mwifiex: remove cfg_workqueue

cfg_workqueue was added to notify cfg80211 that scan, connect
or disconnect is done by calling respective completion handlers.
We can avoid use of this workqueue by calling those handlers
from other places.
1) Call connect, disconnect completion handlers in their callback
   functions.
   ex. Call cfg80211_connect_result() in mwifiex_cfg80211_connect()
2) Call scan completion handler after parsing response of last scan
   command in a queue.

After removing the workqueue, variables (assoc_request etc.) and
checks used for mutual exclusion become redundant. Those are also
removed in this patch.

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Yogesh Ashok Powar <yogeshp@marvell.com>
Signed-off-by: Nishant Sarmukadam <nishants@marvell.com>
Signed-off-by: Kiran Divekar <dkiran@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 57 insertions, 134 deletions

diff --git a/drivers/net/wireless/mwifiex/cfg80211.c b/drivers/net/wireless/mwifiex/cfg80211.c
index ffd293e2b87f..787dbe2aa408 100644
--- a/drivers/net/wireless/mwifiex/cfg80211.c
+++ b/drivers/net/wireless/mwifiex/cfg80211.c
@@ -751,17 +751,13 @@ mwifiex_cfg80211_disconnect(struct wiphy *wiphy, struct net_device *dev,
 {
 	struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 
-	if (priv->disconnect)
-		return -EBUSY;
-
-	priv->disconnect = 1;
 	if (mwifiex_deauthenticate(priv, NULL))
 		return -EFAULT;
 
 	wiphy_dbg(wiphy, "info: successfully disconnected from %pM:"
 		" reason code %d\n", priv->cfg_bssid, reason_code);
 
-	queue_work(priv->workqueue, &priv->cfg_workqueue);
+	memset(priv->cfg_bssid, 0, ETH_ALEN);
 
 	return 0;
 }
@@ -981,27 +977,32 @@ mwifiex_cfg80211_connect(struct wiphy *wiphy, struct net_device *dev,
 	struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 	int ret = 0;
 
-	if (priv->assoc_request)
-		return -EBUSY;
-
 	if (priv->bss_mode == NL80211_IFTYPE_ADHOC) {
 		wiphy_err(wiphy, "received infra assoc request "
 				"when station is in ibss mode\n");
 		goto done;
 	}
 
-	priv->assoc_request = -EINPROGRESS;
-
 	wiphy_dbg(wiphy, "info: Trying to associate to %s and bssid %pM\n",
 	       (char *) sme->ssid, sme->bssid);
 
 	ret = mwifiex_cfg80211_assoc(priv, sme->ssid_len, sme->ssid, sme->bssid,
 				     priv->bss_mode, sme->channel, sme, 0);
-
-	priv->assoc_request = 1;
 done:
-	priv->assoc_result = ret;
-	queue_work(priv->workqueue, &priv->cfg_workqueue);
+	if (!ret) {
+		cfg80211_connect_result(priv->netdev, priv->cfg_bssid, NULL, 0,
+					NULL, 0, WLAN_STATUS_SUCCESS,
+					GFP_KERNEL);
+		dev_dbg(priv->adapter->dev,
+			"info: associated to bssid %pM successfully\n",
+			priv->cfg_bssid);
+	} else {
+		dev_dbg(priv->adapter->dev,
+			"info: association to bssid %pM failed\n",
+			priv->cfg_bssid);
+		memset(priv->cfg_bssid, 0, ETH_ALEN);
+	}
+
 	return ret;
 }
 
@@ -1018,28 +1019,29 @@ mwifiex_cfg80211_join_ibss(struct wiphy *wiphy, struct net_device *dev,
 	struct mwifiex_private *priv = mwifiex_cfg80211_get_priv(wiphy);
 	int ret = 0;
 
-	if (priv->ibss_join_request)
-		return -EBUSY;
-
 	if (priv->bss_mode != NL80211_IFTYPE_ADHOC) {
 		wiphy_err(wiphy, "request to join ibss received "
 				"when station is not in ibss mode\n");
 		goto done;
 	}
 
-	priv->ibss_join_request = -EINPROGRESS;
-
 	wiphy_dbg(wiphy, "info: trying to join to %s and bssid %pM\n",
 	       (char *) params->ssid, params->bssid);
 
 	ret = mwifiex_cfg80211_assoc(priv, params->ssid_len, params->ssid,
 				params->bssid, priv->bss_mode,
 				params->channel, NULL, params->privacy);
-
-	priv->ibss_join_request = 1;
 done:
-	priv->ibss_join_result = ret;
-	queue_work(priv->workqueue, &priv->cfg_workqueue);
+	if (!ret) {
+		cfg80211_ibss_joined(priv->netdev, priv->cfg_bssid, GFP_KERNEL);
+		dev_dbg(priv->adapter->dev,
+			"info: joined/created adhoc network with bssid"
+			" %pM successfully\n", priv->cfg_bssid);
+	} else {
+		dev_dbg(priv->adapter->dev,
+			"info: failed creating/joining adhoc network\n");
+	}
+
 	return ret;
 }
 
@@ -1054,17 +1056,12 @@ mwifiex_cfg80211_leave_ibss(struct wiphy *wiphy, struct net_device *dev)
 {
 	struct mwifiex_private *priv = mwifiex_cfg80211_get_priv(wiphy);
 
-	if (priv->disconnect)
-		return -EBUSY;
-
-	priv->disconnect = 1;
-
 	wiphy_dbg(wiphy, "info: disconnecting from essid %pM\n",
 			priv->cfg_bssid);
 	if (mwifiex_deauthenticate(priv, NULL))
 		return -EFAULT;
 
-	queue_work(priv->workqueue, &priv->cfg_workqueue);
+	memset(priv->cfg_bssid, 0, ETH_ALEN);
 
 	return 0;
 }
@@ -1081,15 +1078,42 @@ mwifiex_cfg80211_scan(struct wiphy *wiphy, struct net_device *dev,
 		      struct cfg80211_scan_request *request)
 {
 	struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
+	int i;
+	struct ieee80211_channel *chan;
 
 	wiphy_dbg(wiphy, "info: received scan request on %s\n", dev->name);
 
-	if (priv->scan_request && priv->scan_request != request)
-		return -EBUSY;
-
 	priv->scan_request = request;
 
-	queue_work(priv->workqueue, &priv->cfg_workqueue);
+	priv->user_scan_cfg = kzalloc(sizeof(struct mwifiex_user_scan_cfg),
+					GFP_KERNEL);
+	if (!priv->user_scan_cfg) {
+		dev_err(priv->adapter->dev, "failed to alloc scan_req\n");
+		return -ENOMEM;
+	}
+	for (i = 0; i < request->n_ssids; i++) {
+		memcpy(priv->user_scan_cfg->ssid_list[i].ssid,
+			request->ssids[i].ssid, request->ssids[i].ssid_len);
+		priv->user_scan_cfg->ssid_list[i].max_len =
+			request->ssids[i].ssid_len;
+	}
+	for (i = 0; i < request->n_channels; i++) {
+		chan = request->channels[i];
+		priv->user_scan_cfg->chan_list[i].chan_number = chan->hw_value;
+		priv->user_scan_cfg->chan_list[i].radio_type = chan->band;
+
+		if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN)
+			priv->user_scan_cfg->chan_list[i].scan_type =
+				MWIFIEX_SCAN_TYPE_PASSIVE;
+		else
+			priv->user_scan_cfg->chan_list[i].scan_type =
+				MWIFIEX_SCAN_TYPE_ACTIVE;
+
+		priv->user_scan_cfg->chan_list[i].scan_time = 0;
+	}
+	if (mwifiex_set_user_scan_ioctl(priv, priv->user_scan_cfg))
+		return -EFAULT;
+
 	return 0;
 }
 
@@ -1295,10 +1319,6 @@ int mwifiex_del_virtual_intf(struct wiphy *wiphy, struct net_device *dev)
 
 	priv->media_connected = false;
 
-	cancel_work_sync(&priv->cfg_workqueue);
-	flush_workqueue(priv->workqueue);
-	destroy_workqueue(priv->workqueue);
-
 	priv->bss_mode = NL80211_IFTYPE_UNSPECIFIED;
 
 	return 0;
@@ -1404,100 +1424,3 @@ int mwifiex_register_cfg80211(struct mwifiex_private *priv)
 
 	return ret;
 }
-
-/*
- * This function handles the result of different pending network operations.
- *
- * The following operations are handled and CFG802.11 subsystem is
- * notified accordingly -
- *      - Scan request completion
- *      - Association request completion
- *      - IBSS join request completion
- *      - Disconnect request completion
- */
-void
-mwifiex_cfg80211_results(struct work_struct *work)
-{
-	struct mwifiex_private *priv =
-		container_of(work, struct mwifiex_private, cfg_workqueue);
-	struct mwifiex_user_scan_cfg *scan_req;
-	int ret = 0, i;
-	struct ieee80211_channel *chan;
-
-	if (priv->scan_request) {
-		scan_req = kzalloc(sizeof(struct mwifiex_user_scan_cfg),
-				   GFP_KERNEL);
-		if (!scan_req) {
-			dev_err(priv->adapter->dev, "failed to alloc "
-						    "scan_req\n");
-			return;
-		}
-		for (i = 0; i < priv->scan_request->n_ssids; i++) {
-			memcpy(scan_req->ssid_list[i].ssid,
-					priv->scan_request->ssids[i].ssid,
-					priv->scan_request->ssids[i].ssid_len);
-			scan_req->ssid_list[i].max_len =
-					priv->scan_request->ssids[i].ssid_len;
-		}
-		for (i = 0; i < priv->scan_request->n_channels; i++) {
-			chan = priv->scan_request->channels[i];
-			scan_req->chan_list[i].chan_number = chan->hw_value;
-			scan_req->chan_list[i].radio_type = chan->band;
-			if (chan->flags & IEEE80211_CHAN_DISABLED)
-				scan_req->chan_list[i].scan_type =
-					MWIFIEX_SCAN_TYPE_PASSIVE;
-			else
-				scan_req->chan_list[i].scan_type =
-					MWIFIEX_SCAN_TYPE_ACTIVE;
-			scan_req->chan_list[i].scan_time = 0;
-		}
-		if (mwifiex_set_user_scan_ioctl(priv, scan_req))
-			ret = -EFAULT;
-		priv->scan_result_status = ret;
-		dev_dbg(priv->adapter->dev, "info: %s: sending scan results\n",
-							__func__);
-		cfg80211_scan_done(priv->scan_request,
-				(priv->scan_result_status < 0));
-		priv->scan_request = NULL;
-		kfree(scan_req);
-	}
-
-	if (priv->assoc_request == 1) {
-		if (!priv->assoc_result) {
-			cfg80211_connect_result(priv->netdev, priv->cfg_bssid,
-						NULL, 0, NULL, 0,
-						WLAN_STATUS_SUCCESS,
-						GFP_KERNEL);
-			dev_dbg(priv->adapter->dev,
-				"info: associated to bssid %pM successfully\n",
-			       priv->cfg_bssid);
-		} else {
-			dev_dbg(priv->adapter->dev,
-				"info: association to bssid %pM failed\n",
-			       priv->cfg_bssid);
-			memset(priv->cfg_bssid, 0, ETH_ALEN);
-		}
-		priv->assoc_request = 0;
-		priv->assoc_result = 0;
-	}
-
-	if (priv->ibss_join_request == 1) {
-		if (!priv->ibss_join_result) {
-			cfg80211_ibss_joined(priv->netdev, priv->cfg_bssid,
-					     GFP_KERNEL);
-			dev_dbg(priv->adapter->dev,
-				"info: joined/created adhoc network with bssid"
-					" %pM successfully\n", priv->cfg_bssid);
-		} else {
-			dev_dbg(priv->adapter->dev,
-				"info: failed creating/joining adhoc network\n");
-		}
-		priv->ibss_join_request = 0;
-		priv->ibss_join_result = 0;
-	}
-
-	if (priv->disconnect) {
-		memset(priv->cfg_bssid, 0, ETH_ALEN);
-		priv->disconnect = 0;
-	}
-}