[PATCH] libertas: move channel changing into association framework

Handle channel changes through the deferred association framework
rather than directly.  Fixes errors when setting channels along
with other parameters like mode and SSID.
Signed-off-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/libertas/assoc.c

@@ -22,6 +22,10 @@ static int assoc_helper_essid(wlan_private *priv,
 
 	lbs_deb_enter(LBS_DEB_ASSOC);
 
+	/* FIXME: take channel into account when picking SSIDs if a channel
+	 * is set.
+	 */
+
 	lbs_deb_assoc("New SSID requested: %s\n", assoc_req->ssid.ssid);
 	if (assoc_req->mode == IW_MODE_INFRA) {
 		if (adapter->prescan) {
@@ -158,6 +162,69 @@ static int assoc_helper_mode(wlan_private *priv,
 }
 
 
+static int update_channel(wlan_private * priv)
+{
+	/* the channel in f/w could be out of sync, get the current channel */
+	return libertas_prepare_and_send_command(priv, cmd_802_11_rf_channel,
+				    cmd_opt_802_11_rf_channel_get,
+				    cmd_option_waitforrsp, 0, NULL);
+}
+
+static int assoc_helper_channel(wlan_private *priv,
+                                struct assoc_request * assoc_req)
+{
+	wlan_adapter *adapter = priv->adapter;
+	int ret = 0;
+
+	lbs_deb_enter(LBS_DEB_ASSOC);
+
+	ret = update_channel(priv);
+	if (ret < 0) {
+		lbs_deb_assoc("ASSOC: channel: error getting channel.");
+	}
+
+	if (assoc_req->channel == adapter->curbssparams.channel)
+		goto done;
+
+	lbs_deb_assoc("ASSOC: channel: %d -> %d\n",
+	       adapter->curbssparams.channel, assoc_req->channel);
+
+	ret = libertas_prepare_and_send_command(priv, cmd_802_11_rf_channel,
+				cmd_opt_802_11_rf_channel_set,
+				cmd_option_waitforrsp, 0, &assoc_req->channel);
+	if (ret < 0) {
+		lbs_deb_assoc("ASSOC: channel: error setting channel.");
+	}
+
+	ret = update_channel(priv);
+	if (ret < 0) {
+		lbs_deb_assoc("ASSOC: channel: error getting channel.");
+	}
+
+	if (assoc_req->channel != adapter->curbssparams.channel) {
+		lbs_deb_assoc("ASSOC: channel: failed to update channel to %d",
+		              assoc_req->channel);
+		goto done;
+	}
+
+	if (   assoc_req->secinfo.wep_enabled
+	    &&   (assoc_req->wep_keys[0].len
+	       || assoc_req->wep_keys[1].len
+	       || assoc_req->wep_keys[2].len
+	       || assoc_req->wep_keys[3].len)) {
+		/* Make sure WEP keys are re-sent to firmware */
+		set_bit(ASSOC_FLAG_WEP_KEYS, &assoc_req->flags);
+	}
+
+	/* Must restart/rejoin adhoc networks after channel change */
+	set_bit(ASSOC_FLAG_SSID, &assoc_req->flags);
+
+done:
+	lbs_deb_leave_args(LBS_DEB_ASSOC, "ret %d", ret);
+	return ret;
+}
+
+
 static int assoc_helper_wep_keys(wlan_private *priv,
                                  struct assoc_request * assoc_req)
 {
@@ -334,6 +401,11 @@ static int should_stop_adhoc(wlan_adapter *adapter,
 			return 1;
 	}
 
+	if (test_bit(ASSOC_FLAG_CHANNEL, &assoc_req->flags)) {
+		if (assoc_req->channel != adapter->curbssparams.channel)
+			return 1;
+	}
+
 	return 0;
 }
 
@@ -423,6 +495,15 @@ lbs_deb_assoc("ASSOC(:%d) mode: ret = %d\n", __LINE__, ret);
 		}
 	}
 
+	if (test_bit(ASSOC_FLAG_CHANNEL, &assoc_req->flags)) {
+		ret = assoc_helper_channel(priv, assoc_req);
+		if (ret) {
+			lbs_deb_assoc("ASSOC(:%d) channel: ret = %d\n",
+			              __LINE__, ret);
+			goto out;
+		}
+	}
+
 	if (   test_bit(ASSOC_FLAG_WEP_KEYS, &assoc_req->flags)
 	    || test_bit(ASSOC_FLAG_WEP_TX_KEYIDX, &assoc_req->flags)) {
 		ret = assoc_helper_wep_keys(priv, assoc_req);

drivers/net/wireless/libertas/dev.h

@@ -287,7 +287,6 @@ struct _wlan_adapter {
 	u32 txantenna;
 	u32 rxantenna;
 
-	u8 adhocchannel;
 	u32 fragthsd;
 	u32 rtsthsd;
 

drivers/net/wireless/libertas/fw.c

@@ -220,8 +220,6 @@ static void wlan_init_adapter(wlan_private * priv)
 	memset(&adapter->capinfo, 0, sizeof(adapter->capinfo));
 	adapter->capinfo.shortpreamble = SHORT_PREAMBLE_ALLOWED;
 
-	adapter->adhocchannel = DEFAULT_AD_HOC_CHANNEL;
-
 	adapter->psmode = wlan802_11powermodecam;
 	adapter->multipledtim = MRVDRV_DEFAULT_MULTIPLE_DTIM;
 

drivers/net/wireless/libertas/join.c

@@ -158,7 +158,6 @@ int libertas_start_adhoc_network(wlan_private * priv, struct WLAN_802_11_SSID *a
 
 	libertas_set_radio_control(priv);
 
-	lbs_deb_join("Adhoc channel = %d\n", adapter->adhocchannel);
 	lbs_deb_join("curbssparams.channel = %d\n",
 	       adapter->curbssparams.channel);
 	lbs_deb_join("curbssparams.band = %d\n", adapter->curbssparams.band);
@@ -513,15 +512,13 @@ int libertas_cmd_80211_ad_hoc_start(wlan_private * priv,
 	adhs->phyparamset.dsparamset.elementid = DS_PARA_IE_ID;
 	adhs->phyparamset.dsparamset.len = DS_PARA_IE_LEN;
 
-	WARN_ON(!adapter->adhocchannel);
+	WARN_ON(!adapter->curbssparams.channel);
 
 	lbs_deb_join("ADHOC_S_CMD: Creating ADHOC on channel %d\n",
-	       adapter->adhocchannel);
-
-	adapter->curbssparams.channel = adapter->adhocchannel;
+	       adapter->curbssparams.channel);
 
-	pbssdesc->channel = adapter->adhocchannel;
-	adhs->phyparamset.dsparamset.currentchan = adapter->adhocchannel;
+	pbssdesc->channel = adapter->curbssparams.channel;
+	adhs->phyparamset.dsparamset.currentchan = adapter->curbssparams.channel;
 
 	memcpy(&pbssdesc->phyparamset,
 	       &adhs->phyparamset, sizeof(union ieeetypes_phyparamset));
@@ -909,7 +906,7 @@ int libertas_ret_80211_ad_hoc_start(wlan_private * priv,
 	wireless_send_event(priv->dev, SIOCGIWAP, &wrqu, NULL);
 
 	lbs_deb_join("ADHOC_RESP: - Joined/Started Ad Hoc\n");
-	lbs_deb_join("ADHOC_RESP: channel = %d\n", adapter->adhocchannel);
+	lbs_deb_join("ADHOC_RESP: channel = %d\n", adapter->curbssparams.channel);
 	lbs_deb_join("ADHOC_RESP: BSSID = %02x:%02x:%02x:%02x:%02x:%02x\n",
 	       padhocresult->BSSID[0], padhocresult->BSSID[1],
 	       padhocresult->BSSID[2], padhocresult->BSSID[3],

drivers/net/wireless/libertas/wext.c

@@ -157,103 +157,6 @@ static struct chan_freq_power *find_cfp_by_band_and_freq(wlan_adapter * adapter,
 	return cfp;
 }
 
-static int updatecurrentchannel(wlan_private * priv)
-{
-	int ret;
-
-	/*
-	 ** the channel in f/w could be out of sync, get the current channel
-	 */
-	ret = libertas_prepare_and_send_command(priv, cmd_802_11_rf_channel,
-				    cmd_opt_802_11_rf_channel_get,
-				    cmd_option_waitforrsp, 0, NULL);
-
-	lbs_deb_wext("current channel %d\n",
-	       priv->adapter->curbssparams.channel);
-
-	return ret;
-}
-
-static int setcurrentchannel(wlan_private * priv, int channel)
-{
-	lbs_deb_wext("set channel %d\n", channel);
-
-	/*
-	 **  Current channel is not set to adhocchannel requested, set channel
-	 */
-	return (libertas_prepare_and_send_command(priv, cmd_802_11_rf_channel,
-				      cmd_opt_802_11_rf_channel_set,
-				      cmd_option_waitforrsp, 0, &channel));
-}
-
-static int changeadhocchannel(wlan_private * priv, int channel)
-{
-	int ret = 0;
-	struct WLAN_802_11_SSID curadhocssid;
-	struct bss_descriptor * join_bss = NULL;
-	wlan_adapter *adapter = priv->adapter;
-
-	adapter->adhocchannel = channel;
-
-	updatecurrentchannel(priv);
-
-	if (adapter->curbssparams.channel == adapter->adhocchannel) {
-		/* adhocchannel is set to the current channel already */
-		goto out;
-	}
-
-	lbs_deb_wext("updating channel from %d to %d\n",
-	       adapter->curbssparams.channel, adapter->adhocchannel);
-
-	setcurrentchannel(priv, adapter->adhocchannel);
-
-	updatecurrentchannel(priv);
-
-	if (adapter->curbssparams.channel != adapter->adhocchannel) {
-		lbs_deb_wext("failed to updated channel to %d, channel = %d\n",
-		       adapter->adhocchannel, adapter->curbssparams.channel);
-		ret = -1;
-		goto out;
-	}
-
-	if (adapter->connect_status != libertas_connected)
-		goto out;
-
-	lbs_deb_wext("channel changed while in IBSS\n");
-
-	/* Copy the current ssid */
-	memcpy(&curadhocssid, &adapter->curbssparams.ssid,
-	       sizeof(struct WLAN_802_11_SSID));
-
-	/* Exit Adhoc mode */
-	lbs_deb_wext("in changeadhocchannel(): sending Adhoc stop\n");
-	ret = libertas_stop_adhoc_network(priv);
-	if (ret)
-		goto out;
-
-	/* Scan for the network, do not save previous results.  Stale
-	 *   scan data will cause us to join a non-existant adhoc network
-	 */
-	libertas_send_specific_SSID_scan(priv, &curadhocssid, 1);
-
-	/* find out the BSSID that matches the current SSID */
-	join_bss = libertas_find_SSID_in_list(adapter, &curadhocssid, NULL,
-			   IW_MODE_ADHOC);
-
-	if (join_bss) {
-		lbs_deb_wext("SSID found in list, so join\n");
-		libertas_join_adhoc_network(priv, join_bss);
-	} else {
-		lbs_deb_wext("SSID not found in list, "
-		       "creating AdHoc with SSID '%s'\n",
-		       curadhocssid.ssid);
-		libertas_start_adhoc_network(priv, &curadhocssid);
-	}
-
-out:
-	lbs_deb_leave_args(LBS_DEB_WEXT, "ret %d", ret);
-	return ret;
-}
 
 /**
  *  @brief Set Radio On/OFF
@@ -1228,82 +1131,59 @@ static struct iw_statistics *wlan_get_wireless_stats(struct net_device *dev)
 static int wlan_set_freq(struct net_device *dev, struct iw_request_info *info,
 		  struct iw_freq *fwrq, char *extra)
 {
-	int ret = 0;
+	int ret = -EINVAL;
 	wlan_private *priv = dev->priv;
 	wlan_adapter *adapter = priv->adapter;
-	int rc = -EINPROGRESS;	/* Call commit handler */
 	struct chan_freq_power *cfp;
+	struct assoc_request * assoc_req;
 
 	lbs_deb_enter(LBS_DEB_WEXT);
 
-	/*
-	 * If setting by frequency, convert to a channel
-	 */
-	if (fwrq->e == 1) {
+	mutex_lock(&adapter->lock);
+	assoc_req = wlan_get_association_request(adapter);
+	if (!assoc_req) {
+		ret = -ENOMEM;
+		goto out;
+	}
 
+	/* If setting by frequency, convert to a channel */
+	if (fwrq->e == 1) {
 		long f = fwrq->m / 100000;
-		int c = 0;
 
 		cfp = find_cfp_by_band_and_freq(adapter, 0, f);
 		if (!cfp) {
 			lbs_deb_wext("invalid freq %ld\n", f);
-			return -EINVAL;
+			goto out;
 		}
 
-		c = (int)cfp->channel;
-
-		if (c < 0)
-			return -EINVAL;
-
 		fwrq->e = 0;
-		fwrq->m = c;
+		fwrq->m = (int) cfp->channel;
 	}
 
-	/*
-	 * Setting by channel number
-	 */
+	/* Setting by channel number */
 	if (fwrq->m > 1000 || fwrq->e > 0) {
-		rc = -EOPNOTSUPP;
-	} else {
-		int channel = fwrq->m;
+		goto out;
+	}
 
-		cfp = libertas_find_cfp_by_band_and_channel(adapter, 0, channel);
-		if (!cfp) {
-			rc = -EINVAL;
-		} else {
-			if (adapter->mode == IW_MODE_ADHOC) {
-				rc = changeadhocchannel(priv, channel);
-				/*  If station is WEP enabled, send the
-				 *  command to set WEP in firmware
-				 */
-				if (adapter->secinfo.wep_enabled) {
-					lbs_deb_wext("set_freq: WEP enabled\n");
-					ret = libertas_prepare_and_send_command(priv,
-								    cmd_802_11_set_wep,
-								    cmd_act_add,
-								    cmd_option_waitforrsp,
-								    0,
-								    NULL);
-
-					if (ret) {
-						rc = ret;
-						goto out;
-					}
-
-					adapter->currentpacketfilter |=
-					    cmd_act_mac_wep_enable;
-
-					libertas_set_mac_packet_filter(priv);
-				}
-			} else {
-				rc = -EOPNOTSUPP;
-			}
-		}
+	cfp = libertas_find_cfp_by_band_and_channel(adapter, 0, fwrq->m);
+	if (!cfp) {
+		goto out;
 	}
 
+	assoc_req->channel = fwrq->m;
+	ret = 0;
+
 out:
-	lbs_deb_leave_args(LBS_DEB_WEXT, "ret %d", rc);
-	return rc;
+	if (ret == 0) {
+		set_bit(ASSOC_FLAG_CHANNEL, &assoc_req->flags);
+		wlan_postpone_association_work(priv);
+	} else {
+		wlan_cancel_association_work(priv);
+	}
+	mutex_unlock(&adapter->lock);
+
+	lbs_deb_leave_args(LBS_DEB_WEXT, "ret %d", ret);
+	return ret;
 }
 
 /**