iwmc3200wifi: add disconnect work

When the driver receives "connection terminated" event from device,
it could be caused by 2 reasons: the firmware is roaming or the
connection is lost (AP disappears). For the former, an association
complete event is supposed to come within 3 seconds. For the latter,
the driver won't receive any event except the connection terminated.
So we kick a delayed work (5*HZ) when we receive the connection
terminated event. It will be canceled if it turns out to be a roaming
event later. Otherwise we notify SME and userspace the disconnection.

Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwmc3200wifi/iwm.h

@@ -273,6 +273,7 @@ struct iwm_priv {
 
 	struct iw_statistics wstats;
 	struct delayed_work stats_request;
+	struct delayed_work disconnect;
 
 	struct iwm_debugfs dbg;
 

drivers/net/wireless/iwmc3200wifi/main.c

@@ -108,6 +108,26 @@ static void iwm_statistics_request(struct work_struct *work)
 	iwm_send_umac_stats_req(iwm, 0);
 }
 
+static void iwm_disconnect_work(struct work_struct *work)
+{
+	struct iwm_priv *iwm =
+		container_of(work, struct iwm_priv, disconnect.work);
+
+	if (iwm->umac_profile_active)
+		iwm_invalidate_mlme_profile(iwm);
+
+	clear_bit(IWM_STATUS_ASSOCIATED, &iwm->status);
+	iwm->umac_profile_active = 0;
+	memset(iwm->bssid, 0, ETH_ALEN);
+	iwm->channel = 0;
+
+	iwm_link_off(iwm);
+
+	wake_up_interruptible(&iwm->mlme_queue);
+
+	cfg80211_disconnected(iwm_to_ndev(iwm), 0, NULL, 0, GFP_KERNEL);
+}
+
 int __iwm_up(struct iwm_priv *iwm);
 int __iwm_down(struct iwm_priv *iwm);
 
@@ -198,6 +218,7 @@ int iwm_priv_init(struct iwm_priv *iwm)
 	spin_lock_init(&iwm->cmd_lock);
 	iwm->scan_id = 1;
 	INIT_DELAYED_WORK(&iwm->stats_request, iwm_statistics_request);
+	INIT_DELAYED_WORK(&iwm->disconnect, iwm_disconnect_work);
 	INIT_WORK(&iwm->reset_worker, iwm_reset_worker);
 	INIT_LIST_HEAD(&iwm->bss_list);
 

drivers/net/wireless/iwmc3200wifi/rx.c

@@ -514,6 +514,7 @@ static int iwm_mlme_assoc_complete(struct iwm_priv *iwm, u8 *buf,
 		/* Internal roaming state, avoid notifying SME. */
 		if (!test_and_clear_bit(IWM_STATUS_SME_CONNECTING, &iwm->status)
 		    && iwm->conf.mode == UMAC_MODE_BSS) {
+			cancel_delayed_work(&iwm->disconnect);
 			cfg80211_roamed(iwm_to_ndev(iwm),
 					complete->bssid,
 					iwm->req_ie, iwm->req_ie_len,
@@ -540,8 +541,10 @@ static int iwm_mlme_assoc_complete(struct iwm_priv *iwm, u8 *buf,
 
 		/* Internal roaming state, avoid notifying SME. */
 		if (!test_and_clear_bit(IWM_STATUS_SME_CONNECTING, &iwm->status)
-		    && iwm->conf.mode == UMAC_MODE_BSS)
+		    && iwm->conf.mode == UMAC_MODE_BSS) {
+			cancel_delayed_work(&iwm->disconnect);
 			break;
+		}
 
 		iwm_link_off(iwm);
 
@@ -569,11 +572,18 @@ static int iwm_mlme_profile_invalidate(struct iwm_priv *iwm, u8 *buf,
 				       struct iwm_wifi_cmd *cmd)
 {
 	struct iwm_umac_notif_profile_invalidate *invalid;
+	u32 reason;
 
 	invalid = (struct iwm_umac_notif_profile_invalidate *)buf;
+	reason = le32_to_cpu(invalid->reason);
+
+	IWM_DBG_MLME(iwm, INFO, "Profile Invalidated. Reason: %d\n", reason);
 
-	IWM_DBG_MLME(iwm, INFO, "Profile Invalidated. Reason: %d\n",
-		     le32_to_cpu(invalid->reason));
+	if (reason != UMAC_PROFILE_INVALID_REQUEST &&
+	    test_bit(IWM_STATUS_SME_CONNECTING, &iwm->status))
+		cfg80211_connect_result(iwm_to_ndev(iwm), NULL, NULL, 0, NULL,
+					0, WLAN_STATUS_UNSPECIFIED_FAILURE,
+					GFP_KERNEL);
 
 	clear_bit(IWM_STATUS_SME_CONNECTING, &iwm->status);
 	clear_bit(IWM_STATUS_ASSOCIATED, &iwm->status);
@@ -589,6 +599,19 @@ static int iwm_mlme_profile_invalidate(struct iwm_priv *iwm, u8 *buf,
 	return 0;
 }
 
+#define IWM_DISCONNECT_INTERVAL	(5 * HZ)
+
+static int iwm_mlme_connection_terminated(struct iwm_priv *iwm, u8 *buf,
+					  unsigned long buf_size,
+					  struct iwm_wifi_cmd *cmd)
+{
+	IWM_DBG_MLME(iwm, DBG, "Connection terminated\n");
+
+	schedule_delayed_work(&iwm->disconnect, IWM_DISCONNECT_INTERVAL);
+
+	return 0;
+}
+
 static int iwm_mlme_scan_complete(struct iwm_priv *iwm, u8 *buf,
 				  unsigned long buf_size,
 				  struct iwm_wifi_cmd *cmd)
@@ -848,8 +871,7 @@ static int iwm_ntf_mlme(struct iwm_priv *iwm, u8 *buf,
 	case WIFI_IF_NTFY_PROFILE_INVALIDATE_COMPLETE:
 		return iwm_mlme_profile_invalidate(iwm, buf, buf_size, cmd);
 	case WIFI_IF_NTFY_CONNECTION_TERMINATED:
-		IWM_DBG_MLME(iwm, DBG, "Connection terminated\n");
-		break;
+		return iwm_mlme_connection_terminated(iwm, buf, buf_size, cmd);
 	case WIFI_IF_NTFY_SCAN_COMPLETE:
 		return iwm_mlme_scan_complete(iwm, buf, buf_size, cmd);
 	case WIFI_IF_NTFY_STA_TABLE_CHANGE: