mac80211: prevent chanctx overcommit
Do not allocate more channel contexts than a driver is capable for currently matching interface combination. This allows the ieee80211_vif_reserve_chanctx() to act as a guard against breaking interface combinations. Signed-off-by: NMichal Kazior <michal.kazior@tieto.com> Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
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