staging: wilc1000: store bss object and use cfg80211_connect_bss()

In a fast disconnect/connect sequence, cfg80211_connect_result() can
fail to find the bss object which the driver is connecting to. Detailed
sequence of events:
* Driver is connected in STA mode
* Disconnect request arrives from user space. Driver disconnects and
  calls cfg80211_disconnected() which adds new event to the
  cfg80211_wq worker thread
* Connect request arrives from user space. cfg80211_connect() stores
  ssid/ssid_len and calls rdev_connect()
* __cfg80211_disconnected() runs in worker thread and zero
  wdev->ssid_len
* Connect succeeds. Driver calls cfg80211_connect_result() which fails
  to find the bss because wdev->ssid_len is zero

To overcome this, upon connect request, store the bss object in the
driver and upon connect completion pass it to kernel using
cfg80211_connect_bss().

Ref: bcdd49b0 ("store bss object and use cfg80211_connect_bss()")
Signed-off-by: Adham Abozaeid <adham.abozaeid@microchip.com>
Link: https://lore.kernel.org/r/20191017165105.27429-1-adham.abozaeid@microchip.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/wilc_wfi_cfgoperations.c

@@ -137,6 +137,7 @@ static void cfg_connect_result(enum conn_event conn_disconn_evt, u8 mac_status,
 	struct wilc *wl = vif->wilc;
 	struct host_if_drv *wfi_drv = priv->hif_drv;
 	struct wilc_conn_info *conn_info = &wfi_drv->conn_info;
+	struct wiphy *wiphy = dev->ieee80211_ptr->wiphy;
 
 	vif->connecting = false;
 
@@ -158,12 +159,16 @@ static void cfg_connect_result(enum conn_event conn_disconn_evt, u8 mac_status,
 			memcpy(priv->associated_bss, conn_info->bssid,
 			       ETH_ALEN);
 
-		cfg80211_connect_result(dev, conn_info->bssid,
-					conn_info->req_ies,
-					conn_info->req_ies_len,
-					conn_info->resp_ies,
-					conn_info->resp_ies_len, connect_status,
-					GFP_KERNEL);
+		cfg80211_ref_bss(wiphy, vif->bss);
+		cfg80211_connect_bss(dev, conn_info->bssid, vif->bss,
+				     conn_info->req_ies,
+				     conn_info->req_ies_len,
+				     conn_info->resp_ies,
+				     conn_info->resp_ies_len,
+				     connect_status, GFP_KERNEL,
+				     NL80211_TIMEOUT_UNSPECIFIED);
+
+		vif->bss = NULL;
 	} else if (conn_disconn_evt == CONN_DISCONN_EVENT_DISCONN_NOTIF) {
 		u16 reason = 0;
 
@@ -406,6 +411,7 @@ static int connect(struct wiphy *wiphy, struct net_device *dev,
 		goto out_put_bss;
 	}
 	kfree(join_params);
+	vif->bss = bss;
 	cfg80211_put_bss(wiphy, bss);
 	return 0;
 
@@ -451,6 +457,8 @@ static int disconnect(struct wiphy *wiphy, struct net_device *dev,
 		ret = -EINVAL;
 	}
 
+	vif->bss = NULL;
+
 	return ret;
 }
 

drivers/staging/wilc1000/wilc_wfi_netdevice.h

@@ -209,6 +209,7 @@ struct wilc_vif {
 	bool connecting;
 	struct wilc_priv priv;
 	struct list_head list;
+	struct cfg80211_bss *bss;
 };
 
 struct wilc {