mac80211: inform wireless layer when frame RSSI is invalid

When the low-level driver returns an invalid RSSI indication,
set the signal value to 0 as an indication to the upper layer.

Also, skip average level computation if signal is invalid.

Signed-off-by: Jean Pierre TOSONI <jp.tosoni@acksys.fr>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index ef2becaade50..a3b1bcc2b461 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -73,7 +73,9 @@ ieee80211_bss_info_update(struct ieee80211_local *local,
         bool signal_valid;
         struct ieee80211_sub_if_data *scan_sdata;
 
-        if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
+        if (rx_status->flag & RX_FLAG_NO_SIGNAL_VAL)
+                bss_meta.signal = 0; /* invalid signal indication */
+        else if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
                 bss_meta.signal = rx_status->signal * 100;
         else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC))
                 bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal;