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DELBA processed in workqueue too slow?

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Hi,

since all action frames are handled in the iface workqueue the following
situation can cause problems on slow devices in AP mode:

- data stream AP -> STA with established TX BA session
- peer sends a DELBA to tear the APs TX BA session down
- new frames are still send as AMPDU but the receiver doesn't BlockAck
  them anymore since it assumes the BA session is already teared down.
- DELBA gets processed

Hence, most frames between receiving the DELBA and actually processing
it are basically lost. This can easily make TCP streams getting stuck for a
few seconds :(

Any ideas?

Thanks,
Helmut
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