ath(4) PATCH

[Russell Yount]

The attached patch for 8.0-STABLE enables multicast key search
capability for devices which support it in the ath(4) driver. This fixes
the problem of corrupted multicast traffic when more than one hostap
VAP is configured on a device.

You can tell if your ath(4) device supports this capability by looking
at the kernel log for "kernel: ath0: using multicast key search" as
the device is attached.

Please test if you are using the ath(4) driver. I only have AR5212 chipsets
to test with and would like to see this included in 8.0-STABLE and 9.

Thanks

-Russ
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