That's the same reason the wireless drivers didn't get merged sooner, with
the slight difference that they were waiting on the new 802.11 stack's
interface to stabilize, rather than their own interface.
On the other hand, it would be good if there were a way to include
unstable APIs in the mainline kernel so that they could get some exposure
before they're set in stone, and that would also eliminate that reason for
keeping drivers out so long.
-Daniel
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