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@@ -0,0 +1,374 @@
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+--- a/include/net/mac80211.h
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++++ b/include/net/mac80211.h
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+@@ -666,6 +666,9 @@ enum mac80211_rx_flags {
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+ * @mactime: value in microseconds of the 64-bit Time Synchronization Function
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+ * (TSF) timer when the first data symbol (MPDU) arrived at the hardware.
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+ * @band: the active band when this frame was received
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++ * @chains: bitmask of receive chains for which separate signal strength
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++ * values were filled.
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++ * @chain_signal: per-chain signal strength, same format as @signal
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+ * @freq: frequency the radio was tuned to when receiving this frame, in MHz
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+ * @signal: signal strength when receiving this frame, either in dBm, in dB or
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+ * unspecified depending on the hardware capabilities flags
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+@@ -679,6 +682,10 @@ enum mac80211_rx_flags {
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+ struct ieee80211_rx_status {
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+ u64 mactime;
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+ enum ieee80211_band band;
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++
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++ u8 chains;
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++ s8 chain_signal[4];
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++
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+ int freq;
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+ int signal;
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+ int antenna;
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+--- a/net/mac80211/sta_info.h
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++++ b/net/mac80211/sta_info.h
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+@@ -292,6 +292,11 @@ struct sta_info {
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+ unsigned long rx_dropped;
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+ int last_signal;
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+ struct ewma avg_signal;
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++
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++ u8 chains;
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++ s8 chain_signal_last[4];
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++ struct ewma chain_signal_avg[4];
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++
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+ /* Plus 1 for non-QoS frames */
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+ __le16 last_seq_ctrl[NUM_RX_DATA_QUEUES + 1];
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+
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+--- a/net/mac80211/rx.c
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++++ b/net/mac80211/rx.c
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+@@ -1169,6 +1169,7 @@ ieee80211_rx_h_sta_process(struct ieee80
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+ struct sk_buff *skb = rx->skb;
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+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
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+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
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++ int i;
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+
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+ if (!sta)
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+ return RX_CONTINUE;
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+@@ -1211,6 +1212,19 @@ ieee80211_rx_h_sta_process(struct ieee80
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+ sta->last_signal = status->signal;
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+ ewma_add(&sta->avg_signal, -status->signal);
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+
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++ if (status->chains) {
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++ sta->chains = status->chains;
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++ for (i = 0; i < 4; i++) {
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++ int signal = status->chain_signal[i];
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++
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++ if (!(status->chains & BIT(i)))
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++ continue;
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++
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++ sta->chain_signal_last[i] = signal;
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++ ewma_add(&sta->chain_signal_avg[i], -signal);
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++ }
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++ }
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++
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+ /*
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+ * Change STA power saving mode only at the end of a frame
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+ * exchange sequence.
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+--- a/net/mac80211/sta_info.c
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++++ b/net/mac80211/sta_info.c
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+@@ -295,6 +295,8 @@ struct sta_info *sta_info_alloc(struct i
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+ do_posix_clock_monotonic_gettime(&uptime);
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+ sta->last_connected = uptime.tv_sec;
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+ ewma_init(&sta->avg_signal, 1024, 8);
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++ for (i = 0; i < ARRAY_SIZE(sta->chain_signal_avg); i++)
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++ ewma_init(&sta->chain_signal_avg[i], 1024, 8);
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+
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+ if (sta_prepare_rate_control(local, sta, gfp)) {
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+ kfree(sta);
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+--- a/include/net/cfg80211.h
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++++ b/include/net/cfg80211.h
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+@@ -481,6 +481,8 @@ struct station_parameters {
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+ * @STATION_INFO_BSS_PARAM: @bss_param filled
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+ * @STATION_INFO_CONNECTED_TIME: @connected_time filled
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+ * @STATION_INFO_ASSOC_REQ_IES: @assoc_req_ies filled
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++ * @STATION_INFO_CHAIN_SIGNAL: @chain_signal filled
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++ * @STATION_INFO_CHAIN_SIGNAL_AVG: @chain_signal_avg filled
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+ */
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+ enum station_info_flags {
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+ STATION_INFO_INACTIVE_TIME = 1<<0,
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+@@ -500,7 +502,9 @@ enum station_info_flags {
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+ STATION_INFO_RX_BITRATE = 1<<14,
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+ STATION_INFO_BSS_PARAM = 1<<15,
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+ STATION_INFO_CONNECTED_TIME = 1<<16,
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+- STATION_INFO_ASSOC_REQ_IES = 1<<17
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++ STATION_INFO_ASSOC_REQ_IES = 1<<17,
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++ STATION_INFO_CHAIN_SIGNAL = 1<<18,
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++ STATION_INFO_CHAIN_SIGNAL_AVG = 1<<19,
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+ };
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+
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+ /**
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+@@ -580,6 +584,9 @@ struct sta_bss_parameters {
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+ * @plink_state: mesh peer link state
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+ * @signal: signal strength of last received packet in dBm
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+ * @signal_avg: signal strength average in dBm
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++ * @chains: bitmask for filled values in @chain_signal, @chain_signal_avg
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++ * @chain_signal: per-chain signal strength of last received packet in dBm
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++ * @chain_signal_avg: per-chain signal strength average in dBm
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+ * @txrate: current unicast bitrate from this station
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+ * @rxrate: current unicast bitrate to this station
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+ * @rx_packets: packets received from this station
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+@@ -609,6 +616,11 @@ struct station_info {
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+ u8 plink_state;
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+ s8 signal;
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+ s8 signal_avg;
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++
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++ u8 chains;
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++ s8 chain_signal[4];
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++ s8 chain_signal_avg[4];
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++
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+ struct rate_info txrate;
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+ struct rate_info rxrate;
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+ u32 rx_packets;
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+--- a/drivers/net/wireless/ath/ath9k/mac.h
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++++ b/drivers/net/wireless/ath/ath9k/mac.h
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+@@ -133,12 +133,8 @@ struct ath_rx_status {
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+ u8 rs_rate;
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+ u8 rs_antenna;
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+ u8 rs_more;
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+- int8_t rs_rssi_ctl0;
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+- int8_t rs_rssi_ctl1;
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+- int8_t rs_rssi_ctl2;
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+- int8_t rs_rssi_ext0;
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+- int8_t rs_rssi_ext1;
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+- int8_t rs_rssi_ext2;
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++ int8_t rs_rssi_ctl[3];
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++ int8_t rs_rssi_ext[3];
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+ u8 rs_isaggr;
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+ u8 rs_moreaggr;
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+ u8 rs_num_delims;
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+--- a/drivers/net/wireless/ath/ath9k/recv.c
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++++ b/drivers/net/wireless/ath/ath9k/recv.c
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+@@ -983,6 +983,7 @@ static int ath9k_rx_skb_preprocess(struc
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+ bool *decrypt_error)
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+ {
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+ struct ath_hw *ah = common->ah;
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++ int i, j;
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+
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+ memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
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+
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+@@ -1008,6 +1009,20 @@ static int ath9k_rx_skb_preprocess(struc
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+ rx_status->antenna = rx_stats->rs_antenna;
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+ rx_status->flag |= RX_FLAG_MACTIME_MPDU;
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+
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++ for (i = 0, j = 0; i < ARRAY_SIZE(rx_stats->rs_rssi_ctl); i++) {
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++ s8 rssi;
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++
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++ if (!(ah->rxchainmask & BIT(i)))
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++ continue;
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++
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++ rssi = rx_stats->rs_rssi_ctl[i];
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++ if (rssi != ATH9K_RSSI_BAD) {
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++ rx_status->chains |= BIT(j);
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++ rx_status->chain_signal[j] = ah->noise + rssi;
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++ }
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++ j++;
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++ }
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++
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+ return 0;
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+ }
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+
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+@@ -1538,14 +1553,14 @@ static void ath_ant_comb_scan(struct ath
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+ struct ath_ant_comb *antcomb = &sc->ant_comb;
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+ int alt_ratio = 0, alt_rssi_avg = 0, main_rssi_avg = 0, curr_alt_set;
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+ int curr_main_set;
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+- int main_rssi = rs->rs_rssi_ctl0;
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+- int alt_rssi = rs->rs_rssi_ctl1;
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++ int main_rssi = rs->rs_rssi_ctl[0];
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++ int alt_rssi = rs->rs_rssi_ctl[1];
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+ int rx_ant_conf, main_ant_conf;
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+ bool short_scan = false;
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+
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+- rx_ant_conf = (rs->rs_rssi_ctl2 >> ATH_ANT_RX_CURRENT_SHIFT) &
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++ rx_ant_conf = (rs->rs_rssi_ctl[2] >> ATH_ANT_RX_CURRENT_SHIFT) &
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+ ATH_ANT_RX_MASK;
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+- main_ant_conf = (rs->rs_rssi_ctl2 >> ATH_ANT_RX_MAIN_SHIFT) &
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++ main_ant_conf = (rs->rs_rssi_ctl[2] >> ATH_ANT_RX_MAIN_SHIFT) &
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+ ATH_ANT_RX_MASK;
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+
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+ /* Record packet only when both main_rssi and alt_rssi is positive */
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+--- a/drivers/net/wireless/ath/ath9k/ar9003_mac.c
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++++ b/drivers/net/wireless/ath/ath9k/ar9003_mac.c
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+@@ -451,12 +451,12 @@ int ath9k_hw_process_rxdesc_edma(struct
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+
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+ /* XXX: Keycache */
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+ rxs->rs_rssi = MS(rxsp->status5, AR_RxRSSICombined);
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+- rxs->rs_rssi_ctl0 = MS(rxsp->status1, AR_RxRSSIAnt00);
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+- rxs->rs_rssi_ctl1 = MS(rxsp->status1, AR_RxRSSIAnt01);
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+- rxs->rs_rssi_ctl2 = MS(rxsp->status1, AR_RxRSSIAnt02);
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+- rxs->rs_rssi_ext0 = MS(rxsp->status5, AR_RxRSSIAnt10);
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+- rxs->rs_rssi_ext1 = MS(rxsp->status5, AR_RxRSSIAnt11);
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+- rxs->rs_rssi_ext2 = MS(rxsp->status5, AR_RxRSSIAnt12);
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++ rxs->rs_rssi_ctl[0] = MS(rxsp->status1, AR_RxRSSIAnt00);
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++ rxs->rs_rssi_ctl[1] = MS(rxsp->status1, AR_RxRSSIAnt01);
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++ rxs->rs_rssi_ctl[2] = MS(rxsp->status1, AR_RxRSSIAnt02);
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++ rxs->rs_rssi_ext[0] = MS(rxsp->status5, AR_RxRSSIAnt10);
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++ rxs->rs_rssi_ext[1] = MS(rxsp->status5, AR_RxRSSIAnt11);
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++ rxs->rs_rssi_ext[2] = MS(rxsp->status5, AR_RxRSSIAnt12);
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+
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+ if (rxsp->status11 & AR_RxKeyIdxValid)
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+ rxs->rs_keyix = MS(rxsp->status11, AR_KeyIdx);
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+--- a/drivers/net/wireless/ath/ath9k/mac.c
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++++ b/drivers/net/wireless/ath/ath9k/mac.c
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+@@ -558,25 +558,25 @@ int ath9k_hw_rxprocdesc(struct ath_hw *a
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+
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+ if (ads.ds_rxstatus8 & AR_PostDelimCRCErr) {
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+ rs->rs_rssi = ATH9K_RSSI_BAD;
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+- rs->rs_rssi_ctl0 = ATH9K_RSSI_BAD;
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+- rs->rs_rssi_ctl1 = ATH9K_RSSI_BAD;
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+- rs->rs_rssi_ctl2 = ATH9K_RSSI_BAD;
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+- rs->rs_rssi_ext0 = ATH9K_RSSI_BAD;
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+- rs->rs_rssi_ext1 = ATH9K_RSSI_BAD;
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+- rs->rs_rssi_ext2 = ATH9K_RSSI_BAD;
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++ rs->rs_rssi_ctl[0] = ATH9K_RSSI_BAD;
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++ rs->rs_rssi_ctl[1] = ATH9K_RSSI_BAD;
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++ rs->rs_rssi_ctl[2] = ATH9K_RSSI_BAD;
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++ rs->rs_rssi_ext[0] = ATH9K_RSSI_BAD;
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++ rs->rs_rssi_ext[1] = ATH9K_RSSI_BAD;
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++ rs->rs_rssi_ext[2] = ATH9K_RSSI_BAD;
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+ } else {
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+ rs->rs_rssi = MS(ads.ds_rxstatus4, AR_RxRSSICombined);
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+- rs->rs_rssi_ctl0 = MS(ads.ds_rxstatus0,
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++ rs->rs_rssi_ctl[0] = MS(ads.ds_rxstatus0,
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+ AR_RxRSSIAnt00);
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+- rs->rs_rssi_ctl1 = MS(ads.ds_rxstatus0,
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++ rs->rs_rssi_ctl[1] = MS(ads.ds_rxstatus0,
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+ AR_RxRSSIAnt01);
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+- rs->rs_rssi_ctl2 = MS(ads.ds_rxstatus0,
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++ rs->rs_rssi_ctl[2] = MS(ads.ds_rxstatus0,
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+ AR_RxRSSIAnt02);
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+- rs->rs_rssi_ext0 = MS(ads.ds_rxstatus4,
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++ rs->rs_rssi_ext[0] = MS(ads.ds_rxstatus4,
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+ AR_RxRSSIAnt10);
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+- rs->rs_rssi_ext1 = MS(ads.ds_rxstatus4,
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++ rs->rs_rssi_ext[1] = MS(ads.ds_rxstatus4,
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+ AR_RxRSSIAnt11);
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+- rs->rs_rssi_ext2 = MS(ads.ds_rxstatus4,
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++ rs->rs_rssi_ext[2] = MS(ads.ds_rxstatus4,
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+ AR_RxRSSIAnt12);
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+ }
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+ if (ads.ds_rxstatus8 & AR_RxKeyIdxValid)
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+--- a/drivers/net/wireless/ath/ath9k/debug.c
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++++ b/drivers/net/wireless/ath/ath9k/debug.c
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+@@ -1032,12 +1032,12 @@ void ath_debug_stat_rx(struct ath_softc
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+
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+ spin_lock(&sc->debug.samp_lock);
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+ RX_SAMP_DBG(jiffies) = jiffies;
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+- RX_SAMP_DBG(rssi_ctl0) = rs->rs_rssi_ctl0;
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+- RX_SAMP_DBG(rssi_ctl1) = rs->rs_rssi_ctl1;
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+- RX_SAMP_DBG(rssi_ctl2) = rs->rs_rssi_ctl2;
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+- RX_SAMP_DBG(rssi_ext0) = rs->rs_rssi_ext0;
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+- RX_SAMP_DBG(rssi_ext1) = rs->rs_rssi_ext1;
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+- RX_SAMP_DBG(rssi_ext2) = rs->rs_rssi_ext2;
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++ RX_SAMP_DBG(rssi_ctl0) = rs->rs_rssi_ctl[0];
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++ RX_SAMP_DBG(rssi_ctl1) = rs->rs_rssi_ctl[1];
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++ RX_SAMP_DBG(rssi_ctl2) = rs->rs_rssi_ctl[2];
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++ RX_SAMP_DBG(rssi_ext0) = rs->rs_rssi_ext[0];
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++ RX_SAMP_DBG(rssi_ext1) = rs->rs_rssi_ext[1];
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++ RX_SAMP_DBG(rssi_ext2) = rs->rs_rssi_ext[2];
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+ RX_SAMP_DBG(antenna) = rs->rs_antenna;
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+ RX_SAMP_DBG(rssi) = rs->rs_rssi;
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+ RX_SAMP_DBG(rate) = rs->rs_rate;
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+--- a/include/linux/nl80211.h
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++++ b/include/linux/nl80211.h
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+@@ -1497,6 +1497,8 @@ enum nl80211_sta_bss_param {
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+ * @NL80211_STA_INFO_BSS_PARAM: current station's view of BSS, nested attribute
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+ * containing info as possible, see &enum nl80211_sta_bss_param
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+ * @NL80211_STA_INFO_CONNECTED_TIME: time since the station is last connected
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++ * @NL80211_STA_INFO_CHAIN_SIGNAL: per-chain signal strength of last PPDU
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++ * @NL80211_STA_INFO_CHAIN_SIGNAL_AVG: per-chain signal strength average
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+ * @__NL80211_STA_INFO_AFTER_LAST: internal
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+ * @NL80211_STA_INFO_MAX: highest possible station info attribute
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+ */
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+@@ -1518,6 +1520,8 @@ enum nl80211_sta_info {
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+ NL80211_STA_INFO_RX_BITRATE,
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+ NL80211_STA_INFO_BSS_PARAM,
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+ NL80211_STA_INFO_CONNECTED_TIME,
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++ NL80211_STA_INFO_CHAIN_SIGNAL,
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++ NL80211_STA_INFO_CHAIN_SIGNAL_AVG,
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+
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+ /* keep last */
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+ __NL80211_STA_INFO_AFTER_LAST,
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+--- a/net/wireless/nl80211.c
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++++ b/net/wireless/nl80211.c
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+@@ -2238,6 +2238,33 @@ nla_put_failure:
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+ return false;
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+ }
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+
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++static bool nl80211_put_signal(struct sk_buff *msg, u8 mask, s8 *signal,
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++ int id)
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++{
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++ void *attr;
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++ int i = 0;
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++
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++ if (!mask)
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++ return true;
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++
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++ attr = nla_nest_start(msg, id);
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++ if (!attr)
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++ goto nla_put_failure;
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++
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++ for (i = 0; i < 4; i++) {
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++ if (!(mask & BIT(i)))
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++ continue;
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++
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++ NLA_PUT_U8(msg, i, signal[i]);
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++ }
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++
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++ nla_nest_end(msg, attr);
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++
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++ return true;
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++nla_put_failure:
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++ return false;
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++}
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++
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+ static int nl80211_send_station(struct sk_buff *msg, u32 pid, u32 seq,
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+ int flags, struct net_device *dev,
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+ const u8 *mac_addr, struct station_info *sinfo)
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+@@ -2284,6 +2311,18 @@ static int nl80211_send_station(struct s
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+ if (sinfo->filled & STATION_INFO_SIGNAL_AVG)
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+ NLA_PUT_U8(msg, NL80211_STA_INFO_SIGNAL_AVG,
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+ sinfo->signal_avg);
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++ if (sinfo->filled & STATION_INFO_CHAIN_SIGNAL) {
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++ if (!nl80211_put_signal(msg, sinfo->chains,
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++ sinfo->chain_signal,
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++ NL80211_STA_INFO_CHAIN_SIGNAL))
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++ goto nla_put_failure;
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++ }
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++ if (sinfo->filled & STATION_INFO_CHAIN_SIGNAL_AVG) {
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++ if (!nl80211_put_signal(msg, sinfo->chains,
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++ sinfo->chain_signal_avg,
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++ NL80211_STA_INFO_CHAIN_SIGNAL_AVG))
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++ goto nla_put_failure;
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++ }
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+ if (sinfo->filled & STATION_INFO_TX_BITRATE) {
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+ if (!nl80211_put_sta_rate(msg, &sinfo->txrate,
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+ NL80211_STA_INFO_TX_BITRATE))
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+--- a/net/mac80211/cfg.c
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++++ b/net/mac80211/cfg.c
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+@@ -329,6 +329,7 @@ static void sta_set_sinfo(struct sta_inf
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+ {
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+ struct ieee80211_sub_if_data *sdata = sta->sdata;
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+ struct timespec uptime;
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++ int i;
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+
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+ sinfo->generation = sdata->local->sta_generation;
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+
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+@@ -363,6 +364,17 @@ static void sta_set_sinfo(struct sta_inf
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+ sinfo->signal = (s8)sta->last_signal;
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+ sinfo->signal_avg = (s8) -ewma_read(&sta->avg_signal);
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+ }
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++ if (sta->chains) {
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++ sinfo->filled |= STATION_INFO_CHAIN_SIGNAL |
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++ STATION_INFO_CHAIN_SIGNAL_AVG;
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++
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++ sinfo->chains = sta->chains;
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++ for (i = 0; i < ARRAY_SIZE(sinfo->chain_signal); i++) {
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++ sinfo->chain_signal[i] = sta->chain_signal_last[i];
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++ sinfo->chain_signal_avg[i] =
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++ (s8) -ewma_read(&sta->chain_signal_avg[i]);
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++ }
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++ }
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+
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+ sinfo->txrate.flags = 0;
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+ if (sta->last_tx_rate.flags & IEEE80211_TX_RC_MCS)
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Felix Fietkau