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The irq_retrigger callback is supposed to return 0 when retrigger has failed, and a non-zero value otherwise. Tell the core code that the driver has succedded in using the HW to retrigger the interrupt (if ever). Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20200310184921.23552-4-maz@kernel.org