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mac80211: ignore invalid scan RSSI values

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Channels in 2.4GHz band overlap, this means that if we
send a probe request on channel 1 and then move to channel
2, we will hear the probe response on channel 2. In this
case, the RSSI will be lower than if we had heard it on
the channel on which it was sent (1 in this case).

The scan result ignores those invalid values and the
station last signal should not be updated as well.

In case the scan determines the signal to be invalid turn on
the flag so the station last signal will not be updated with
the value and thus user space probing for NL80211_STA_INFO_SIGNAL
and NL80211_STA_INFO_SIGNAL_AVG will not get this invalid RSSI
value.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Sara Sharon 2015-06-03 10:44:17 +03:00 committed by Johannes Berg
parent d01f858c78
commit 74d803b602
1 changed files with 7 additions and 1 deletions
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8
net/mac80211/scan.c
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@ -6,7 +6,7 @@
* Copyright 2005, Devicescape Software, Inc.
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
* Copyright 2013-2014 Intel Mobile Communications GmbH
* Copyright 2013-2015 Intel Mobile Communications GmbH
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@ -69,6 +69,7 @@ ieee80211_bss_info_update(struct ieee80211_local *local,
int clen, srlen;
enum nl80211_bss_scan_width scan_width;
s32 signal = 0;
bool signal_valid;
if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
signal = rx_status->signal * 100;
@ -86,6 +87,11 @@ ieee80211_bss_info_update(struct ieee80211_local *local,
GFP_ATOMIC);
if (!cbss)
return NULL;
/* In case the signal is invalid update the status */
signal_valid = abs(channel->center_freq - cbss->channel->center_freq)
<= local->hw.wiphy->max_adj_channel_rssi_comp;
if (!signal_valid)
rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL;
bss = (void *)cbss->priv;