The reset task waits on its own polled bring-up commands. If one was
lost, nothing could complete it, and the poll panicked after ten
seconds.
Fail the controller instead. The failure path completes every
outstanding request, including the polled one, so the poll returns an
error to its caller. A polled command is only sent while the controller
is being brought up or by the passthrough ioctl, and a lost one means
the controller is not usable anyway.
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