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cfg80211: consider existing DFS interfaces

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It was possible to break interface combinations in
the following way:

 combo 1: iftype = AP, num_ifaces = 2, num_chans = 2,
 combo 2: iftype = AP, num_ifaces = 1, num_chans = 1, radar = HT20

With the above interface combinations it was
possible to:

 step 1. start AP on DFS channel by matching combo 2
 step 2. start AP on non-DFS channel by matching combo 1

This was possible beacuse (step 2) did not consider
if other interfaces require radar detection.

The patch changes how cfg80211 tracks channels -
instead of channel itself now a complete chandef
is stored.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Michal Kazior
2014-01-29 14:22:27 +01:00
committed by Johannes Berg
parent fe94f3a4ff
commit 9e0e29615a
9 changed files with 35 additions and 19 deletions
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2
net/wireless/mlme.c
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@@ -772,7 +772,7 @@ void cfg80211_cac_event(struct net_device *netdev,
if (WARN_ON(!wdev->cac_started))
return;
if (WARN_ON(!wdev->channel))
if (WARN_ON(!wdev->chandef.chan))
return;
switch (event) {