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    mac80211: fix CSA tx queue stopping · 59af6928
    Michal Kazior 提交于
    It was possible for tx queues to be stuck stopped
    if AP CSA finalization failed. In that case
    neither stop_ap nor do_stop woke the queues up.
    This means it was impossible to perform tx at all
    until driver was reloaded or a successful CSA was
    performed later.
    
    It was possible to solve this in a simpler manner
    however this is more robust and future proof
    (having multi-vif CSA in mind).
    
    New sdata->csa_block_tx is introduced to keep
    track of which interfaces requested tx to be
    blocked for CSA. This is required because mac80211
    stops all tx queues for that purpose. This means
    queues must be awoken only when last tx-blocking
    CSA interface is finished.
    
    It is still possible to have tx queues stopped
    after CSA failure but as soon as offending
    interfaces are stopped from userspace (stop_ap or
    ifdown) tx queues are woken up properly.
    Signed-off-by: NMichal Kazior <michal.kazior@tieto.com>
    Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
    59af6928
iface.c 46.9 KB