Re: [PATCH v2 1/3] genirq/affinity: Add irq_update_affinity_desc()

[John Garry]

Hi Thomas,

> > >    3) Interrupt has already been switched to managed. Double init is not
> > >       really a good sign either.
> > I just tested that and case 3) would be a problem. I don't see us
> > clearing the managed flag when free'ing the interrupt. So with
> > CONFIG_DEBUG_TEST_DRIVER_REMOVE=y, we attempt this affinity update
> > twice, and error from the irqd_affinity_is_managed() check.
> That means the interrupt is not deallocated and reallocated, which does
> not make sense to me.

Just mentioning a couple of things here, which could be a clue to what 
is going on:
- the device is behind mbigen secondary irq controller
- the flow in the LLDD is to allocate all 128 interrupts during probe, 
but we only register handlers for a subset with device managed API

Thanks,
John