[PATCH] perf/arm-smmuv3: Propagate errors from optional IRQ lookup

[Bui Duc Phuc]

Hi Will,

Thank you for your review.

>
> Not sure about this. If it's optional, why should we bail the probe if
> we don't manage to get an irq? Surely it's better to continue without
> the interrupt in that case?
>

platform_get_irq_optional() returns -ENXIO when no IRQ is available.
Other negative return values indicate errors, including -EPROBE_DEFER.
In the case of -EPROBE_DEFER, we should propagate the error so that
the probe can be retried later.

Best regard,
Phuc