On Tue, 20 Sep 2016, Alexandre Torgue wrote:

On 09/20/2016 02:44 PM, Thomas Gleixner wrote:

quoted

Free will be called when a interrupt in the child domain is torn down,
i.e. when irq_domain_free_irqs() is called. And it will be called for both
domains like the alloc callback is invoked on both domains via
irq_domain_alloc_irqs().

Thanks Thomas for this clarification (I'm sure now that we need .free
callbacks).
irq_domain_free_irqs() is called in 2 scenario:
1- when issue occurs in irq_create_fwspec_mapping()
2- when irq_dispose_mapping() is called

Case 2 is the one I tested some times ago. In this case, I need to mask
interrupts in .free callback of EXTI (parent) domain to avoid spurious
interrupts.

And why would irq_dispose_mapping() be called on an unmasked, i.e. active,
interrupt? The masking is just papering over that.

Thanks,

	tglx