I'm building the latest off of LEDE
$ git describe
reboot-6503-g5faa955
I'm using a QCA9984 wireless card with the ATH10K CT driver. When It boots I'm finding that the driver is spitting out the errors below. This did not happen last time I build LEDE 4 or 5 months ago. As a result the driver seems not to be getting initialized. It looks almost like the mac80211 driver is not maintaining backwards compatibility with the ath10k CT driver.
Thu Jan 1 15:20:35 1970 user.info kernel: [ 8.562425] kmodloader: loading kernel modules from /etc/modules.d/*
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.575676] ath10k_core: Unknown symbol ieee80211_connection_loss (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.582488] ath10k_core: Unknown symbol ieee80211_manage_rx_ba_offl (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.589528] ath10k_core: Unknown symbol ieee80211_txq_get_depth (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.596234] ath10k_core: Unknown symbol ieee80211_free_hw (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.602350] ath10k_core: Unknown symbol ieee80211_iterate_stations_atomic (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.609858] ath10k_core: Unknown symbol ieee80211_beacon_loss (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.616323] ath10k_core: Unknown symbol regulatory_hint (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.622266] ath10k_core: Unknown symbol ieee80211_register_hw (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.628739] ath10k_core: Unknown symbol __ieee80211_create_tpt_led_trigger (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.636332] ath10k_core: Unknown symbol ieee80211_restart_hw (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.642707] ath10k_core: Unknown symbol cfg80211_find_ie_match (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.649260] ath10k_core: Unknown symbol ieee80211_wake_queue (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.655650] ath10k_core: Unknown symbol ieee80211_find_sta (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.661843] ath10k_core: Unknown symbol ieee80211_tx_status_irqsafe (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.668829] ath10k_core: Unknown symbol ieee80211_iter_chan_contexts_atomic (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.676512] ath10k_core: Unknown symbol cfg80211_put_bss (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.682549] ath10k_core: Unknown symbol ieee80211_bss_get_ie (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.688927] ath10k_core: Unknown symbol wiphy_to_ieee80211_hw (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.695394] ath10k_core: Unknown symbol ath_reg_notifier_apply (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.701938] ath10k_core: Unknown symbol ieee80211_queue_delayed_work (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.709012] ath10k_core: Unknown symbol ieee80211_proberesp_get (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.715676] ath10k_core: Unknown symbol ieee80211_find_sta_by_ifaddr (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.722743] ath10k_core: Unknown symbol ieee80211_remain_on_channel_expired (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.730426] ath10k_core: Unknown symbol ath_is_world_regd (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.736544] ath10k_core: Unknown symbol ieee80211_get_channel (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.742997] ath10k_core: Unknown symbol ieee80211_wake_queues (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.749456] ath10k_core: Unknown symbol ieee80211_report_low_ack (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.756175] ath10k_core: Unknown symbol ieee80211_beacon_get_template (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.763322] ath10k_core: Unknown symbol ieee80211_free_txskb (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.769704] ath10k_core: Unknown symbol ieee80211_alloc_hw_nm (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.776169] ath10k_core: Unknown symbol cfg80211_get_bss (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.782196] ath10k_core: Unknown symbol ieee80211_tx_dequeue (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.788602] ath10k_core: Unknown symbol ieee80211_tx_status (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.794889] ath10k_core: Unknown symbol ieee80211_stop_queue (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.801252] ath10k_core: Unknown symbol ieee80211_ready_on_channel (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.808152] ath10k_core: Unknown symbol ieee80211_stop_queues (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.814629] ath10k_core: Unknown symbol ieee80211_vif_to_wdev (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.821086] ath10k_core: Unknown symbol ieee80211_scan_completed (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.827808] ath10k_core: Unknown symbol ieee80211_iterate_active_interfaces_atomic (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.836107] ath10k_core: Unknown symbol ieee80211_channel_to_frequency (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.843336] ath10k_core: Unknown symbol ieee80211_unregister_hw (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.849976] ath10k_core: Unknown symbol dfs_pattern_detector_init (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.856787] ath10k_core: Unknown symbol ath_regd_init (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.862540] ath10k_core: Unknown symbol ieee80211_csa_update_counter (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.869607] ath10k_core: Unknown symbol ieee80211_beacon_get_tim (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.876332] ath10k_core: Unknown symbol ieee80211_hdrlen (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.882350] ath10k_core: Unknown symbol ieee80211_radar_detected (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.889077] ath10k_core: Unknown symbol ieee80211_csa_is_complete (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.895889] ath10k_core: Unknown symbol ieee80211_queue_work (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.902269] ath10k_core: Unknown symbol cfg80211_find_vendor_ie (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.908925] ath10k_core: Unknown symbol ieee80211_csa_finish (err 0)
Thu Jan 1 15:20:35 1970 kern.warn kernel: [ 8.915297] ath10k_core: Unknown symbol ieee80211_rx_napi (err 0)
Thu Jan 1 15:20:35 1970 kern.info kernel: [ 8.955444] can: controller area network core (rev 20170425 abi 9)