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ath5k negative RSSI?

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Hello!

I'm looking at the RSSI values provided by the hardware in the RX descriptor 
(rs_rssi) in ath5k. Sometimes the RSSI value is negative (-1, -2, -3) or zero 
(0), which logically does not make sense. madwifi and ath9k work around 
negative values by setting them to zero. Is this a known hardware bug? Or is 
there anything we can do in the driver to get a more reliable RSSI value?

Thanks for any insights,
Bruno
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