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AP: Add more 2.4 GHz channels for 20/40 MHz HT co-ex scan

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This needs to find the PRI channel also in cases where the affected
channel is the SEC channel of a 40 MHz BSS, so need to include the
scanning coverage here to be 40 MHz from the center frequency. Without
this, it was possible to miss a neighboring 40 MHz BSS that was at the
other end of the 2.4 GHz band and had its PRI channel further away from
the local BSS.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2015-06-23 11:21:51 +03:00
parent 5ed6519625
commit 2eb5967d99
1 changed files with 7 additions and 2 deletions
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9
src/ap/hw_features.c
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@ -347,8 +347,13 @@ static void ieee80211n_scan_channels_2g4(struct hostapd_iface *iface,
sec_freq = pri_freq + 20;
else
sec_freq = pri_freq - 20;
affected_start = (pri_freq + sec_freq) / 2 - 25;
affected_end = (pri_freq + sec_freq) / 2 + 25;
/*
* Note: Need to find the PRI channel also in cases where the affected
* channel is the SEC channel of a 40 MHz BSS, so need to include the
* scanning coverage here to be 40 MHz from the center frequency.
*/
affected_start = (pri_freq + sec_freq) / 2 - 40;
affected_end = (pri_freq + sec_freq) / 2 + 40;
wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
affected_start, affected_end);