Potential race in irq_chip_set_defaults()?

[Jeremy Fitzhardinge]

 irq_chip_set_defaults() modifies the irq_chip structure in-place when
setting up an irq.  If that happens on multiple CPUs at once then it
could leave the irq_chip structure in an inconsistent state.

Is there anything preventing that case from happening?  There's no
locking, and as far as I know there's no rule forbidding concurrent
calls to set_irq_chip()/irq_chip_set_defaults().

Thanks,
    J
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