[PATCH V4 4/4] mac80211: don't allow CSA on non-transmitting interfaces

[John Crispin]

As a non-transmitting interface does not broadcast a beacon, we do not want
to allow channel switch announcements. They need to be triggered on the
transmitting interface.

Signed-off-by: Aloka Dixit <alo...@codeaurora.org>
Signed-off-by: John Crispin <j...@phrozen.org>
---
 net/mac80211/cfg.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 11cecb2ed640..7693894c4f84 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -3504,6 +3504,9 @@ __ieee80211_channel_switch(struct wiphy *wiphy, struct 
net_device *dev,
        if (sdata->vif.csa_active)
                return -EBUSY;
 
+       if (sdata->vif.multiple_bssid.flags & 
IEEE80211_VIF_MBSS_NON_TRANSMITTING)
+               return -EINVAL;
+
        mutex_lock(&local->chanctx_mtx);
        conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
                                         lockdep_is_held(&local->chanctx_mtx));
-- 
2.25.1