mac80211: Clear beacon_int in ieee80211_do_stop

This fixes stale beacon-int values that would keep a netdev
from going up.

To reproduce:

Create two VAP on one radio.
vap1 has beacon-int 100, start it.
vap2 has beacon-int 240, start it (and it will fail
  because beacon-int mismatch).
reconfigure vap2 to have beacon-int 100 and start it.
  It will fail because the stale beacon-int 240 will be used
  in the ifup path and hostapd never gets a chance to set the
  new beacon interval.

Cc: stable@vger.kernel.org
Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 5836ddeac9e34ecd2aa6e51363679d2cd11f266d..5f3c81e705c7df9ea7ff7c69eb3b6aff00df17ee 100644 (file)
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -1015,6 +1015,8 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
        if (local->open_count == 0)
                ieee80211_clear_tx_pending(local);
 
+       sdata->vif.bss_conf.beacon_int = 0;
+
        /*
         * If the interface goes down while suspended, presumably because
         * the device was unplugged and that happens before our resume,