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[BUG] iwl4965: huge latency and errors when unblocking the hardware rfkill

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This is wireless-testing c80200cd38c265da90f0d9d031ace84aa56b0453, pulled today.

I have a Lenovo X61s with a physical rfkill switch (the kind that
slides between blocked and unblocked).

If I turn off the hardware rfkill switch (set to block) while
associated, I lose the connection (obviously).  If I turn it back on
again (set to unblock), I get a lot of latency (my mouse stops moving
for a second or two) and I sometimes get errors in the syslog like
this:

iwl4965: Error sending REPLY_CT_KILL_CONFIG_CMD: time out after 500ms.

The card fails to associate afterwards.  If I tell network-manager to
turn off wireless, then block rfkill, then wait a few seconds, then
unblock it, then turn nm back on, everything works again.

This seems like at least two different bugs:

 - iwl4965 causes latency.  This latency issue has been reproducible
every time for me on 2.6.24-ubuntu_something, 2.5.25, wireless-compat
(recent), and current wireless-testing.
 - iwl4965 doesn't work right after hard unblocking rfkill.

I'm happy to do further troubleshooting and/or test patches.

--Andy
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