Because wait_event() loops are safe vs spurious wakeups we can allow the
occasional sleep -- which ends up being very similar.
Reported-by: NDave Jones <davej@codemonkey.org.uk>
Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: NDave Jones <davej@codemonkey.org.uk>
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>