qcacld-3.0: Address race between disconnect and system suspend

A race between cfg80211 disconnect and wiphy system suspend can lead
to either DPM WD or serialization VDEV disconnect active command
timeout since scheduler thread gets suspended as part of wiphy
suspend and both cfg80211_disconnect and wiphy suspend/resume acquire
RTNL lock. To address this race condition avoid disconnect when wiphy
suspend is already completed since scheduler thread gets suspended
as part of wiphy suspend and it can't process vdev disconnect.

Change-Id: Ia7e42cffb3f6b08b33c878b68122dbdc00bad251
CRs-Fixed: 3042442

core/hdd/src/wlan_hdd_cm_disconnect.c

@@ -253,16 +253,27 @@ int wlan_hdd_cm_disconnect(struct wiphy *wiphy,
 			   struct net_device *dev, u16 reason)
 {
 	struct hdd_adapter *adapter = WLAN_HDD_GET_PRIV_PTR(dev);
+	struct hdd_context *hdd_ctx = WLAN_HDD_GET_CTX(adapter);
 	QDF_STATUS status;
+	int ret;
 
 	if (QDF_GLOBAL_FTM_MODE == hdd_get_conparam()) {
 		hdd_err("Command not allowed in FTM mode");
 		return -EINVAL;
 	}
 
+	ret = wlan_hdd_validate_context(hdd_ctx);
+	if (ret)
+		return ret;
+
 	if (wlan_hdd_validate_vdev_id(adapter->vdev_id))
 		return -EINVAL;
 
+	if (hdd_ctx->is_wiphy_suspended) {
+		hdd_info_rl("wiphy is suspended retry disconnect");
+		return -EAGAIN;
+	}
+
 	qdf_mtrace(QDF_MODULE_ID_HDD, QDF_MODULE_ID_HDD,
 		   TRACE_CODE_HDD_CFG80211_DISCONNECT,
 		   adapter->vdev_id, reason);