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Currently, a channel width change updates the 802.11n HT info data in net80211 but it doesn't trigger any device changes. So the device driver may decide that HT40 frames can be transmitted but the last device channel set only had HT20 set. Now, a task is scheduled so a hardware reset or change isn't done during any active ongoing RX. It also means that it's serialised with the other task operations (eg channel change.) This isn't the final incantation of this work, see below. For now, any unmodified drivers will simply receive a channel change log entry. A subsequent patch to ath(4) will introduce some basic channel change handling (by resetting the NIC.) Other NICs may need to update their rate control information. TODO: * There's still a small window at the present moment where the channel width has been updated but the task hasn't been fired. The final version of this should likely pass in a channel width field to the driver and let the driver atomically do whatever it needs to before changing the channel. PR: kern/166286
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