnld_sent);
 
 		add_wait_queue(&priv->waitq, &wait);
 		set_current_state(TASK_INTERRUPTIBLE);
@@ -684,8 +681,6 @@ static int lbs_thread(void *data)
 			shouldsleep = 1;	/* We need to wait until we're _told_ to die */
 		else if (priv->psstate == PS_STATE_SLEEP)
 			shouldsleep = 1;	/* Sleep mode. Nothing we can do till it wakes */
-		else if (priv->intcounter)
-			shouldsleep = 0;	/* Interrupt pending. Deal with it now */
 		else if (priv->cmd_timed_out)
 			shouldsleep = 0;	/* Command timed out. Recover */
 		else if (!priv->fw_ready)
@@ -698,29 +693,34 @@ static int lbs_thread(void *data)
 			shouldsleep = 1;	/* Can't send a command; one already running */
 		else if (!list_empty(&priv->cmdpendingq))
 			shouldsleep = 0;	/* We have a command to send */
+		else if (__kfifo_len(priv->event_fifo))
+			shouldsleep = 0;	/* We have an event to process */
+		else if (priv->resp_len[priv->resp_idx])
+			shouldsleep = 0;	/* We have a command response */
 		else
 			shouldsleep = 1;	/* No command */
 
 		if (shouldsleep) {
-			lbs_deb_thread("main-thread sleeping... Conn=%d IntC=%d PS_mode=%d PS_State=%d\n",
-				       priv->connect_status, priv->intcounter,
-				       priv->psmode, priv->psstate);
+			lbs_deb_thread("sleeping, connect_status %d, "
+				"ps_mode %d, ps_state %d\n",
+				priv->connect_status,
+				priv->psmode, priv->psstate);
 			spin_unlock_irq(&priv->driver_lock);
 			schedule();
 		} else
 			spin_unlock_irq(&priv->driver_lock);
 
-		lbs_deb_thread("main-thread 222 (waking up): intcounter=%d currenttxskb=%p dnld_sent=%d\n",
-			       priv->intcounter, priv->currenttxskb, priv->dnld_sent);
+		lbs_deb_thread("2: currenttxskb %p, dnld_send %d\n",
+			       priv->currenttxskb, priv->dnld_sent);
 
 		set_current_state(TASK_RUNNING);
 		remove_wait_queue(&priv->waitq, &wait);
 
-		lbs_deb_thread("main-thread 333: intcounter=%d currenttxskb=%p dnld_sent=%d\n",
-			       priv->intcounter, priv->currenttxskb, priv->dnld_sent);
+		lbs_deb_thread("3: currenttxskb %p, dnld_sent %d\n",
+			       priv->currenttxskb, priv->dnld_sent);
 
 		if (kthread_should_stop()) {
-			lbs_deb_thread("main-thread: break from main thread\n");
+			lbs_deb_thread("break from main thread\n");
 			break;
 		}
 
@@ -729,35 +729,23 @@ static int lbs_thread(void *data)
 			continue;
 		}
 
-		spin_lock_irq(&priv->driver_lock);
-
-		if (priv->intcounter) {
-			u8 int_status;
-
-			priv->intcounter = 0;
-			int_status = priv->hw_get_int_status(priv, &ireg);
-
-			if (int_status) {
-				lbs_deb_thread("main-thread: reading HOST_INT_STATUS_REG failed\n");
-				spin_unlock_irq(&priv->driver_lock);
-				continue;
-			}
-			priv->hisregcpy |= ireg;
-		}
-
-		lbs_deb_thread("main-thread 444: intcounter=%d currenttxskb=%p dnld_sent=%d\n",
-			       priv->intcounter, priv->currenttxskb, priv->dnld_sent);
+		lbs_deb_thread("4: currenttxskb %p, dnld_sent %d\n",
+		       priv->currenttxskb, priv->dnld_sent);
 
-		/* command response? */
-		if (priv->hisregcpy & MRVDRV_CMD_UPLD_RDY) {
-			lbs_deb_thread("main-thread: cmd response ready\n");
-
-			priv->hisregcpy &= ~MRVDRV_CMD_UPLD_RDY;
+		spin_lock_irq(&priv->driver_lock);
+		/* Process any pending command response */
+		resp_idx = priv->resp_idx;
+		if (priv->resp_len[resp_idx]) {
 			spin_unlock_irq(&priv->driver_lock);
-			lbs_process_rx_command(priv);
+			lbs_process_command_response(priv,
+				priv->resp_buf[resp_idx],
+				priv->resp_len[resp_idx]);
 			spin_lock_irq(&priv->driver_lock);
+			priv->resp_len[resp_idx] = 0;
 		}
+		spin_unlock_irq(&priv->driver_lock);
 
+		/* command timeout stuff */
 		if (priv->cmd_timed_out && priv->cur_cmd) {
 			struct cmd_ctrl_node *cmdnode = priv->cur_cmd;
 
@@ -778,21 +766,18 @@ static int lbs_thread(void *data)
 		}
 		priv->cmd_timed_out = 0;
 
-		/* Any Card Event */
-		if (priv->hisregcpy & MRVDRV_CARDEVENT) {
-			lbs_deb_thread("main-thread: Card Event Activity\n");
-
-			priv->hisregcpy &= ~MRVDRV_CARDEVENT;
+		/* Process hardware events, e.g. card removed, link lost */
+		spin_lock_irq(&priv->driver_lock);
+		while (__kfifo_len(priv->event_fifo)) {
+			u32 event;
 
-			if (priv->hw_read_event_cause(priv)) {
-				lbs_pr_alert("main-thread: hw_read_event_cause failed\n");
-				spin_unlock_irq(&priv->driver_lock);
-				continue;
-			}
-			spin_unlock_irq(&priv->driver_lock);
-			lbs_process_event(priv);
-		} else
+			__kfifo_get(priv->event_fifo, (unsigned char *) &event,
+				sizeof(event));
 			spin_unlock_irq(&priv->driver_lock);
+			lbs_process_event(priv, event);
+			spin_lock_irq(&priv->driver_lock);
+		}
+		spin_unlock_irq(&priv->driver_lock);
 
 		if (!priv->fw_ready)
 			continue;
@@ -801,10 +786,12 @@ static int lbs_thread(void *data)
 		if (priv->psstate == PS_STATE_PRE_SLEEP &&
 		    !priv->dnld_sent && !priv->cur_cmd) {
 			if (priv->connect_status == LBS_CONNECTED) {
-				lbs_deb_thread("main_thread: PRE_SLEEP--intcounter=%d currenttxskb=%p dnld_sent=%d cur_cmd=%p, confirm now\n",
-					       priv->intcounter, priv->currenttxskb, priv->dnld_sent, priv->cur_cmd);
+				lbs_deb_thread("pre-sleep, currenttxskb %p, "
+					"dnld_sent %d, cur_cmd %p\n",
+					priv->currenttxskb, priv->dnld_sent,
+					priv->cur_cmd);
 
-				lbs_ps_confirm_sleep(priv, (u16) priv->psmode);
+				lbs_ps_confirm_sleep(priv);
 			} else {
 				/* workaround for firmware sending
 				 * deauth/linkloss event immediately
@@ -812,7 +799,8 @@ static int lbs_thread(void *data)
 				 * after firmware fixes it
 				 */
 				priv->psstate = PS_STATE_AWAKE;
-				lbs_pr_alert("main-thread: ignore PS_SleepConfirm in non-connected state\n");
+				lbs_pr_alert("ignore PS_SleepConfirm in "
+					"non-connected state\n");
 			}
 		}
 
@@ -945,7 +933,7 @@ static int lbs_setup_firmware(struct lbs_private *priv)
 		goto done;
 	}
 
-	lbs_set_mac_packet_filter(priv);
+	lbs_set_mac_control(priv);
 
 	ret = lbs_get_data_rate(priv);
 	if (ret < 0) {
@@ -985,6 +973,18 @@ out:
 	lbs_deb_leave(LBS_DEB_CMD);
 }
 
+static void lbs_sync_channel_worker(struct work_struct *work)
+{
+	struct lbs_private *priv = container_of(work, struct lbs_private,
+		sync_channel);
+
+	lbs_deb_enter(LBS_DEB_MAIN);
+	if (lbs_update_channel(priv))
+		lbs_pr_info("Channel synchronization failed.");
+	lbs_deb_leave(LBS_DEB_MAIN);
+}
+
+
 static int lbs_init_adapter(struct lbs_private *priv)
 {
 	size_t bufsize;
@@ -1009,14 +1009,6 @@ static int lbs_init_adapter(struct lbs_private *priv)
 			      &priv->network_free_list);
 	}
 
-	priv->lbs_ps_confirm_sleep.seqnum = cpu_to_le16(++priv->seqnum);
-	priv->lbs_ps_confirm_sleep.command =
-	    cpu_to_le16(CMD_802_11_PS_MODE);
-	priv->lbs_ps_confirm_sleep.size =
-	    cpu_to_le16(sizeof(struct PS_CMD_ConfirmSleep));
-	priv->lbs_ps_confirm_sleep.action =
-	    cpu_to_le16(CMD_SUBCMD_SLEEP_CONFIRMED);
-
 	memset(priv->current_addr, 0xff, ETH_ALEN);
 
 	priv->connect_status = LBS_DISCONNECTED;
@@ -1024,7 +1016,7 @@ static int lbs_init_adapter(struct lbs_private *priv)
 	priv->secinfo.auth_mode = IW_AUTH_ALG_OPEN_SYSTEM;
 	priv->mode = IW_MODE_INFRA;
 	priv->curbssparams.channel = DEFAULT_AD_HOC_CHANNEL;
-	priv->currentpacketfilter = CMD_ACT_MAC_RX_ON | CMD_ACT_MAC_TX_ON;
+	priv->mac_control = CMD_ACT_MAC_RX_ON | CMD_ACT_MAC_TX_ON;
 	priv->radioon = RADIO_ON;
 	priv->auto_rate = 1;
 	priv->capability = WLAN_CAPABILITY_SHORT_PREAMBLE;
@@ -1045,7 +1037,18 @@ static int lbs_init_adapter(struct lbs_private *priv)
 	/* Allocate the command buffers */
 	if (lbs_allocate_cmd_buffer(priv)) {
 		lbs_pr_err("Out of memory allocating command buffers\n");
-		ret = -1;
+		ret = -ENOMEM;
+		goto out;
+	}
+	priv->resp_idx = 0;
+	priv->resp_len[0] = priv->resp_len[1] = 0;
+
+	/* Create the event FIFO */
+	priv->event_fifo = kfifo_alloc(sizeof(u32) * 16, GFP_KERNEL, NULL);
+	if (IS_ERR(priv->event_fifo)) {
+		lbs_pr_err("Out of memory allocating event FIFO buffer\n");
+		ret = -ENOMEM;
+		goto out;
 	}
 
 out:
@@ -1059,6 +1062,8 @@ static void lbs_free_adapter(struct lbs_private *priv)
 	lbs_deb_enter(LBS_DEB_MAIN);
 
 	lbs_free_cmd_buffer(priv);
+	if (priv->event_fifo)
+		kfifo_free(priv->event_fifo);
 	del_timer(&priv->command_timer);
 	kfree(priv->networks);
 	priv->networks = NULL;
@@ -1128,7 +1133,7 @@ struct lbs_private *lbs_add_card(void *card, struct device *dmdev)
 	priv->work_thread = create_singlethread_workqueue("lbs_worker");
 	INIT_DELAYED_WORK(&priv->assoc_work, lbs_association_worker);
 	INIT_DELAYED_WORK(&priv->scan_work, lbs_scan_worker);
-	INIT_WORK(&priv->sync_channel, lbs_sync_channel);
+	INIT_WORK(&priv->sync_channel, lbs_sync_channel_worker);
 
 	sprintf(priv->mesh_ssid, "mesh");
 	priv->mesh_ssid_len = 4;
@@ -1380,7 +1385,7 @@ static void lbs_remove_mesh(struct lbs_private *priv)
  *  @param cfp_no  A pointer to CFP number
  *  @return 	   A pointer to CFP
  */
-struct chan_freq_power *lbs_get_region_cfp_table(u8 region, u8 band, int *cfp_no)
+struct chan_freq_power *lbs_get_region_cfp_table(u8 region, int *cfp_no)
 {
 	int i, end;
 
@@ -1414,7 +1419,7 @@ int lbs_set_regiontable(struct lbs_private *priv, u8 region, u8 band)
 
 	memset(priv->region_channel, 0, sizeof(priv->region_channel));
 
-	cfp = lbs_get_region_cfp_table(region, band, &cfp_no);
+	cfp = lbs_get_region_cfp_table(region, &cfp_no);
 	if (cfp != NULL) {
 		priv->region_channel[i].nrcfp = cfp_no;
 		priv->region_channel[i].CFP = cfp;
@@ -1433,31 +1438,49 @@ out:
 	return ret;
 }
 
-/**
- *  @brief This function handles the interrupt. it will change PS
- *  state if applicable. it will wake up main_thread to handle
- *  the interrupt event as well.
- *
- *  @param dev     A pointer to net_device structure
- *  @return 	   n/a
- */
-void lbs_interrupt(struct lbs_private *priv)
+void lbs_queue_event(struct lbs_private *priv, u32 event)
+{
+	unsigned long flags;
+
+	lbs_deb_enter(LBS_DEB_THREAD);
+	spin_lock_irqsave(&priv->driver_lock, flags);
+
+	if (priv->psstate == PS_STATE_SLEEP)
+		priv->psstate = PS_STATE_AWAKE;
+
+	__kfifo_put(priv->event_fifo, (unsigned char *) &event, sizeof(u32));
+
+	wake_up_interruptible(&priv->waitq);
+
+	spin_unlock_irqrestore(&priv->driver_lock, flags);
+	lbs_deb_leave(LBS_DEB_THREAD);
+}
+EXPORT_SYMBOL_GPL(lbs_queue_event);
+
+void lbs_notify_command_response(struct lbs_private *priv, u8 resp_idx)
 {
 	lbs_deb_enter(LBS_DEB_THREAD);
 
-	lbs_deb_thread("lbs_interrupt: intcounter=%d\n", priv->intcounter);
-	priv->intcounter++;
 	if (priv->psstate == PS_STATE_SLEEP)
 		priv->psstate = PS_STATE_AWAKE;
+
+	/* Swap buffers by flipping the response index */
+	BUG_ON(resp_idx > 1);
+	priv->resp_idx = resp_idx;
+
 	wake_up_interruptible(&priv->waitq);
 
 	lbs_deb_leave(LBS_DEB_THREAD);
 }
-EXPORT_SYMBOL_GPL(lbs_interrupt);
+EXPORT_SYMBOL_GPL(lbs_notify_command_response);
 
 static int __init lbs_init_module(void)
 {
 	lbs_deb_enter(LBS_DEB_MAIN);
+	memset(&confirm_sleep, 0, sizeof(confirm_sleep));
+	confirm_sleep.hdr.command = cpu_to_le16(CMD_802_11_PS_MODE);
+	confirm_sleep.hdr.size = cpu_to_le16(sizeof(confirm_sleep));
+	confirm_sleep.action = cpu_to_le16(CMD_SUBCMD_SLEEP_CONFIRMED);
 	lbs_debugfs_init();
 	lbs_deb_leave(LBS_DEB_MAIN);
 	return 0;
@@ -1554,6 +1577,32 @@ out:
 	return ret;
 }
 
+#ifndef CONFIG_IEEE80211
+const char *escape_essid(const char *essid, u8 essid_len)
+{
+	static char escaped[IW_ESSID_MAX_SIZE * 2 + 1];
+	const char *s = essid;
+	char *d = escaped;
+
+	if (ieee80211_is_empty_essid(essid, essid_len)) {
+		memcpy(escaped, "<hidden>", sizeof("<hidden>"));
+		return escaped;
+	}
+
+	essid_len = min(essid_len, (u8) IW_ESSID_MAX_SIZE);
+	while (essid_len--) {
+		if (*s == '\0') {
+			*d++ = '\\';
+			*d++ = '0';
+			s++;
+		} else {
+			*d++ = *s++;
+		}
+	}
+	*d = '\0';
+	return escaped;
+}
+#endif
 
 module_init(lbs_init_module);
 module_exit(lbs_exit_module);